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Method and apparatus for charging batteries

  • US 7,202,636 B2
  • Filed: 08/10/2004
  • Issued: 04/10/2007
  • Est. Priority Date: 08/10/2004
  • Status: Active Grant
First Claim
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1. A battery charger, comprising:

  • an input circuit configured to receive an ac input having a period of T seconds and to provide a first dc signal;

    a converter configured to receive the first dc signal and to provide a converter output across a dc bus having a peak voltage of V volts, and configured to receive at least one control input;

    an output circuit configured to receive the dc signal and to provide a battery charging signal having a power of P watts;

    a controller, including a power factor correction circuit, configured to provide at least one control signal to the converter; and

    a bus capacitor connected across the dc bus wherein the bus capacitor has a capacitance of at least (3PT)/(V2) farads.

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