CIRCUIT FOR DRIVING A STEPPER MOTOR AND METHOD OF CONTROLLING A STEPPER MOTOR DRIVER

摘要

A driver circuit (54) is provided for a stepper motor (52) which utilizes a processor (62) that outputs a PWM signal. The driver circuit (54) includes an H-bridge circuit having first and second inputs (64,90), and a switching circuit (68) having an input (66) and an output (88). The first H-bridge input (64) and the switching input (66) connect to the PWM signal output from the processor (62), and the switching output (88) connects to the second H-bridge input (90). The switching circuit (68) performs an inversion of a duty cycle of the PWM signal when the PWM signal is present, and a non-inversion of the duty cycle when the PWM signal is not present.