Dynamic PID gain changing control for DC-DC converter

This paper presents a digital control method where changes PID parameter setting dynamically to improve transient characteristics of dc-dc converters. In the conventional PID control, those control parameters are selected as suitable values to satisfy stable characteristics both in transient state and steady state and keep the stability of system. Therefore, the value of control parameter tends to be a small one. In this paper, we propose the method where the PID parameter setting is changed to the suitable one in the transient state, where the value of control parameter is designed just to improve the transient response and takes larger one compared to the conventional PID control method. Using the proposed method, the transient response can be improved without the loss of stability of dc-dc converter.