Voltage converter with GTO thyristors in series connection with

Details Voltage converter with GTO thyristors in series connection with Voltage converter with GTO thyristors in series connection with

1986-07-16

1987-10-27

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 96, 307642, H02H 7122

Patent

active

047034114

ABSTRACT:
A voltage converter provided for use in power electronics, particularly as an inverter for generating alternating voltages for vehicle motors. Electric energy is supplied to the converter via direct-voltage connections (2, 3). The desired alternating voltage can be tapped off at an alternating-voltage connection (1). The alternating-voltage connection (1) is connected via at least one of series connected gate turn-off thyristors (Th1, Th2) and via at least one current limiting reactor (L1), which is connected in series with the gate turn-off thyristors to respective of the positive and negative direct-voltage connection (2, 3). Each gate turn-off thyristor is provided with a turn-off relief circuit (5). In parallel with the current limiting reactor, a reactor free-wheeling diode (D1) is connected in series with a reactor free-wheeling resistor (R1) in a free-wheeling branch. To reduce overvoltages during the turning-off of the gate turn-off thyristors, which overvoltages originate from stray inductances in the feed lines, an overvoltage capacitor is connected in parallel with these thyristors via the reactor free-wheeling diode.

REFERENCES:
patent: 3832573 (1974-08-01), Ver Planck et al.
patent: 4231083 (1980-10-01), Matsuda et al.
patent: 4384248 (1983-05-01), Matsuda et al.
patent: 4488214 (1984-12-01), Chambers
patent: 4535378 (1985-08-01), Endo

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