DISPOSITIVO DE PROTECCION DE UN TRANSISTOR DE POTENCIA PARA CONSTITUIR EL VARIADOR DE VELOCIDAD DE UN MOTOR ELECTRICO.

摘要

A control circuit (5) to whose control input (V+) the voltage (Vc) at the pick-off of a potentiometer (Pc) is supplied, is used to protect a power transistor (T2) via which a DC motor (1) is supplied, and which control circuit (5) receives at its other input the terminal voltage (Vm) of the motor (1). The control circuit (5) controls the power transistor (T2) via a transistor (T1) in such a manner that the terminal voltage (Vm) of the motor (1) is always between two predetermined values (Vmin and Vmax).