Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1979-08-16
1981-08-25
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
H02M 7515
Patent
active
042863171
ABSTRACT:
With forced commutation static power or current converters having extinguishing or interruption circuit connected to the individual power switching branches and employing controllable extinguishing or turnoff valves, there exists the problem of unsymmetrical voltage build-up in the extinguishing circuits with corresponding overload or overdimensioning of the extinguishing valves, also referred to as commutation valves. This problem is solved, according to the invention, by arranging the usual commutation capacitor between the power switching branches, i.e., the load circuits, and the extinguishing valves, i.e., the commutation valves, and by arranging a damping circuit between the commutation capacitor and the extinguishing valves. The damping circuit is connected, by special valves, with positive and negative limiting potential. The undesired non-symmetry is thus effectively reduced.
REFERENCES:
patent: 3313999 (1967-04-01), Jewett
patent: 3932798 (1976-01-01), Chalmers et al.
Etz-A, Bd. 90 (1969), H.14, pp. 353-357, (German Article).
Vde-Buchreihe, Bd. 11, pp. 135-150, Vde-Verlag Berlin, 1966, (German Article) .
BBC Brown Boveri & Co. Ltd.
Beha Jr. William H.
Kleeman Werner W.
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