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Wireless power system and proximity effects

  • US 9,124,120 B2
  • Filed: 06/10/2008
  • Issued: 09/01/2015
  • Est. Priority Date: 06/11/2007
  • Status: Active Grant
First Claim
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1. A wireless power reception system, comprising:

  • a receiver coil disposed about a perimeter of a mobile device; and

    a wireless power receiver circuit coupled to the receiver coil, the wireless power receiver circuit and the receiver coil configured to receive power via a wireless field at a first frequency, the received wireless power sufficient to charge or power a load, the wireless power receiver circuit and the receiver coil having an inductance and a capacitance such that the wireless power receiver circuit and the receiver coil are configured to resonate at a resonant frequency that is substantially equal to the first frequency, the receiver coil having a ferrite-less core being resistant to degradation of a resonant condition of the receiver coil and the wireless power receiver circuit from permanent magnets in the mobile device.

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