Various kind of control method to rectifier application are used. And for high speed and automatic control, electronic complicated circuits are used ordinarily. In this paper, propose a simplified circuit for above purposes, in which monostable vibrator are used suitably. Generally a monostable vibrator is used for obtaining a certain width pulse. Then, of course, differentiating this pulse, can be taken out a new delay pulse. And some times this new delay pulses are used for gate control. Now, as you know, this delay time can be controlled easily changing the circuit constant of monostable vibrator or supplied voltage to this circuits by which pulse width can be varied. And so, especial device for pulse shift control such as sowtooth generator, voltage comparater are not necesary and circuits become simpler than existing systems. Apply this method to S.C.R. power constant control and obtain good result effectively in spite of large fluctiations of A.C. voltage.
