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Circuit and method for adjusting safety time-out with charge current

  • US 7,560,899 B1
  • Filed: 12/15/2004
  • Issued: 07/14/2009
  • Est. Priority Date: 12/15/2004
  • Status: Active Grant
First Claim
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1. A circuit for charging a battery, comprising:

  • a power pass circuit that is arranged to receive a power source voltage and to provide a regulated charge current in response to the power source voltage and a control voltage;

    a sense circuit that is arranged to receive the charge current and to provide a sense signal in response to the charge current;

    a charge current control circuit that is arranged to receive the sense signal and to provide the control voltage based on the sense signal;

    a timer control circuit that is arranged to provide a timer control signal with a frequency that is based, in part, on the sense signal; and

    a safety timer circuit that is arranged to deactivate and reactivate the charge current control circuit based on the timer control signal and to detect an amount of charging time based on the frequency of the timer control signal.

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