MOTOR DRIVE CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a motor drive control system capable of suppressing a malfunction due to a misdetection of current passing through an H bridge circuit.SOLUTION: A motor drive control system includes a backflow detection circuit that outputs a backflow detection signal when current passes through a coil load in a second direction opposite to a first direction during a high speed attenuation mode. A PWM control circuit shifts an H bridge circuit state from the high speed attenuation mode to a low speed attenuation mode according to the backflow detection signal.