AC to DC converter having an enhanced power factor

Details AC to DC converter having an enhanced power factor AC to DC converter having an enhanced power factor

1992-03-11

1993-01-19

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 46, 323222, H02M 7217, G05F 170, G05F 1613

Patent

active

051811596

ABSTRACT:
The invention relates to an AC to DC converter having an improved power factor achieved by combining boost converter operation at the beginning and ending of each half wave of the AC input waveform, with passive operation at the middle portion of each half wave. The timing of the operation is based on comparing the instantaneous voltage with a stored average voltage, which has the effect of making boost converter operation go off at a fixed angle after the beginning of each half wave and go on at a fixed angle before the ending of each half wave, the angles being independent of the average AC voltage. The converter increases the power factor to a value between 90 and 97% and reduces the current waveform distortion to between 15 and 29%.

REFERENCES:
patent: 4677366 (1987-06-01), Wilkinson
patent: 4688162 (1987-08-01), Mutch
patent: 4940929 (1990-07-01), Williams
J. E. Murray and D. C. Griffith, "The Live Driven Switches as a Block Box Load", PCI Oct. 1985 Proceedings.
Francisc C. Schwarz, "A Time-Domain Analysis of the Power Factor for a Rectifier Filter System with Over- and Subcritical Inductance", IEEE Transactions on Industrial Electronics and Control Instrumentation, May 1973.
I. Barbi and S. A. Oliveria da Silva, "Sinusoidal Live Current Rectification at Unity Power Factor with Boost Quasi Resonant Computers" 1990 IEEE.

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