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Battery protection circuit

  • US 6,992,463 B2
  • Filed: 11/16/2004
  • Issued: 01/31/2006
  • Est. Priority Date: 11/21/2003
  • Status: Active Grant
First Claim
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1. A battery protection circuit used to control the operation of a first switch circuit and a second switch circuit inserted in series in a power supply path between battery cells and an external power source, comprising a first protecting controller, having an interface circuit for receiving a command signal output from a controller monitoring whether the voltage of the battery cells is higher than a first voltage, and generating a control signal for controlling operation of the first switch circuit,a second protecting controller, having an over-voltage detector that detects whether the voltage of the battery cells is higher than a second voltage or higher than the first voltage, and generating a control signal for controlling the operation of the first switch circuit and a second control signal for controlling the turning off of the second switch circuit;

  • wherein, when the over-voltage detector of the second protecting controller detects that the voltage of the battery cells is higher than said second voltage, a control signal for turning off the first switch circuit is generated;

    then, when the voltage of the battery cells remains higher than the second voltage after a prescribed time, the second control signal is generated for turning off the second switch circuit.

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