Apparatus for monitoring the state of charge of a battery

  • US 4,968,941 A
  • Filed: 07/13/1988
  • Issued: 11/06/1990
  • Est. Priority Date: 07/13/1988
  • Status: Expired due to Term
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First Claim
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1. An apparatus for monitoring the state of charge of a battery comprising:

  • a shunt resistor to be placed in series with said battery and having a voltage drop related to the current to or from said battery;

    and an electrical long term analog integrator connected across said shunt resistor for integrating said voltage drop;

    said integrator comprising an operational amplifier, an input resistor connected in series to a first input of said operational amplifier, and a MEMORIODE connected in series between said first input and the output of said operational amplifier;

    said MEMORIODE being operatively connected for non-volatile storage of said monitored state of charge without requiring connection of said apparatus, said integrator, or said MEMORIODE to said battery or other source of power.

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