Electronic battery tester

  • US 6,806,716 B2
  • Filed: 01/29/2004
  • Issued: 10/19/2004
  • Est. Priority Date: 04/08/1999
  • Status: Expired due to Fees
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First Claim
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1. An electronic battery tester for testing a battery comprising:

  • a source configured to apply a signal to terminals of the battery through first and second connections of a Kelvin connection to the battery;

    a differential amplifier having an inverting input, a non-inverting input and a difference input;

    a first capacitor and a first resistor configured to couple a first terminal of the battery to the inverting input of the differential amplifier and thereby form a third connection at the Kelvin connection;

    a second capacitor and a second resistor configured to couple a second terminal of the battery to the non-inverting input of the differential amplifier and thereby form a fourth connection of the Kelvin connection;

    an electrical connection between the differential output and the inverting input of the amplifier which includes a third resistor;

    a fourth resistor electrically connected to the non-inverting input differential;

    an analog to digital converter coupled to the differential output of differential amplifier;

    a microprocessor configured to determine a condition of the battery as a function of an output of the analog to digital converter in response to the signal applied to the battery by the source.

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