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Foreign object detector, power transmitter, power receiver, and wireless power transmission system

  • US 10,020,692 B2
  • Filed: 03/05/2014
  • Issued: 07/10/2018
  • Est. Priority Date: 03/05/2014
  • Status: Active Grant
First Claim
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1. A foreign object detector, comprising:

  • an oscillator circuit having a coil and a resonant capacitor, wherein the oscillator circuit outputs a voltage which includes an AC component and a DC component, the AC component having a positive cycle and a negative cycle; and

    an electric circuit that detects a variation of the AC component and a variation of the DC component in the voltage output from the oscillator circuit when a foreign object approaches the coil,whereinthe coil also functions as a power transmitting coil for transmitting electric power wirelessly,the foreign object detector further includes a switch coupled to the oscillator circuit, andthe switch electrically connects the coil to other elements of the oscillator circuit in a foreign object detection mode and to electrically separate the coil from the other elements of the oscillator circuit in a power transmission mode.

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