FEEDBACK CONTROL SYSTEM AND METHOD

摘要

The present disclosure provides a feedback control system and method for a bidirectional VCM. The system employs an analog core that is common to both the PWM and linear modes of operation. The analog core includes a feedback mechanism that determines the error in the current flowing through the motor. The feedback mechanism produces an error voltage that corresponds to the current error, and applies the voltage to a control driver. The control driver then controls the motor, based on the error voltage, in either a PWM or linear mode. By sharing a common core, the switching time between modes is improved. Furthermore, the output current error between modes is reduced.

主权项

1. A feedback control system, comprising:
an analog core; a control driver; and an electromagnetic load of a voice coil motor (VCM); wherein the analog core is arranged to provide feedback from the electromagnetic load to the control driver in order to regulate a current consumption of the VCM; the control driver is arranged to receive, from the analog core, an error voltage corresponding to an error in a current applied to the electromagnetic load; and the control driver is further arranged to control the current applied to the electromagnetic load based on the error voltage.