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| A Topological-Transformation Multi-Resonant DC Converter with Smooth Mode Switching Characteristic |
| Wang Yifeng1, Chen Mengying1, Tian Bailing1, Yang Liang2, Li Zhanchun3 |
1. School of Electrical and Information Engineering Tianjin University Tianjin 300072 China;
2. National Electric Power Dispatching and Control Center State Grid Corporation of China Beijing 100031 China;
3. State Grid Tianjin Electric Power Corporation Chengxi District Supply Company Tianjin 300113 China |
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Abstract In this paper, a topological transformation multi-resonant soft-switching DC-DC converter and its transient smoothing control method are proposed. By introducing auxiliary switches, the converter can flexibly adjust its structure among three operating modes to achieve a fast and wide range regulation of voltage gain in a narrow frequency range, and obtain the advantage of high efficient conversion in a wide range of voltage gain. At the same time, for the problem of large voltage fluctuations in the mode switching process, the proposed transient control method adopts the way of the driving signal gradient control to achieve smooth switching between the modes and effectively suppress the voltage fluctuation during the process of switching. Finally, the proposed converter topology is verified by an experimental prototype. It is demonstrated that the converter can maintain the stability of the output voltage in a wide input voltage range (80~600V), achieve a smooth switching, and always hold a higher conversion efficiency (97.2%~98.2%). Meanwhile, by adopting the transient control method, the transient voltage fluctuations during the two switching processes are reduced from 38.4V to 10.8V and 35.2V to 8.4V respectively, achieving a smooth mode transition.
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Received: 09 July 2018
Published: 30 October 2019
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2019, Vol. 34 
