Battery tester using internal resistance to measure a condition of a battery

  • US 6,384,608 B1
  • Filed: 03/13/2001
  • Issued: 05/07/2002
  • Est. Priority Date: 03/13/2001
  • Status: Expired due to Fees
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First Claim
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1. Method of measuring a condition of a battery using a measure of the internal resistance thereof comprising the steps of:

  • inducing an AC signal across the terminals of the battery by applying an AC current load thereto;

    measuring the induced AC signal and converting it to a first voltage potential signal which is a measure of the battery'"'"'s internal resistance;

    applying the first voltage potential signal across a voltage divider network calibrated in accordance with a predetermined battery rating scale to render a multiplicity of second voltage potential signals at a corresponding multiplicity of taps along the voltage divider network, values of said second voltage potential signals being representative of the calibrated battery rating scale; and

    sequentially selecting the second voltage potential signals along the taps for comparison with a threshold voltage potential signal to determine a measure of the condition of the battery.

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