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WIRELESS CHARGING CIRCUIT AND ABNORMAL STATE PROTECTION CIRCUIT THEREOF

  • US 20150061604A1
  • Filed: 07/02/2014
  • Published: 03/05/2015
  • Est. Priority Date: 08/30/2013
  • Status: Active Grant
First Claim
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1. A wireless charging circuit, comprising:

  • a power converter, receiving an input voltage, for outputting a pulse width modulation signal;

    a resonant circuit, comprising an input terminal, a resonant terminal and a common voltage terminal, wherein the input terminal of the resonant circuit receives the pulse width modulation signal, and the common voltage terminal of the resonant circuit is coupled to a common voltage;

    an abnormal state protection circuit, comprising;

    a DC sampling circuit, coupled to the resonant terminal of the resonant circuit, for sampling a DC component of a voltage of the resonant terminal of the resonant circuit to obtain a DC voltage; and

    a control circuit, coupled to the power converter and the DC sampling circuit, receiving the DC voltage,wherein the control circuit controls the power converter to reduce a current inputted to the resonant circuit when the DC voltage is greater than a threshold voltage.

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