Sliding-Mode Control Applied to DC-DC Buck Converter Based on Payload Estimator

• Main Authors: Lin, Chin-Chung, 林進忠
• Other Authors: Chen, Yon-Ping
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/31797585452206108810

碩士 === 國立交通大學 === 電機學院碩士在職專班電機與控制組 === 99 === In this thesis, a general DC-DC Buck converter model is derived by the state space average method, which is valid for continuous conduction mode. A sliding mode controller with an integral term of error function is proposed for constant frequency PWM-based DC-DC Buck converter. To reduce the influence of system uncertainty, a first-order estimator is also applied to estimate the unknown payload. With the sliding mode control, the system trajectory could be successfully driven to the sliding surface in a finite time even though the payload changes. In the sliding mode, the system is stabilized and the output voltage reaches the desired value, which fulfills the control goal. Finally, the proposed control scheme is demonstrated by the numerical simulation results.