Method and apparatus to trigger the current-conducting state of

Details Method and apparatus to trigger the current-conducting state of Method and apparatus to trigger the current-conducting state of

1985-02-15

1987-10-06

Zazworsky, John

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307268, 307305, 307639, 323239, 323246, H03K 1772

Patent

active

046985204

ABSTRACT:
A method and apparatus to maintain the current-conducting state of a gate-turn-off thyristor by appropriate triggering. To maintain the thyristor's current-conducting state reliably and with little ignition energy consumed, a comparator signal is generated as soon as the voltage drop across the thyristor exceeds a preset limit value by a comparator stage. The comparator signal has a preset duration defined by a pulse duration limiting stage, and, if necessary, a subsequent pulse magnitude limiting stage can change the pulse magnitude as a function of the interval between two subsequent ignition current pulses. A controllable current source connected to the thyristor gate is controlled by these magnitude and duration limited pulses, but this controlled current source only triggers the thyristor when the limit value is exceeded.

REFERENCES:
patent: 3728557 (1973-04-01), Pelly et al.
patent: 3821630 (1974-06-01), Kornrumpf et al.
patent: 4417156 (1983-11-01), Fukui et al.
patent: 4456836 (1984-06-01), Matsuda et al.
8095 IEEE Transactions on Industry Applications vol. IA-19 (1983) May-Jun., No. 3, Part 1, New York, USA, "Development of PWM Inverter Employing GTO"--Matsuda et al.

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