Snubber circuit for GTO thyristor

Details Snubber circuit for GTO thyristor Snubber circuit for GTO thyristor

1986-04-29

1987-07-07

Zazworsky, John

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307305, H03K 1772

Patent

active

046789324

ABSTRACT:
A snubber circuit for a GTO thyristor including a series-connected member of a capacitor and a diode connected in parallel with a GTO thyristor and a series-connected member of a resistor and a thyristor connected in parallel with the diode. The thyristor is adapted to be turned on when the GTO thyristor is turned on and the thyristor is adapted to be turned off at the same time as or immediately after a turn off of the GTO thyristor, whereby the circuit is enabled to perform the same protecting function as that of a snubber circuit for a GTO thyristor which includes no thyristor and, further, to block a discharging current from the capacitor due to the ripple voltages produced across the GTO thyristor after its turn off, by means of the thyristor which is then in an off state, so that no current may flow through the resistor.

REFERENCES:
patent: 3299297 (1967-01-01), Motto, Jr.
patent: 3532901 (1970-10-01), Cavallius et al.
patent: 3641364 (1972-02-01), Rippel
patent: 4392175 (1983-07-01), Takigami et al.
Ohashi, "Snubber Circuit for High-Power Gate Turn-Off Thyristors", Jul.-Aug., 1983, pp. 655-664.
Mitsubishi Denki Giho, "Application of GTO in Vehicle Propelling Control System", vol. 58, No. 12, 1984.
IPEC Tokyo, "Computation Method", International Power Electronics Conference, Conference Record, vol. 1, pp. 76-77; Mar. 1983.

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