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State of battery charge indicator circuit

  • US 4,258,306 A
  • Filed: 09/19/1978
  • Issued: 03/24/1981
  • Est. Priority Date: 09/19/1978
  • Status: Expired due to Term
First Claim
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1. In a circuit for indicating the actual state of charge of a storage battery including means for providing a first signal proportional to battery current, means for producing a second signal proportional to the internal resistance of the battery at its actual state of charge, means for providing a third signal proportional to the actual terminal voltage of the battery, means for combining said signals to produce an output signal proportional to the actual state of charge, and converting means for converting the output signal to an indication of the actual state of charge of the battery, the improvement comprising:

  • disabling means for preventing the converting means from indicating an increase in the state of charge during use of the battery as a power source.

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