Patent ID: 7899563

Claim:
A system control device comprising: a semiconductor element; actual control value acquisition means for acquiring the information about an actual control value of the semiconductor element; deviation computation means for computing the deviation between the actual control value and a target control value; integral term computation means for computing an integral term contained in a control command value; first control command value computation means for determining a first control command value, which is the next control command value, from the immediately preceding integral term and the deviation; first feedback control means for exercising feedback control over the semiconductor element in accordance with the first control command value; protective control means for providing protective control by temporarily halting the semiconductor element or by exercising control at an output level lower than the target control value while allowing the first control command value computation means to perform computations during a period during which the first feedback control means exercises control; control command value decrease means for decreasing the control command value; termination time acquisition means for acquiring the information about the termination time for the protective control; and termination control means which uses a control command value that is rendered smaller, by the control command value decrease means, than the first control command value computed by the first control command value computation means for the first time after the termination time, as the initial control command value after the termination time and in place of the first control command value.