Control apparatus for controlling transistor chopper for use in current supply for electric motor

摘要

A control apparatus for controlling the supply of current for an electric motor, having a transistor chopper circuit which includes a plurality of power transistors connected in parallel, and a duty controlling oscillator circuit for controlling the ON-OFF operation of the transistor chopper circuit, by which the duty factor of current supplied for the motor through the transistor chopper circuit is controlled depending on a command signal, and wherein the operation of the duty controlling oscillator circuit is controlled depending on the amplitude of current flowing through one of the plurality of power transistors of the transistor chopper circuit.