Sliding-Mode Control Applied to Buck DC-DC Converter Design

• Main Authors: Kun You Wu, 吳坤祐
• Other Authors: Yon-Ping Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/90185981336242031257

碩士 === 國立交通大學 === 電機學院碩士在職專班電機與控制組 === 95 === A sliding mode controller with the error integration between output voltage and command voltage for PWM-based Buck DC-DC converter is proposed. Constant switching frequency can be achieved with the proposed approach. For the controller design, this thesis adopts sliding mode control theorem because of its well-know robustness for system uncertainty. Without load estimator in the controller, this closed-loop system ideally should convert power flow into the prescribed form in spite of the load variation. With the unknown load condition we choose a sliding function with an integral term of error function such that the system is stabilized on the sliding surface. Then design the control algorithm such that the system reaches the sliding mode in a finite time. The simulation of the proposed closed-loop control scheme is illustrated to process fast transient response and robustness to load variation.