Automatic voltage imbalance detector

  • US 4,424,491 A
  • Filed: 05/20/1981
  • Issued: 01/03/1984
  • Est. Priority Date: 05/20/1981
  • Status: Expired due to Fees
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First Claim
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1. A device for indicating malfunction of at least one voltage cell in a plurality of voltage cells connected in series comprising:

  • means for adding the voltage magnitudes of two adjacent voltage cells of said plurality of voltage cells connected in series at upper and lower voltage points to obtain a sum voltage;

    means for comparing said sum voltage with a central voltage between said two adjacent voltage cells to obtain an error voltage proportional to the difference between said sum voltage and said central voltage; and

    switching means for providing an output whenever said error voltage exceeds a predetermined magnitude indicative of a malfunction of at least one of said voltage cells, said switching means having a first transistor connected to conduct whenever said error signal exceeds a predetermined positive voltage and a second transistor connected to conduct whenever said error signal exceeds a predetermined negative voltage.

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