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AC to DC power converter with input current waveform control for buck-boost regulation of output

  • US 4,964,029 A
  • Filed: 05/18/1988
  • Issued: 10/16/1990
  • Est. Priority Date: 05/18/1988
  • Status: Expired due to Fees
First Claim
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1. An AC to DC power converter for converting AC line voltage at an input to a DC voltage at an output;

  • said converter comprising;

    rectifying means for rectifying the AC voltage;

    first switching means operated at a frequency substantially higher than the frequency of said input AC voltage for controlling the DC voltage delivered to said output;

    second switching means operated at a frequency substantially higher than the frequency of said input AC voltage for controlling the DC voltage delivered to said output;

    current sensing means for sensing the input current;

    reference waveform generating means for generating a predetermined waveform, said reference waveform generator includes storage means for storing digital data representing a predetermined waveform, wherein said storage means is addressable by address means for addressing said storage means, said address means being controlled in accordance with the frequency and phase of said input AC voltage;

    control means coupled to said current sensing means and said reference waveform generating means for controlling the operation of said first switching circuit and said second switching circuit; and

    frequency control means for providing a frequency corresponding to the frequency of said input AC voltage, said frequency control means being used to control said address means, wherein said frequency control means is a phase lock loop.

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