| 摘要 |
PROBLEM TO BE SOLVED: To reduce losses generated in a switch for an on gate by reducing a gate current value by an on gate signal, while current flowing to a GTO(gate turn-off thyristor) circuit flows in a negative direction. SOLUTION: A 1st bypass resistance 43 is connected in parallel with the switch 12a for an on gate of a wide on gate signal generation circuit 10. When an inter-gate-cathode voltage level discrimination circuit 41 discriminating the inter-gate-cathode voltage level of a GTO 7 discriminates that current flows to a diode 8 connected in opposite parallel manner to the GTP with a wide on gate command signal on, a 1st AND circuit 42 having an AND function, whose output becomes a signal making the wide on gate signal generation circuit off controls a switch for an on gate.
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