COLLECTOR FOLLOWER-TYPE TRANSISTORIZED VOLTAGE REGULATOR WITH THERMISTOR STARTING CIRCUIT

摘要

In a transistorized voltage regulator, in which a voltage source is connected to an emitter input circuit of a regulating transistor and a load to its collector output circuit, the starting circuit consists of a thermistor having a positive resistance-temperature coefficient connected between the emitter input circuit and the base of the regulating transistor. The thermistor supplies a starting current to the regulating transistor at the starting moment when an operating voltage is applied to the emitter input circuit of the transistor. On the other hand, since it is heated by an electric current flowing therethrough and has a high resistance at a high temperature the thermistor is substantially electrically isolated from the voltage regulator in the normal operation of the transistor. Thus, a regulator effectively operating even in a low-level load current is obtained.