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Method of modulating wireless power transmission signal

  • US 9,825,672 B2
  • Filed: 12/13/2011
  • Issued: 11/21/2017
  • Est. Priority Date: 12/13/2011
  • Status: Active Grant
First Claim
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1. A wireless power transmission system, comprising:

  • a power conversion unit that is configured to form a wireless power signal based on a carrier signal;

    a modulation unit that is configured to modulate the wireless power signal so as to include a packet in the wireless power signal;

    a wireless power receiver; and

    a controller that is configured to control the modulation unit to modulate the wireless power signal by adjusting an operating frequency of the carrier signal, and control the power conversion unit to transmit the modulated wireless power signal to the wireless power receiver,wherein the adjustment of the operating frequency is carried out in a manner of selecting a signal from two or more signals having different frequencies as a carrier signal, the selected signal having a frequency corresponding to data included in the packet,wherein the two or more signals has a resonant frequency for resonance coupling with the wireless power receiver and at least one frequency within a predetermined frequency range from the resonant frequency,wherein the two or more signals at the resonant frequency and the at least one frequency within the predetermined frequency range indicates a first data value and a second data value which is different from the first data value respectively,wherein the number (2n) of modulation frequency of the two or more signals is the same as the number of bits (2n) per symbol transferred to the wireless power receiver,wherein the wireless power receiver demodulates the two or more signals with one frequency which is the resonant frequency and obtains different amplitudes as a degree differently changed from the resonant frequency, andwherein the number of modulation frequency is determined from the number of bits per symbol transferred to the wireless power receiver, and a resolution of amplitude difference with which the wireless power receiver is capable of demodulating the two or more signals by an amplitude demodulation.

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