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Electronic appliance and power supply identification method

  • US 20080007647A1
  • Filed: 05/23/2007
  • Published: 01/10/2008
  • Est. Priority Date: 05/26/2006
  • Status: Abandoned Application
First Claim
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1. An electronic appliance that can use a secondary battery or an AC adapter as an external power supply, the electronic appliance comprising:

  • a power supply terminal commonly provided for both of a battery pack accommodating the secondary battery and the AC adapter;

    a communication terminal communicating with a control section accommodated in the battery pack when the battery pack is connected to the power supply terminal;

    an authentication processing section communicating with the control section within the battery pack through the communication terminal and supplying the voltage applied to the power supply terminal to the inside of the electronic appliance only if it is determined that the other communication party is the battery pack, which is genuine;

    a voltage comparing section comparing the voltage applied to the power supply terminal and a predetermined reference voltage; and

    a power supply determining section causing the authentication processing section to perform communication/authentication processing with the control section within the battery pack if the voltage applied to the power supply terminal is lower than the reference voltage based on the comparison result by the voltage comparing section and supplying the voltage applied to the power supply terminal to the inside of the electronic appliance without operating the authentication processing section if the voltage applied to the power supply terminal is equal to or higher than the reference voltage.

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