準最適PWM制御系の設計

抄録

This paper presents a design method for suboptimal PWM (pulse-width-modulated) control systems which can nearly minimize a quadratic performance index. The suboptimal PWM control systems can be constructed in a closed-loop configuration with a state feedback. The proposed algorithm to decide control signals is very simple and easy, so that it can be applied to the DDC effectively. When the suboptimal control pulses are produced by the proposed algorithm, the polarity of a pulse is determined by the switching plane in the state space, and the suboptimal pulse width is determined by solving a specified quadratic equation reduced by some approximations.
In this paper, the result of the simulation of a second order controlled system is presented. It shows that the suboptimal PWM control systems are very near to the optimal PWM control systems in the control performance.
The authors also point out that some delay of the control pulse during each sampling period can improve the control performance under some specified initial states.