Device for determining the charge condition of a battery

  • US 5,144,218 A
  • Filed: 11/13/1990
  • Issued: 09/01/1992
  • Est. Priority Date: 10/25/1989
  • Status: Expired due to Fees
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First Claim
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1. A device for determining the charge condition of a battery comprising:

  • a current-frequency converter, including means for sensing a current flow through the battery, for generating pulses at a frequency which is dependent on the current flowing through the battery;

    computing means for determining a computed relative charge condition of the battery by counting the number of converter pulses generated; and

    indicator means for indicating the computed charge condition as a fraction of the capacity of the battery,detection means for detecting at least one actual relative charge condition of the battery when it is being charged or discharged; and

    correction means, including means for comparing the actual relative charge condition with the computed relative charge condition, for adjusting the computed relative charge condition when the detected actual relative charge condition deviates from the computed relative charge condition, said correction means being adapted to modify the number of pulses needed to represent a predetermined variation of the computed relative charge condition of the battery.

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