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Battery charger and charge control method

  • US 7,714,532 B2
  • Filed: 06/29/2004
  • Issued: 05/11/2010
  • Est. Priority Date: 07/14/2003
  • Status: Expired due to Fees
First Claim
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1. A battery charger for controlling the length of time for charging a secondary battery with a timer circuit, comprising:

  • discriminating means for discriminating whether a battery set in charging position is a primary battery or a secondary battery;

    a time constant means for setting the length of charging time by means of a time constant; and

    a timer having a time constant switching means for switching the time constant,wherein the time constant switching means switches the time constant to shorten the length of charging time, when the battery is judged a primary battery, to charge the primary battery.

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