SERVO CONTROL CIRCUIT, CONTROLLER OF ACTUATOR, AND IMAGING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a servo control circuit which maintains a satisfactory control characteristic even in a high frequency area and is subjected to PID control that is easily incorporated into an integrated circuit. SOLUTION: In the servo control circuit 100, a differential operating part 10 outputs a difference u between an amount in proportion to a detection signal x detected from a control object and an amount in proportion to a first signal f. An A/D converting part 21 digitally converts the output u of the differential operating part 10. An integrating part 22 digitally integrates an output U of the A/D converting part 21. A D/A converting part 23 performs analog conversion of an amount F in proportion to the output of the integrating part 22 and outputs the amount as a first signal f. An addition operating part 15 outputs a sum D of an amount in proportion to the output U of the A/D converting part 21 and an amount in proportion to the output F of the integrating part 22. A digital PI control part 40 generates a control signal Y for controlling the control object by performing a proportional operation and an integration operation on the basis of a deviation E between the output D of the addition operating part 15 and a target value R. COPYRIGHT: (C)2011,JPO&INPIT