Method and apparatus for charging a battery

  • US 6,081,098 A
  • Filed: 11/03/1997
  • Issued: 06/27/2000
  • Est. Priority Date: 11/03/1997
  • Status: Expired due to Term
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First Claim
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1. An apparatus for charging a lead acid storage battery, comprising:

  • a first electrical connector adapted to connect to a positive terminal of the battery;

    a second electrical connector adapted to connect to a negative terminal of the battery;

    an electrical charging source providing a charge signal to the first and second connectors, the charge signal sufficiently large to charge the battery, wherein the charge signal includes an AC signal component;

    voltage measurement circuitry coupled to the first and second electrical connectors responsively providing sensed voltage output related to the AC signal component of the charge signal;

    current measurement circuitry coupled to the first electrical connector responsively providing a sensed current output related to the AC signal component of the charge signal; and

    state of charge measurement circuitry responsively providing a state of charge output as a function of a parameter of the lead acid storage determined as a ratio of the sensed voltage output and the sensed current output, the state of charge output related to the amount the battery is charged.

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