Protection circuit for thyristors in an inverter in rail-bound v

Details Protection circuit for thyristors in an inverter in rail-bound v Protection circuit for thyristors in an inverter in rail-bound v

1982-06-04

1984-09-11

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 49, 363139, 361 89, H02H 7125

Patent

active

044714203

ABSTRACT:
In a protective circuit for the thyristors of an inverter circuit in a rail-bound vehicle, RC-R members are connected in parallel with the individual thyristors in order to prevent undue reverse voltages and a fuse is provided to cut off excess currents.
In order to reduce the dimensions of the thyristors the series connection of a resistor and a decoupling blocking diode is connected in parallel with each thyristor. The respective center points of these components are connected, via a breakdown diode, with the control grid of the respective thyristor, so that the secondary voltage of the inverter circuit is reduced when there is a malfunction due to excess reverse voltage and the inverter circuit is disconnected from the rail-road mains.

REFERENCES:
patent: 3678335 (1972-07-01), Pucher
patent: 3973144 (1976-08-01), Piccone
patent: 4161773 (1979-07-01), Szpakowski
Thyristoren, By K. Heumann et al., Teubner (Stuttgart, W. Germany), 3rd Ed., 1974, pp. 41, 47 and 242.

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