Low-loss and low-reactive power switching relief device for the

Details Low-loss and low-reactive power switching relief device for the Low-loss and low-reactive power switching relief device for the

1989-03-21

1990-05-08

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 96, 363138, H02H 7122, H02M 7515

Patent

active

049243705

ABSTRACT:
A low-loss and low-reactive power switching relief circuit has an inverter output section coupled at its upper and lower ends to the positive or negative potential of a DC voltage source, respectively. The coupling is via saturable stepping choke coils. A wiring network serves as a switching relief for the semiconductor switches of each inverter phase. A circuit having a switching-off relief capacitor, two storage capacitors and two switching-off relief diodes causes uniform switching-off relief. A circuit having two current rate of rise limiting choke coils and four feedback diodes causes uniform switching-on relief of the upper and lower semiconductor switches, respectively. By means of the stepping choke coils, the output section and the wiring network are temporarily decoupled from the DC voltage source during the switching-on process of one of the semiconductor switches. This occurs in such a manner that the interim-stored trapped energy is fed into the load nearly without loss and any reactive power.

REFERENCES:
patent: 4611267 (1986-09-01), McMurray
patent: 4691270 (1987-09-01), Pruitt
Klemens Heumann and Rainer Marquardt, "GTO-Thyristoren in Selbstgefuhrten Stromrichtern", Electrotechnische Zeitschrift, vol. 104 (1983) No. 718, pp. 328-322.

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