GTO THYRISTOR TYPE 2 HAVING HIGH OFF-GATE GAIN

摘要

PURPOSE: To obtain a switch element capable of turning off a large current too by a micro signal by connecting the base of an initial stage transistor to the collector of a control transistor, and connecting similarly its collector to the base of the control transistor. ;CONSTITUTION: A final stage transistor 1 to burden a main current, the initial stage transistor 2 to burden an intermediate current, and the control transistor 8 to burden a small current are provided, and the base current of the final stage transistor 1 flows in the initial stage transistor 2, and the base current of the initial stage transistor flows in the control transistor 8. Since the base current of the control transistor 8 is smaller in several figures compared with the main current, considerable base resistance 4 can be put in the control transistor 8. This resistance prevents an off-gate current from being spent by a main current circuit just before turning-off, and gives high off-gate gain. Besides, this separation is attained in space or high resistance. Thus, the off-gate current is weakened so as to be as weak as an on-gate current, and the direct current of large capacity can be turned off by a micro contact even without using driving power supply.;COPYRIGHT: (C)1993,JPO&Japio