Power supply with improved power factor correction

Details Power supply with improved power factor correction Power supply with improved power factor correction

1990-01-09

1991-03-26

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323222, 363 89, H02M 706, G05F 170

Patent

active

050034545

ABSTRACT:
A regulated voltage converter circuit includes a storage inductor and a controlled semiconductor switch connected in series circuit to a pair of input terminals that supply a full wave rectified voltage of a sinusoidal 60 Hz AC input voltage. A power factor amplifier receives a divided part of the rectified voltage and produces an output control voltage V.sub.M of a predetermined waveform (FIG. 2c). A comparison circuit compares the control voltage V.sub.M with a ramp voltage that is proportional to the current flowing through the semiconductor switch. The comparison circuit supplies PWM pulses to a control electrode of the semiconductor switch so as to regulate the output voltage of the converter circuit. The control voltage (V.sub.M) waveform is chosen so as to produce near unity power factor correction at the input of the converter circuit.

REFERENCES:
patent: 4816982 (1989-03-01), Severinsky
patent: 4837495 (1989-06-01), Zansky
patent: 4940929 (1990-07-01), Williams

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