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Battery charge control circuit

  • US 6,031,357 A
  • Filed: 04/13/1999
  • Issued: 02/29/2000
  • Est. Priority Date: 04/28/1998
  • Status: Expired due to Term
First Claim
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1. A battery charge control circuit for charging a battery by variably adjusting a current of an output transistor provided between a line terminal and an output terminal to which a battery is connected based on a difference in voltage between a voltage of a power supply and a voltage of the output terminal, the battery charge control circuit comprising:

  • a first transistor that is cut off when the voltage of the output terminal is lower than a voltage of the line terminal and closed when it is not; and

    a second transistor that closes to supply an actuating current to a circuit that generates a constant voltage when the first transistor is cut off.

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