Abstract The traditional phase-shifted full-bridge converter uses the method of period averaging model to design linear control links, which cannot satisfy the robustness demand for distributed power supply. This paper proposed a PWM full order sliding mode control for phase-shifted full-bridge with four subsystems. Based on the equivalent dynamic model of PSFB, the integral element is introduced in the sliding surface to eliminate the steady-state error. Meanwhile, the analysis of the sliding mode motion in the state space and its strict existence conditions were carried out, and the equivalent PWM control function was provided. On the basis of the equivalent function, the switching control was involved and the robustness conditions were analyzed. The experimental results show that the proposed control strategy can not only improve the robustness and adjusting performance, but also fix switching frequency to avoid the frequency changes when the operating conditions change.
Gao Ming,Wang Dazhi,Li Zhao. A PWM Full Order Robustness Sliding Mode Control for Phase-Shifted Full-Bridge Converter[J]. Transactions of China Electrotechnical Society, 2018, 33(10): 2293-2302.
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