Gate signal generator for thyristor valve

Details Gate signal generator for thyristor valve Gate signal generator for thyristor valve

1988-07-08

1989-08-22

Zazworsky, John

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307643, 323210, 363 54, 03K 1772, 03K 1708, H03K 1772, H03K 1708

Patent

active

048598844

ABSTRACT:
A gate signal generator comprises U- and X-phase set circuits for discriminating, after the conduction period of every cycle, whether OFF time intervals of U- and X-phase thyristors are greater or smaller than a predetermined value, a reset circuit for detecting that both the U- and X-phase circuits do not provide outputs, a flip-flop set in response to an output from the U- or X-phase set circuit and reset in response to an output from the reset circuit, AND gates for calculating AND products of an output from the flip-flop and U- and X-phase forward voltage signals and for outputting the signals at a start of the forward voltage application after setting the flip-flop, and OR gates for calculating OR sums of outputs from the AND gates and outputs from the normal gate circuits. Gate signals are applied to the thyristors in response to the outputs from the OR gates.

REFERENCES:
patent: 3936726 (1976-02-01), Kelley, Jr.
patent: 4260948 (1981-04-01), Okado
patent: 4298810 (1981-03-01), Dinger et al.

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