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Universal demodulation and modulation for data communication in wireless power transfer

  • US 8,554,165 B2
  • Filed: 09/11/2012
  • Issued: 10/08/2013
  • Est. Priority Date: 09/14/2009
  • Status: Active Grant
First Claim
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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, wherein the impedance has an active part and a reactive part, a vector sum of the active and reactive parts being equal to the impedance, and wherein the communication modulator modulates one or both of the active and reactive parts to modulate one or both of the amplitude and phase of the impedance.

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