Universal demodulation and modulation for data communication in wireless power transfer
First Claim
1. A demodulation circuit for a wireless power transfer device, the demodulation circuit having a first, a second, and a third electrical parameter wherein one of the electrical parameters is equal to the vector sum of the other two electrical parameters, and modulation of the impedance of the demodulation circuit results in corresponding modulation of one or both of the amplitude and phase of the first electrical parameter, the corresponding modulation being determinable by detecting the amplitude of the first electrical parameter and the amplitude of the second electrical parameter, thereby demodulating data communicated by modulation of the impedance of the demodulation circuit.
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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.
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Citations
17 Claims
- 1. A demodulation circuit for a wireless power transfer device, the demodulation circuit having a first, a second, and a third electrical parameter wherein one of the electrical parameters is equal to the vector sum of the other two electrical parameters, and modulation of the impedance of the demodulation circuit results in corresponding modulation of one or both of the amplitude and phase of the first electrical parameter, the corresponding modulation being determinable by detecting the amplitude of the first electrical parameter and the amplitude of the second electrical parameter, thereby demodulating data communicated by modulation of the impedance of the demodulation circuit.
Specification