A fast acting protection circuit for transistorised voltage regulators using series control elements
Uma Shanker Singh, G. N. Acharya · Proceedings of the Indian Division of the Institution of Electronic and Radio Engineers/Proceedings · 1966
Protection of the control element against overload conditions is one of the major requirements of transistorised voltage regulators. Overload of any kind can cause catastrophic damage in a matter of microseconds to transistors and possibly to other semi-conducting devices used in such units and, to be of any value, protective gear must act almost instantaneously.The use of a silicon controlled rectifier (S.C.R.) offers an interesting possibility for the solution of this problem. The design of a novel protection circuit using an S.C.R. and a sensing transistor is discussed and results obtained with a typical voltage regulator circuit using a fast acting S.C.R. protection unit are presented.