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| A Variable Topology Multi-Resonant Soft-Switching DC-DC Converter with High Efficiency and Wide Gain |
| Chen Mengying1, Wang Yifeng1, Chen Qing2, Yang Liang3, Han Fuqiang4 |
1. School of Electrical and Information Engineering Tianjin University Tianjin 300072 China;
2. State Grid Jiangsu Electric Power Co. Ltd Nanjing 211000 China;
3. National Electric Power Dispatching and Control Center State Grid Corporation of China Beijing 100031 China;
4. State Grid Nanjing Power Supply Company Nanjing 210019 China |
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Abstract A variable topology multi-resonant soft-switching DC-DC converter is proposed in this paper. Applying the double transformer structure, this converter can transform the topological structure through two complementary turn-on auxiliary switches. There are three working modes, which can meet the requirements of high voltage gain or high efficiency under different working conditions. In addition, resonant parameters of the converter are designed by setting the resonant frequency and gain point reasonably. Subsequently, according to the condition that the converter transmits the fundamental and third harmonic energy simultaneously under rated conditions, a loss model considering both the fundamental wave and the third harmonic is constructed, and the loss distribution of the converter is estimated in detail. Finally, in order to verify the reliability of the theoretical analysis, this paper conducted a power experiment on the converter based on an experimental prototype. Within the input voltage range of 80~600V, the output voltage is always stable at 400V, and a wide voltage gain range is obtained. At the same time, high efficiency conversion within the full gain range is achieved, and the maximum efficiency of the converter is 97.6%.
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Received: 09 July 2020
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2021, Vol. 36 
