Turn-off circuit

Details Turn-off circuit Turn-off circuit

1991-11-26

1993-02-16

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363138, 318254, 318811, H02M 544

Patent

active

051876523

ABSTRACT:
In circuits with self-commutation such as, for example in inverters (4) for feeding an asynchronous machine (7), a short-time turn-off current impulse is taken from a turn-off capacitor (C1) of a turn-off or common turn-off circuit (3) for interrupting the thyristor current of the inverter. The turn-off circuit (3) connected to the direct-current side (8, 9) of the inverter (4) exhibits a first series circuit of the turn-off capacitor (C1) and a first electrical valve (T2, D2). In a branch in parallel with the turn-off capacitor (C1), a ring-around reactor (L1) with an inductance of 0.1 mH is connected in series with a second thyristor (T1). A further third thyristor (T3) is connected in antiparallel with the second thyristor (T1). A ring-around process initiated by the firing of the second thyristor (T1) is interrupted after a half period. After a freely selectable time, the third thyristor (T3) can be fired and the full resonance cycle can be concluded. As a result, the hold-off interval or minimum turn-off period for the thyristors can be achieved with a comparatively very small ring-around reactor (L1).

REFERENCES:
patent: 3887862 (1975-06-01), Hubner
patent: 4358811 (1982-11-01), Arremann

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