Battery state of charge gauge

  • US 3,946,299 A
  • Filed: 02/11/1975
  • Issued: 03/23/1976
  • Est. Priority Date: 02/11/1975
  • Status: Expired due to Term
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First Claim
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1. Circuitry for measuring the usable energy present in an electric battery comprising, in combination, means for producing a first signal proportional to battery current, means responsive to a feedback signal for generating a second signal simulating the internal resistance of the battery, means for muliplying said first and second signals to produce a product signal, means for adding a signal related to the battery terminal voltage to said product signal thereby to produce an output signal, said output signal being coupled to said generating means to serve as said feedback signal, whereby the level of said output signal is a measure of the state of charge of the battery.

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