Abstract
In this paper, a structure-reconfigurable resonant DC-DC (direct current – direct current) converter is presented. By controlling the state of the auxiliary switch, the converter could change the resonant structure to acquire a high efficiency and wide voltage gain range simultaneously. The characteristics of the LLC (inductor-inductor-capacitor) resonant converter are firstly analyzed. Based on this, through introducing additional resonant elements and adopting the topology morphing method, the proposed converter can be formed. Moreover, a novel parameter selection method is discussed to satisfy both working states. Then, a detailed loss analysis calculation is conducted to determine the optimal switching point. In addition, an extra resonant zero point is generated by the topology itself, and the inherent over-current protection is guaranteed. Finally, a 500 W prototype is built to demonstrate the theoretical rationality. The output voltage is constant at 400 V even if the input voltage varies from 160 to 400 V. A peak efficiency of 97.2% is achieved.
Highlights
Owing to global warming and a severe energy crisis, the preferable renewable energy has turned into an effective solution
Wind power generation is the main form of the utilization of current wind energy
The converter works in the ZVS operation throughout. Such outstanding soft-switching characteristics guarantee a high efficiency in the entire gain range
Summary
Xianxu Huo 1 , Ke Xu 2 , Ruixin Liu 3, *, Xi Chen 3 , Zhanchun Li 4 and Haiyun Yan 5. State Grid Tianjin Electric Power Corporation Chengxi District Supply Company, Tianjin 300113, China
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