Thyristor voltage switching circuits

Details Thyristor voltage switching circuits Thyristor voltage switching circuits

1976-09-17

1978-02-21

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

361 56, H03K 1772, H03K 1708

Patent

active

040755100

ABSTRACT:
Improved thyristor voltage switching circuits for connecting an a.c. voltage across a load are characterized by means for protecting the thyristors when in the off state against line voltage transients of an amplitude in excess of breakdown voltages thereof.
In one embodiment of the invention, the thyristors are triacs connected in series to increase their overall voltage withstand capability. In another embodiment, circuitry is connected to sense the voltage between anode and cathode terminals of triacs, and to apply a signal to gate terminals thereof to render the triacs conductive whenever the anode to cathode voltage is in excess of the breakdown voltage. In this manner, surge currents are conducted across the entire junction areas of the triacs as compared with point areas, and destruction of the triacs is prevented.

REFERENCES:
patent: 3360713 (1967-12-01), Howell
patent: 4006367 (1977-02-01), Ott

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