Adjustable overvoltage protected circuit for high power thyristo

Details Adjustable overvoltage protected circuit for high power thyristo Adjustable overvoltage protected circuit for high power thyristo

1976-09-22

1978-04-11

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 363 54, 363 57, H02H 320

Patent

active

040842070

ABSTRACT:
An overvoltage responsive triggering circuit for a main high power thyristor comprises a plurality of n auxiliary thyristors and electric energy storing means connected in series across said main thyristor. The auxiliary thyristors are poled to conduct forward current in the same direction as said main thyristor and have an aggregate forward breakdown voltage greater than a predetermined threshold magnitude. Said threshold magnitude is greater than the aggregate forward voltage of said n auxiliary thyristors minus the forward breakdown voltage of one of said auxiliary thyristors. Between the anode and another electrode of said one auxiliary thyristor there is connected secondary voltage breakdown means having a blocking voltage less than the forward breakdown voltage of said one auxiliary thyristor, whereby said triggering circuit becomes conductive in the breakdown mode at said threshold voltage magnitude.

REFERENCES:
patent: 3416002 (1968-12-01), Faust
patent: 3487261 (1969-12-01), Boksjo et al.
patent: 3662250 (1972-05-01), Piccone et al.
patent: 3886432 (1975-05-01), Piccone et al.
patent: 3904931 (1975-09-01), Leidich
patent: 3947726 (1976-03-01), Dececco et al.

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