Thyristor driver turn-off circuit

Details Thyristor driver turn-off circuit Thyristor driver turn-off circuit

1986-10-16

1989-10-24

Shoop, Jr., William M.

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

363 96, 307646, F21V 3300

Patent

active

048764680

ABSTRACT:
A gate drive circuit for a thyristor has a power supply and an amplifier for supplying current to a gate electrode of the thyristor. A timing signal is generated to initiate conduction of the thyristor. A voltage level signal is generated in response to a voltage from cathode to anode of the thyristor to indicate a reduction in the cathode to anode voltage of the thyristor when the voltage is reduced by conduction of the thyristor. Current is supplied to the gate electrode of the thyristor in response to the timing signal, and current ceases to flow to the gate electrode of the thyristor at a predetermined time interval following generation of the voltage level signal indicative of a collapse in cathode to anode voltage of the thyristor caused by conduction of the thyristor, and the predetermined time interval is chosen to be of sufficient duration to permit conduction of the thyristor to reach a stable value before current flow to the gate electrode of the thyristor substantially ceases.

REFERENCES:
patent: 3457430 (1969-07-01), Samuelson
patent: 3728557 (1973-04-01), Pelly et al.
patent: 4298810 (1981-11-01), Dinger et al.
patent: 4417156 (1983-11-01), Fukui et al.

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