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System for charging/monitoring batteries for a microprocessor based system

  • US 5,432,429 A
  • Filed: 10/23/1990
  • Issued: 07/11/1995
  • Est. Priority Date: 10/23/1990
  • Status: Expired due to Fees
First Claim
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1. A battery control/monitor circuit for interfacing with a main battery having a positive voltage terminal connected to a user variable external load, comprising:

  • storage circuitry for storing both battery status information indicating the charge state of the main battery and externally generated control information, and having an input port for receiving said externally generated control information from external to the battery control/monitor circuit, and the status information accessible external to the control/monitor circuit;

    said storage circuitry operable to store an initial charge state value as said battery status information representing an initial charge state for the main battery;

    a current sensor for measuring current flow from the positive voltage terminal of the main battery to the external load;

    an integrator having an integrator output for integrating the measured current flow over time to provide a determination of energy flow from the positive terminal of the main battery and for generating a representation of the integrated measured current on the integrator output;

    an accumulator for accumulating the charge flow determined by said integrator from the time said initial charge state value is stored in said storage circuitry;

    a termination device for terminating the accumulation operation of said accumulator when the voltage of the main battery falls below a predetermined voltage;

    update circuitry for changing the value of said initial charge state stored in said storage circuitry by the value in said integrating device to provide a measure of accumulated charge flow at the positive voltage terminal of the main battery indicating the capacity of the main battery for the external load; and

    system control circuitry for controlling the operation of said integrator in accordance with said control information stored in said storage circuitry.

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