Power converter with improved control of its main switches, and

Details Power converter with improved control of its main switches, and Power converter with improved control of its main switches, and

1997-12-29

2000-04-04

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 58, 363 98, H02H 7122, H02M 324, H02M 7521

Patent

active

06046920&

ABSTRACT:
A power converter having two main switches connecting an outlet either to a positive rail or to a negative rail, two free-wheel diodes enabling the current through the load to be maintained, two snubber capacitors, and an auxiliary circuit. The auxiliary circuit includes an auxiliary inductor in series with two auxiliary switches coupled between the outlet and a midpoint of a capacitive voltage divider that provides a midpoint voltage. A detector detects current oscillation between the auxiliary inductor and the snubber capacitors, and then switches off the oscillation current and allows the intended main switch to conduct in response to the interruption.

REFERENCES:
patent: 3207974 (1965-09-01), McMurray
patent: 3935528 (1976-01-01), Brenneisen et al.
patent: 4471421 (1984-09-01), Brown et al.
patent: 4482946 (1984-11-01), Bhagwat
patent: 5107412 (1992-04-01), Fuchs
patent: 5121317 (1992-06-01), Vogler
patent: 5150287 (1992-09-01), Gruning
Mok et al, "Control Complexities Related to High Power Resonant Inverters", PESC96 Record, vol. 2, Jun. 24-27, 1996, Lago Maggiore, Italy, pp. 1040-1046.
W. McMurray, "Resonant Snubbers with Auxiliary Swithces", IEEE Transactions On Industry Applications, vol. 29, No. 2, Mar. 1, 1993, pp. 355-361.
G. A. Fisher, "High power transistor inverters-potential for single device operation at 1000 A and 800V", Proceedings 16th Universities Power Engineering Conference (UPEC) 1981, Sheffield, GB.

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