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Feed unit, feed system, and electronic device

  • US 9,960,627 B2
  • Filed: 12/11/2012
  • Issued: 05/01/2018
  • Est. Priority Date: 12/21/2011
  • Status: Active Grant
First Claim
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1. A feed unit, comprising:

  • a power transmission coil configured to transmit power, via a magnetic field or an electric field, to a device including a secondary battery; and

    a power-transmission control circuit configured to control power transmission operation of the power transmission coil, whereinthe power-transmission control circuit controls, when the device is in a charging period and the load of the device is activated, the power transmission coil to increase the power transmitted to the device by achieving a power value necessary in the activation of the load according to a request from the device, andthe power-transmission control circuit controls, when the device is in the charging period and the load of the device is not activated, to increase or decrease by one step the transmitted power based on whether or not the request indicates one step down.

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