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Battery protector

  • US 5,581,170 A
  • Filed: 08/08/1995
  • Issued: 12/03/1996
  • Est. Priority Date: 12/12/1994
  • Status: Expired due to Term
First Claim
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1. A battery protection device for protecting at least one battery cell adapted for being charged by a battery charger and for delivering power to a load, said battery protection device comprising:

  • a voltage detection and comparison circuit having a plurality of input terminals adapted for coupling across said at least one cell and providing an overvoltage signal indicative of whether or not the voltage across one of said at least one cell is greater than an overvoltage threshold level or an undervoltage signal indicative of whether or not the voltage across said one cell is less than an undervoltage threshold level; and

    a current carrying FET having a first terminal adapted for connection to said at least one cell, a second terminal adapted for connection to said charger and said load, a gate terminal responsive to said overvoltage signal or said undervoltage signal, and a back gate terminal adapted for selective connection to either said first or second terminal of said current carrying FET to prevent current flow through a body diode of said current carrying FET.

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