Electronic battery tester with very high noise immunity

  • US 5,598,098 A
  • Filed: 08/11/1994
  • Issued: 01/28/1997
  • Est. Priority Date: 08/11/1994
  • Status: Expired due to Fees
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First Claim
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1. An electronic circuit with an output signal containing a component proportional to an element of conductance of an electrochemical cell or battery comprising:

  • high-gain amplifier means including power amplifying output means providing said output signal;

    internal feedback means, including logic-controlled switch means and holding capacitor means, said internal feedback means coupling said output signal to the input of said high-gain amplifier means and said holding capacitor means instantaneously following said output signal when said logic-controlled switch means is in a first state, said internal feedback means not coupling said output signal to said input of said high-gain amplifier means and said holding capacitor means storing a fixed voltage when said logic-controlled switch means is in a second state;

    external feedback means, including feedback resistor means, coupling said output signal to said electrochemical cell or battery;

    voltage sourcing means providing logic-selectable discrete voltage levels;

    capacitive coupling means coupling the series combination of said electrochemical cell or battery and said voltage sourcing means to said input of said high-gain amplifier means; and

    ,timing means coupled to said logic-controlled switch means and to said voltage sourcing means, said timing means directing said voltage sourcing means to periodically step-change between said discrete voltage levels, and also directing said logic-controlled switch means to assume said second state immediately before said step-change and to assume said first state at a given time after said step-change.

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