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Battery-powered electronic equipment with charge control circuit

  • US 7,336,053 B2
  • Filed: 03/30/2004
  • Issued: 02/26/2008
  • Est. Priority Date: 03/31/2003
  • Status: Active Grant
First Claim
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1. An electric equipment comprising:

  • a battery;

    an electric condenser that has an internal resistance lower than that of the battery and accumulates therein an electric power of the battery;

    a charge control circuit that controls a charge current originating from the electric power of the battery and flowing from the battery to the electric condenser; and

    a load driven with the electric power accumulated in the electric condenser;

    wherein the charge control circuit controls the charge current in accordance with a self-discharge rate of the battery so that a battery voltage drop developed across the battery falls within a range of 5 to 20% of a battery voltage when the battery is in an open state.

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