| 摘要 |
PURPOSE:To decrease the number of parts and the circuit loss and provide the high-speed response by a method wherein turn-off use limiting voltage of GTO thyristor is made equal to or greater than voltage between anode and cathode of the GTO thyristor at use state. CONSTITUTION:In V-1 characteristics of safety operation limiting region in high- current region, turn-off use limiting voltage VDRM is determined by voltage at intersection of current with zero axis and clamp voltage VAK is determined by voltage applied between anode and cathode in GTO cycle when the fall time is ended and the anode voltage comes to the steady state. Then VDRM>=VAK. By using the GTO cycle having the use limiting voltage VDRM equal to the clamp voltage VAK or more, large controllable current can be obtained even omitting a snubber circuit. |
