Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-05-07
1977-09-20
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307252N, 307252W, 323 18, 323 22SC, 323 24, 323 39, H03K 1772
Patent
active
040499766
ABSTRACT:
A circuit for switching a voltage between a pair of terminals by means of a thyristor, preferably a silicon controlled rectifier (SCR), connected at its anode to one of the terminals and at its cathode to the other terminal, is characterized by a control switch connected with a normally open contact thereof between the gate and the anode of the SCR, and with a normally closed contact controlling the voltage at the gate of the SCR. With the control switch in its normal or "off" condition, the SCR is nonconductive and the voltage at the gate thereof is controlled independently to adjust the voltage at which the SCR would be turned on by a rapidly increasing voltage between the terminals, i.e., to adjust its dv/dt withstand capability. With the switch in its "on" condition, the gate is disconnected from control voltage and connected to the anode of the SCR, thereby to minimize the gate current required to render the SCR conductive.
In one embodiment, the normally closed contact is connected directly between the gate and the cathode of the SCR. In another embodiment, the normally closed contact is connected between the gate and a separately controlled source of biasing voltage.
To switch an a.c. voltage, the circuit may be connected with a full wave rectifier, or a pair of the circuits may be connected between the terminals, each for conducting an opposite half cycle of the a.c. voltage.
REFERENCES:
patent: 3189759 (1965-06-01), Laishley
patent: 3271700 (1966-09-01), Gutzwiller
patent: 3275855 (1966-09-01), Wright
patent: 3287571 (1966-11-01), White
patent: 3546488 (1970-12-01), Motto, Jr.
Koranye, T. D., Power Supply Switch, IBM Technical Disclosure Bulletin, vol. 10, No. 8, Jan. 1968, pp. 1138-1139.
Rasco Marcus S.
Zazworsky John
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