Switching circuit for high-voltage thyristors

Details Switching circuit for high-voltage thyristors Switching circuit for high-voltage thyristors

1979-03-14

1981-04-28

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307311, 323326, H03K 1772

Patent

active

042648300

ABSTRACT:
To turn a thyristor, particularly a high-voltage thyristor, ON, and to connect the thyristor and the utilization circuit to a power source, a charge capacitor is connected to a charging circuit to charge the capacitor when the thyristor is blocked or in OFF state. A controlled switch, typically a transistor 20, is connected to the charge capacitor 19 and connects the charge capacitor to the gate electrode of the thyristor, when the controlled switch is turned ON; a control circuit is connected to the controlled switch which includes an opto-coupler 28 to control its conduction. Preferably, a threshold sensitive element such as a Zener diode 25, or a four-layer diode 30, is included in the controlled switch transistor base circuit to provide for sharp turn-on characteristics. Since the conduction characteristics of the controlled switching transistor 20 will depend on the charge state of the capacitor 19, the controlled switching transistor will be conductive only when the capacitor has a sufficiently high charge for reliable firing of the thyristor.

REFERENCES:
patent: 3673437 (1972-06-01), Wright
patent: 3848140 (1974-11-01), Guermeur et al.
patent: 3932770 (1976-01-01), Fantozzi
patent: 3967138 (1976-06-01), Mitsuoka et al.

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