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High power factor switching-type battery charger

  • US 4,472,672 A
  • Filed: 12/13/1982
  • Issued: 09/18/1984
  • Est. Priority Date: 12/13/1982
  • Status: Expired due to Fees
First Claim
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1. An improved switching-type charging circuit operated from an AC power source for charging a battery wherein the operating power factor is optimized and further wherein the charging circuit includes a pulse width modulation circuit controlling a switching transistor together with a current sensing means, said charging circuit including in combination:

  • an electronically variable sinusoidal voltage reference means coupled to the AC input means;

    a D.C. voltage reference means for generating a reference voltage related to the battery voltage and temperature;

    a first feedback loop responsive to said current sensing means and said D.C. voltage reference means for controlling said electronically variable sinusoidal voltage reference means; and

    a second feedback loop means responsive to said current sense means and said electronically variable voltage reference means for controlling said pulse width modulation circuit.

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