Damping circuit for turn-off valves

Details Damping circuit for turn-off valves Damping circuit for turn-off valves

1988-12-06

1989-12-19

Beha Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 68, 363137, H02M 106

Patent

active

048886769

ABSTRACT:
Converter inverters, such as are used in the operation of alternating current machines, have turn-off reverse-conducting GTO thyristors in the bridge arms. Parallel to each GTO thyristor there is provided a series circuit composed of a turn-off load-shedding capacitor with a turn-off load-shedding diode. The common junction points of the respective turn-off load-shedding capacitors and diodes are connected in series to a choke via at least one capacitor load-shedding diode. The inductance of the choke is 2 to 3 times as large as the inductance of the circuit. The reverse-conducting GTO thyristors are directly connected in series, without the series connection of a choke. There thus arises a damping circuit of the GTO thyristor, which is very simple and, at the same time, feed back ring-around energy.

REFERENCES:
patent: 3872372 (1975-03-01), Kautz et al.
patent: 4611276 (1986-09-01), McMurray
patent: 4639850 (1987-01-01), Asaeda et al.
patent: 4710862 (1987-12-01), Asaeda
patent: 4745513 (1988-05-01), McMurray
Electronique de Puissance, Sep. 1985, pp. 11-13.

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