LOAD ADAPTIVE CONTROL LOOP SWITCHING METHOD AND LOAD ADAPTIVE FEEDBACK CONTROL DEVICE

PROBLEM TO BE SOLVED: To solve the problem in which a control target circuit becomes unstable at the time of switching a control loop in the conventional control loop switching method.SOLUTION: In the control loop switching method, a first error value ERR1 is added to a first error integrated value INTG1 to update the first integrated value INTG 1; a second error value ERR2 is added to a second error integrated value INTG 2 to update the second integrated value INTG 2; a PWM signal duty ratio is determined on the basis of an error integrated value indicating a smaller value between the updated first error integrated value INTG1 and second error integrated value INTG 2; and an error integrated value is updated out of the first error integrated value INTG 1 and the second error integrated value INTG 2, the error integrated value indicating the smaller value between the updated first error integrated value INTG 1 and second error integrated value INTG 2 and not used for determining the PWM signal duty ratio.