PULSE WIDTH MODULATION POWER CIRCUIT

摘要

A pulse width modulation speed control for a d.c. motor (12). A control input (26) corresponding to a motorist setting or a sensed condition is coupled to pulse width modulation circuit (16) that generates a variable duty cycle signal. The signal is used to adjust the speed of the motor. Auxiliary sensing of the motor's operating condition, such as current sensing, automatically shuts down the motor.