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Boost power supply having power factor correction circuit

  • US 4,437,146 A
  • Filed: 08/09/1982
  • Issued: 03/13/1984
  • Est. Priority Date: 08/09/1982
  • Status: Expired due to Fees
First Claim
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1. In a boost power supply having a diode-rectifying bridge, an inductor, diode and filter capacitor connector in series with said bridge, a shunting switch in parallel with the series combination of said diode and said filter capacitor, an improved power factor correction circuit comprising:

  • current-sensing means for generating a current-indicating signal indicative of the current flowing into said power supply circuit;

    reference waveform generating means producing first and second reference waveforms, each a function of a sinusoidal voltage applied to said bridge, said first reference waveform being larger than said second reference waveform by a predetermined offset voltage; and

    switch control means receiving said reference waveforms and the output of said current-sensing means for closing said shunting switch when the input current falls to said second reference waveform and for opening said shunting switch when said reference current rises to said first reference waveform.

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