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WIRELESS CHARGING CIRCUIT, WIRELESS CHARGING SYSTEM AND SEMICONDUCTOR DEVICE

  • US 20130234658A1
  • Filed: 03/01/2013
  • Published: 09/12/2013
  • Est. Priority Date: 03/12/2012
  • Status: Active Grant
First Claim
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1. A wireless charging circuit comprising:

  • a coil antenna;

    a communication controller which can control short distance wireless communication performed via the coil antenna;

    a rectifier circuit for rectifying an alternating-current signal obtained via the coil antenna; and

    a power supply unit coupled to the rectifier circuit,wherein the power supply unit includes;

    a voltage step-down circuit for reducing voltage of output of the rectifier circuit;

    a charge control circuit for charging a battery by using the output of the voltage step-down circuit; and

    a communication controller power supply circuit for forming an operational power supply voltage of the communication controller on the basis of the output of the voltage step-down circuit,wherein the voltage step-down circuit includes;

    a switching regulator which can reduce the voltage output from the rectifier circuit;

    a selection circuit which can select an output path of the switching regulator and a bypass path for bypassing the switching regulator; and

    a selection control circuit which causes the selection circuit to select the bypass path at the time of activating the communication controller, to thereby supply voltage to the communication controller power supply circuit via the bypass path, and which causes the selection circuit to select an output path of the switching regulator after the output voltage of the switching regulator has reached a predetermined level, to thereby supply the output of the switching regulator to the communication controller power supply circuit.

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