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High speed power factor controller

  • US 5,469,045 A
  • Filed: 12/07/1993
  • Issued: 11/21/1995
  • Est. Priority Date: 12/07/1993
  • Status: Expired due to Fees
First Claim
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1. A power factor correction system, comprising:

  • a voltage sensor having an input coupled across a first and second power line;

    a current sensor having an input coupled to one of said first and second power lines;

    a digital microprocessor;

    circuitry for coupling signals from said voltage sensor to said microprocessor;

    circuitry for coupling signals from said current sensor to said microprocessor;

    said microprocessor including programming means for determining a phase difference between a sensed voltage and a sensed current, and providing first, second, third and fourth switching outputs responsive to said phase difference;

    a transformer having a first winding and a second winding;

    a first and second capacitor;

    a first switching device having an input coupled to said first switching output and having a first output coupled in series with said first winding forming a first switching path, said first switching path being disposed across said power lines;

    a second switching device having an input coupled to said second switching output and having a second output coupled in series with said first winding forming a second switching path, said second switching path being disposed across said power lines;

    a third switching device having an input coupled to said third switching output and having a third output coupled in series with said first capacitor and said second winding forming a third switching path; and

    a fourth switching device having an input coupled to said fourth switching output and having a fourth output coupled in series with said second capacitor and said second winding forming a fourth switching path;

    wherein a power factor associated with said first and second power lines is corrected by selectively switching energy between magnetic and electric forms in said capacitors and said windings.

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