Switching processes in alloyed pin rectifiers

Abstract A theory for the switching of power rectifiers from forward to reverse state is derived, and confirmed by measurements. In cases interesting especially in application, one may confine oneself to strong injection in the forward state, and to strong reverse currents during the switching process. Under these circumstances, the reverse voltage is built up during the switching by the space charges of the flowing off charge carriers. The following results, which contradict a conception frequently voiced, may be pointed out: ( a ) The flowing off of the charge carriers is not limited by “reverse-biased” doping junctions. ( b ) For that reason, the duration of the switching process is not determined by the finite carrier lifetime if the sweeping out current is strong enough. It follows from the theory that during switching processes the rectifier can be destroyed by essentially smaller voltages than by those it resists under stationary conditions.