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Modeling and Implementation of Fixed Switching Frequency Sliding Mode Control to Two-Stage DC-DC Converter

Changhao Piao, Chao Jiang, Hongtao Qiao, Chongdu Cho, and Sheng Lu*
International Journal of Control, Automation, and Systems, vol. 12, no. 6, pp.1225-1233, 2014

Abstract : A fixed switching frequency sliding mode (FSFSM) controller for two-stage DC-DC converter is proposed. Owing to the time-varying switched mode operation, the dynamic performance of two-stage converter becomes high order and non-linear. For designing the FSFSM controller, the state-space average model is made, and then the three conditions of sliding mode (SM) control, namely, hitting, existence and stability condition are analyzed. A conventional linear controller (Lag) for two-stage converter is designed as a comparison to validate the good robustness and dynamic response of the FSFSM controller. At last, a series of simulation and experimental results are presented to demonstrate the feasibility of the designed FSFSM controller.

Keyword : Lag control, pulse-width modulation, sliding mode control, two-stage DC-DC converter.

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