Advancements in Wireless Power (Energy Transfer)

Advancements in Wirelesss Pow Wireles ower er Haleem Azmy Bhuwan Ghimire Andrew R McHugh

Thank You MIT Dr. Palmer and Dr. Stumpe

What are we doing?

Giler, Eric. "Eric Giler demos wireless w ireless electricit electricityy | Video on TED.com." TED.com." TED: Ideas worth spreading. N.p., n.d. Web. 2 Dec. 2009. .

What are we doing?

Whyy is this Important? Wh Important? •

More efficient than More batteries1, and no more batteries in landfills

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No tangled wires

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Automatic charging

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Less gasoline

1. Giler, Giler, Eric. "Eric Giler Gi ler demos de mos wireless wirel ess electricit e lectricityy | Video on TED.com." TED.com." TED: Ideas worth spreading. N.p., n.d. Web. 2 Dec. 2009. .

When was wireless power first discovered?

When was wireless power first discovered?

1800’s

Theory

Resonance Inductance

Resonance

Resonance

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Resonance

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Resonance

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Resonance ♩

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Resonance ♩

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Resonance ♩

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Faraday’s Law of  Induction (1800’s)

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Resonance

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Strongly Coupled, Magnetically Resonant Coils

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Strongly Coupled, Magnetically Resonant Coils

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Strongly Coupled, Magnetically Resonant Coils

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Strongly Coupled, Magnetically Resonant Coils

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♩

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Strongly Coupled, Magnetically Resonant Coils

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Strongly Coupled, Magnetically Resonant Coils

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Why Our Experiment is Different •

Midrange power transfer

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Resonance is key

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Safe r than Tesla Safer Tesla coils

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Interference is essentially nonexistent

Our Experiment

Equipment Needed •

Two self resonating coils (made out of magnet wire)

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A source of alternating current

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Oscilloscope

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Laws of Physics

What’s all this in pseudo-simple language? •

Works on princip principle le of Wireless Power Transfer Via Stronglyy “Coupled Magnetic Resonances” Strongl

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A.C. in the driving coil makes it oscillate at a certain cer tain frequency creating an alternating magnetic field

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This generated magnetic field will transfer power to the receiving coil by oscillating at the same frequency. This is known as a coupled resonance and is the principle behind this technique of wireless power.

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A.C. will be induced in the receiving coil, which can be read by an oscilloscope.

Distance vs. Induced RMS Voltage 6.000

4.500

   )    V    (   e   g   a    t    l   o    V    S3.000    M    R    d   e   c   u    d   n    I 1.500

0 0

0.500

1.000

1.500

2.000

Distance (m)

2.500

3.000

3.500

Distance vs. Induced RMS Power 0.75000

0.60000

   )    W    (   r   e   w0.45000   o    P    S    M    R    d 0.30000   e   c   u    d   n    I 0.15000

0 0

0.500

1.000

1.500

2.000

Distance (m)

2.500

3.000

3.500

Frequency vs. Induced RMS Voltage 6.000

5.000

   )    V    ( 4.000   e   g   a    t    l   o    V    S3.000    M    R    d   e   c   u    d 2.000   n    I

1.000

0 0

2.000

4.000

6.000

8.000

10.000

12.000

Frequency (MHz)

14.000

16.000

18.000

20.000

Frequency vs. Induced RMS Power 0.50000

0.37500

   )    W    (   r   e   w   o    P    d 0.25000   e   c   u    d   n    I    S    M    R 0.12500

0 0

2.000

4.000

6.000

8.000

10.000

12.000

Frequency (MHz)

14.000

16.000

18.000

20.000

Frequency vs. Induced RMS Power LOG SCALE

0.10000

   )    W    (   r   e   w0.01000   o    P    d   e   c   u    d   n 0.00100    I    S    M    R 0.00010

0.00001 0

2.000

4.000

6.000

8.000

10.000

12.000

Frequency (MHz)

14.000

16.000

18.000

20.000

RMS Voltage Voltage vs. vs . Induced Induced RMS Voltage 15.00 y = 2.9204x - 0.0387 R² = 0.9999

11.25

   )    V    (   e   g   a    t    l   o    V    S 7.50    M    R    d   e   c   u    d   n    I 3.75

0 0

1.00

2.00

RMS Voltage (V)

3.00

4.00

RMS Voltage vs. Induced RMS Power 2.000 y = 0.1448x2 - 0.0126x + 0.0045 R² = 0.9999

1.500

   )    W    (   r   e   w   o    P    d 1.000   e   c   u    d   n    I    S    M    R 0.500

0 0

1.00

2.00

RMS Voltage (V)

3.00

4.00

Future

Problems •

Hallway data

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Reading errors

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Manufacturing troubles

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Over our heads

Future Studies •

Couple the coils differently

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Multiple receiving coils

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Accurately measure magnetic field

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Use a stronger function generator

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Change coil geometry

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Try different interference i nterference

Question and Answ Question Answer er Period