Circuit arrangement for firing controlled, parallel-connected el

Details Circuit arrangement for firing controlled, parallel-connected el Circuit arrangement for firing controlled, parallel-connected el

1976-05-06

1977-12-13

Pellinen, A. D.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

307252L, H02M 108

Patent

active

040631451

ABSTRACT:
Apparatus for firing the thyristors or valves in parallel connected first and second valve branches. More particularly, a firing device is provided for providing firing pulses to at least a first valve in the first valve branch. A refiring device is provided which includes a transformer for determining the difference in the current carried by the first valve and a second valve adjacent thereto in the second valve branch. The latter refiring device also comprises a threshold member which, when the current difference determined by the transformer exceeds a predetermined value, causes the one of the first and second valves carrying the lesser current to receive firing pulses.

REFERENCES:
patent: 2572648 (1951-10-01), Mittag
patent: 3218476 (1965-11-01), Hansson
patent: 3670236 (1972-06-01), Ekstrom
patent: 3904950 (1975-09-01), Judd et al.
patent: 3913000 (1975-10-01), Cardwell
patent: 3938026 (1976-02-01), Hoffmann et al.
patent: 3986103 (1976-10-01), Frankenberg et al.

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