Zero point detector for an optically controllable thyristor

Details Zero point detector for an optically controllable thyristor Zero point detector for an optically controllable thyristor

1990-07-10

1991-12-10

Zazworsky, John

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307305, 307311, 307647, 307354, H03K 1772, H03K 1778

Patent

active

050721437

ABSTRACT:
A thyristor is controlled by a phototransistor whose photo current is reduced by a MOSFET if the thyristor voltage surpasses a prescribed value. The MOSFET is controlled by two current supplies. The first current supply is connected between a gate terminal and a connecting terminal of the thyristor. The second current supply is connected between the gate and source of the MOSFET. The maximum current capacity of the first current supply is greater than the maximum current capacity of the second current supply.

REFERENCES:
patent: 4158150 (1979-06-01), Dever
patent: 4578595 (1986-03-01), Tihanyi et al.
patent: 4578596 (1986-03-01), Tihanyi et al.
patent: 4697097 (1987-09-01), Rusznyak

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