Witricity - Wireless Electricity - Wireless Energy Transfer - Seminar Report

   

     

    

  

 

  



                       –      









 

  







                      

               

            

         



                                     



 

















     

  

                           

                

 –            

         

    

   

   

   

 –          

      

 –     

    









  



                         

 Nikola Tesla’s Wardenclyffe Tower (Tesla Tower)          Tesla’s Wireless Bulb              

                        



 





                                           ever, Newton’s gravitational law, Watt’s steam engine, Thomson’s bulb and many more. But a                                     Today, as we can see the word ‘wireless’ is common in day –  –                                                                         

   

                                                                “W ”                         

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In the late 1800’s and early 1900’s, at the dawn of the electrification of the modern world,                                                                                                                                                                                                                 arin Soljačić                            

    ’                                  

                                                                        



   





                                              earth’s magnetic field are examples of objects having  

 

                                                                                   “capture” some portion of that                                    

                          

                  —                                                                                                                                                                                                                                            Christian Oersted’s discovery of magnetic field around a                                                      

  





                                                                                                         

                     

              …

                



                                              cas letter “e” for voltage.        

                                                                                                                                                ge: e = N(dΦ/dt)                                                                                                                                 Ω, the intensity  oscillations I when the system is driven with a driving frequency ω   

           systems. Γ                                                    

                                                                                                                                                                       λ  

  f = v/λ 

                                                                                                                        

                                                                                                                                                                                            

                               



   

   



 

                

 

                                   

 



   

                                                                           

 

                                          

   

                                                                                                         ’s Wireless Bulb

                                                           



  

                                                             

                           

    

                                                                                                                                     

                                                   

    





                         

                                               

 

  

 

                                                            

 

     one at the ‘sender end’ and one at ‘receiver end’. The   

                                               

 

                                                 

 

 

                                                                                         

  

   

   

   

   

 

               

    



 

 

      

Where ω1, 2 are the individual frequencies, Γ1, 2 are the Resonance widths (Decay rates) due to he objects’ intrinsic (absorption, radiation etc.) losses, and ‘κ’ is the coupling coefficient             ω1=ω2 and Γ1=Γ2  normal modes of the combined system are split by 2κ.    ween the two objects takes place in time Pi/κ and is nearly  loss rates (κ>> Γ1, 2).  {κ /sqrt (Γ1, 2)}             

The desired optimal regime {κ/sqrt (Γ1,2)>>1} is called “Strong Coupling” regime. There is No change in Energy, unless κ/Γ



 

 

                                                 

 

 



  





                     sending coil (or “primary winding”) induces another current in a receiving coil (or “secondary winding”). The two coils must be very close together, and may even overlap, but the coils do not                                   “charging pads” which require that the object being charged be placed directly on top of, or very                                                                                 





                                                                                       receiver by “cranking  power”               “Directed radiation”,                                      

                                                                    



  

 machines use “magnetic resonance imaging”           “Resonant  Coupling” must                                                “resonance”   in “MRI”                                                                                                                      



    



                                                                                      power consumption to a power saving “idle” state.

                                              concrete are essentially “transparent” to magnetic fields—   

               “wrap around” many metallic obstacles that might otherwise block the magnetic fields.              





           —  —                  “The body really          

 

                    technology doesn’t give rise to radio                                       





                                                  technology operates in a “load following” mode, 

                                      



                                 



   

                           —       —                              technology is designed for Original Equipment Manufacturers (OEM’s) to embed 

      

Reduce product failure rates by fixing the ‘weakest link’:     

Use efficient electric ‘grid power’ directly instead of inefficient battery charging.



            hotspots … while devices are in use and mobile.        screen TV’s, digital picture             unsightly cables and “wallwart” power supplies.              etc… eliminating disposable batteries and a 



            “joints” (robots, packaging machinery, assembly machinery, machine tools) …           underwater, etc.) … where it is impractical or impossible to                   



                           



   

             



 

                                    –                                               



 

                         An article published in the Science Magazine as “Wireless Power Transfer via Strongly Coupled Magnetic Resonances” by Andre kurs, Science 317,      “Efficient NonRadiative Midrange Energy Transfer” by Aristeidies karalis, Marlin        F. Valone, “Tesla’ s Wireless Energy... For the 21  Direct TV!!!”   James O. McSpadden, “Wireless Power Transmission Demonstration”, Texas A&M   rych Arthur (Setauket, NY), “System and method for wireless electrical power transmission”,    Joe T. Howell, et. al , “Advanced receiver / converter experiments for laser wireless power transmission”        