Universal Demodulation and Modulation for Data Communication in Wireless Power Transfer
First Claim
1. A modulation circuit for a wireless power transfer device, the modulation circuit having a communication modulator to modulate the impedance of the modulation circuit thereby to communicate data, the communication modulator selected to modulate the impedance to a predetermined minimum modulation depth.
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Abstract
The present invention provides a universal demodulation circuit, a load modulation circuit and associated method, and an associated power transfer system, all suitable for use in wireless power transfer. A power receiver with signal strength detection is also provided. Modulation of the impedance of the demodulation circuit is determinable by detecting the amplitudes of a first and a second electrical parameter, thereby demodulating data communicated by modulation of the impedance of the demodulation circuit. The modulation circuit has a communication modulator to modulate the impedance of the modulation circuit, to a predetermined minimum modulation depth, thereby to communicate data.
22 Citations
30 Claims
- 1. A modulation circuit for a wireless power transfer device, the modulation circuit having a communication modulator to modulate the impedance of the modulation circuit thereby to communicate data, the communication modulator selected to modulate the impedance to a predetermined minimum modulation depth.
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16. A method of modulating the impedance of a modulation circuit to communicate data, the method including:
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determining the capacity of a communication modulator such that the communication modulator can modulate the impedance to a predetermined minimum modulation depth; providing the modulation circuit with the communication modulator, such that the impedance of the modulation circuit can be modulated with the communication modulator, thereby to communicate data. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification