Circuitry and method of protecting thyristors

Details Circuitry and method of protecting thyristors Circuitry and method of protecting thyristors

1990-08-14

1992-05-19

Skudy, R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 58, 363 87, H02M 7757

Patent

active

051153874

ABSTRACT:
There is disclosed a method for detecting thyristor conduction using voltage sensing means (400) rather than prior art current sensing means (112). Circuitry for protecting back-to-back thyristor bridges (300) is also disclosed having two levels of protection. One level comprises circuitry (540) for detecting firing commands to the bridges. When such commands to one bridge are detected, the circuitry is operative to prevent the transmission of firing commands to the other bridge. The other level of protection comprises circuitry (400) for detecting conduction by any thyristor in the bridges (300). When conduction by a thyristor in one bridge is detected, the bridge conduction detection circuitry is operative to prevent the transmission of firing commands to the other bridge.

REFERENCES:
patent: 3654541 (1972-04-01), Kelly, Jr.
patent: 4366427 (1982-12-01), Walker et al.
patent: 4394606 (1983-07-01), Woerwag
patent: 4459528 (1984-07-01), Nola
patent: 4475150 (1984-10-01), D'Atre et al.
patent: 4527109 (1985-07-01), Hosokawa
patent: 4796142 (1989-01-01), Libert

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