Abstract
The purpose of this paper is to improve dynamic characteristics of dc-dc converters in the information and telecommunications system by using a proportional and integral gain changeable control method. Generally, stability becomes worse and a limit cycle oscillation occurs when large PID control gains are used. In the proposed method, the proportional gain is risen during a transient state to improve the transient response and avoid the limit cycle oscillation. Also, the integral gain is set to a small value in the continuous conduction mode and a large value in the discontinuous conduction mode. As a result, the proposed method has a superior transient response and high stability to a conventional fixed gain PID control method.
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