Apparatus and method for measuring battery condition

  • US 4,697,134 A
  • Filed: 07/31/1986
  • Issued: 09/29/1987
  • Est. Priority Date: 07/31/1986
  • Status: Expired due to Term
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First Claim
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1. A battery monitor comprising:

  • a. an AC signal generator adapted to generate an AC signal at a selected frequency;

    b. means for applying the AC signal across a first pair of contacts of a battery;

    c. means for determining first and second Ohms-law-related parameters indicative of impedance across a second pair of contacts of the battery, said determining means comprising;

    first means for supplying a first input signal indicative of the first Ohms-law-related parameter;

    first filter means coupled to the first supplying means for passing components of the first input signal at the selected frequency and for attenuating at least components of the first input signal in a first attenuation frequency range greater than the selected frequency, said filter means operating to generate a first filtered output signal; and

    first means for measuring said first filtered output signal to determine said first Ohms-law-related parameter.

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