Reverse voltage surge protection for high-voltage thyristors

Details Reverse voltage surge protection for high-voltage thyristors Reverse voltage surge protection for high-voltage thyristors

H - Electricity

02

M

321/91

H02M 7/155 (2006.01) H02H 7/125 (2006.01) H02M 1/18 (1980.01)

Patent

CA 1056010

ABSTRACT OF THE DISCLOSURE A thyristor is shunted by a metal oxide varistor in series with switching means which switches abruptly from a normal high-resistance state to a low-resistance, current conducting state when the thyrsitor is subjected to a transient surge of reverse bias voltage the magnitude of which is higher than a predetermined repetitive peak magnitude and is nearly equal to the level at which the thyrsitor turns on in an avalanche breakdown mode. The voltage-current characteristic of the varistor is coordin- ated with the reverse breakdown characteristic of the thyristor so that surge current will divide therebetween in such proportions that the maximum reverse current flowing through the thyrsitor is lower than a predetermined critical magnitude which can damage the same, whereby the thyristor is able safely to particpate in the surge-energy dissipating process.

243980

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