Turn-off switch phase control with improved ripple and power fac

Details Turn-off switch phase control with improved ripple and power fac Turn-off switch phase control with improved ripple and power fac

1992-01-03

1993-03-30

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 37, 363 45, 363160, 323207, H02M 5257

Patent

active

051989727

ABSTRACT:
An improved commutation arrangement for an AC to AC or AC to DC energy converter circuit is disclosed. The improved arrangement uses turn-off capable commutation switches to enable modification of the operating waveforms in the cycloconverter. The modified waveforms include an operating concept wherein in lieu of always switching to the next lagging phase (as is done with conventional cycloconverters), an intervening switch is made to the leading phase when the output voltage is less than one-half of the maximum value. The disclosure includes mathematical consideration of source machine power factor, output waveform ripple content, interphase transformer characteristics, engine starting usage, and other refinements of the commutation arrangement.

REFERENCES:
patent: 4218732 (1980-08-01), Lafuze
patent: 4567552 (1986-01-01), Hirose
patent: 4589059 (1986-05-01), Tanino
patent: 4648022 (1987-03-01), Schauder
patent: 4777581 (1988-10-01), Smith
patent: 4814967 (1989-03-01), Broughton et al.
patent: 4833588 (1989-05-01), Schauder
Textbook, Rectifier Circuits: Theory and Design by Johannes Schaefer, published by John Wiley and Sons in 1965.

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