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Wireless communication device

  • US 8,159,193 B2
  • Filed: 12/19/2007
  • Issued: 04/17/2012
  • Est. Priority Date: 12/26/2006
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising:

  • an antenna;

    a first AC/DC converter circuit electrically connected to the antenna;

    a second AC/DC converter circuit electrically connected to the antenna through a first switching element;

    a second switching element electrically connected to the antenna through an electrical element;

    a battery electrically connected to the second AC/DC converter circuit through a charge controller circuit and configured to store electric power supplied from the antenna;

    a first detecting circuit configured to control operation of the first switching element in accordance with a value of a voltage output from the first AC/DC converter circuit and to control operation of the second switching element in accordance with the voltage output from the first AC/DC converter circuit and a charging state of the battery;

    a third switching element electrically connected to the battery; and

    a second detecting circuit configured to control operation of the third switching element in accordance with the voltage output from the first AC/DC converter circuit.

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