Wireless inductive power transfer
First Claim
1. A power transmitter for wirelessly providing power to a power receiver using an inductive power signal;
- the power transmitter comprising;
a variable resonance circuit for generating the inductive power signal in response to a drive signal, the variable resonance circuit having a resonance frequency being a variable resonance frequency;
a driver for generating the drive signal for the variable resonance circuit, the drive signal having an operating frequency;
a load modulation receiver for demodulating load modulation of the inductive power signal by the power receiver and for generating a demodulation quality measure; and
an adaptor for adapting the operating frequency and the resonance frequency to converge, the adaptation of the operating frequency and the resonance frequency further being in response to the demodulation quality measure.
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Accused Products
Abstract
A wireless power transfer system includes a power receiver and a power transmitter providing power to this using an inductive power signal. The power transmitter comprises a variable resonance circuit (201) having a variable resonance frequency and generating the inductive power signal. A driver (203) generates the drive signal and a load modulation receiver (303) demodulates load modulation of the inductive power signal. An adaptor (305) adapts the operating frequency and the resonance frequency to converge, and specifically is arranged to control the operating frequency and the resonance frequency to be substantially the same. The adaptation of the operating frequency and the resonance frequency is further in response to a demodulation quality measure. The invention may allow improved communication, and in particular may reduce intermodulation distortion.
3 Citations
18 Claims
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1. A power transmitter for wirelessly providing power to a power receiver using an inductive power signal;
- the power transmitter comprising;
a variable resonance circuit for generating the inductive power signal in response to a drive signal, the variable resonance circuit having a resonance frequency being a variable resonance frequency; a driver for generating the drive signal for the variable resonance circuit, the drive signal having an operating frequency; a load modulation receiver for demodulating load modulation of the inductive power signal by the power receiver and for generating a demodulation quality measure; and an adaptor for adapting the operating frequency and the resonance frequency to converge, the adaptation of the operating frequency and the resonance frequency further being in response to the demodulation quality measure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- the power transmitter comprising;
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15. A method of operation for a power transmitter for wirelessly providing power to a power receiver using an inductive power signal, the power transmitter comprising a variable resonance circuit for generating the inductive power signal in response to a drive signal, the variable resonance circuit having a resonance frequency being a variable resonance frequency;
- the method comprising;
generating the drive signal for the variable resonance circuit, the drive signal having an operating frequency; demodulating load modulation of the inductive power signal by the power receiver; generating a demodulation quality measure; and adapting the operating frequency and the resonance frequency to converge, the adaptation of the operating frequency and the resonance frequency further being in response to the demodulation quality measure.
- the method comprising;
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16. A wireless power transfer system including a power receiver and a power transmitter for wirelessly providing power to the power receiver using an inductive power signal;
- the power transmitter comprising;
a variable resonance circuit for generating the inductive power signal in response to a drive signal, the variable resonance circuit having a resonance frequency being a variable resonance frequency; a driver for generating the drive signal for the variable resonance circuit, the drive signal having an operating frequency; a load modulation receiver for demodulating load modulation of the inductive power signal by the power receiver and for generating a demodulation quality measure; and an adaptor for adapting the operating frequency and the resonance frequency to converge, the adaptation of the operating frequency and the resonance frequency further being in response to a demodulation quality measure. - View Dependent Claims (17, 18)
- the power transmitter comprising;
Specification