| 摘要 |
PURPOSE:To balance currents flowing to GTOs at turn-off by using two gate turn-off thyristors GTOs in pairs and arranging a turn-off snubber circuit at the middle of both GTOs. CONSTITUTION:The titled circuit consists of two GTO modules connected in parallel. Anodes and cathodes of the GTO modules are connected by copper bus bars 2a, 2b and the snubber circuit, especially a snubber diode 4 and a snubber capacitor 5 in the turn-off snubber circuit are provided between the bus bars 2a and 2b so as to be placed summetrically (inbetween both modules) with respect to a line segment A-A. Thus, the wiring impedance of the snubber circuit is equal, and the currents iS1, iS2 flowing from both GTOs to the snubber circuit through commutation are balanced, then anode currents iA1, iA2 are also balanced and the locus comprising the anode current iA and the anode-cathode voltage VAK is kept.
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