Device for maintaining the cut-off switching state of a thyristo

Details Device for maintaining the cut-off switching state of a thyristo Device for maintaining the cut-off switching state of a thyristo

1987-08-10

1989-08-01

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 57, 307633, H02H 7125

Patent

active

048538345

ABSTRACT:
For maintaining the current-blocking switching state of a thyristor that can be turned off, a low-resistance shunt is added between the gate and cathode terminal of the thyristor in the event of a fault, i.e., in case of a failure of the blocking negative gate- cathode voltage. The shunt preferably is a self-conducting field-effect transistor which is kept in the cut-off state, at least with the thyristor turned off by the negative thyristor gate-cathode voltage itself or indirectly by a supply voltage causing this voltage. The drain-source path of the transistor is connected in series with a diode having a low forward voltage in order to prevent undesirable inverse operation of the transistor.

REFERENCES:
patent: 3891866 (1975-06-01), Okuhara et al.
patent: 4117350 (1978-09-01), Kalfus et al.
patent: 4417156 (1983-11-01), Fukui et al.

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