Abnormal battery cell voltage detection circuitry

  • US 5,302,902 A
  • Filed: 04/26/1991
  • Issued: 04/12/1994
  • Est. Priority Date: 04/26/1991
  • Status: Expired due to Fees
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First Claim
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1. An apparatus for monitoring a defective condition of a battery having a plurality of cells, the improvement comprising:

  • means for referencing each battery cell to a common ground while generating a control signal when the voltage output from at least one battery cell becomes abnormal due to the defective condition; and

    transistor arranged in cooperating groups of three with each said group including a pair of bipolar junction transistors and a field effect transistor, each said bipolar junction transistor being controlled at a gate terminal;

    each said cooperating group of three transistors having said field effect transistor connected therein to pass current from the battery and having said control signal applied therein to the base terminal of one transistor in said bipolar junction transistor pair, while the gate terminal of said field effect transistor therein is driven by the other transistor in said bipolar junction transistor pair to control the current passing through said field effect transistor.

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