Abstract：In this paper, a DC-DC converter with high voltage gain and soft-switching characteristics is proposed, which combines switched-capacitor network and three-winding coupled inductor. The proposed converter can achieve the voltage regulation ability by PWM technique, and the high voltage gain without an extreme duty cycle. The introduction of couple inductor can help to reduce the number of diodes and capacitors, leading to the reduction in the conduction losses and the cost of the converter. The voltage stresses of all semiconductor devices are at low level, and low voltage rating devices with better performance can be employed to reduce the conduction losses significantly. All the active switches can realize zero-voltage switching (ZVS) turn-on. Some of the diodes can achieve zero-current switching (ZCS) turn-off, and the turn-off di/dt rates of the other diodes are controlled by the leakage inductance of the coupled inductor, so the reverse recovery problems of all diodes are alleviated effectively. Therefore, the proposed converter has the potential to further improve the efficiency of the high step-up converter. The operation principle, voltage gain characteristic, device voltage stresses, input current ripple, and soft-switching conditions were analyzed in detail. Finally, the theoretical analysis was verified by a 600W prototype converter with 25~40V input and 400V output.
雷浩东, 郝瑞祥, 游小杰, 李芳. 基于开关电容和三绕组耦合电感的高电压增益DC-DC变换器[J]. 电工技术学报, 2020, 35(17): 3666-3677.
Lei Haodong, Hao Ruixiang, You Xiaojie, Li Fang. High Voltage Gain DC-DC Converter With Switched-Capacitor and Three-Winding Coupled Inductor. Transactions of China Electrotechnical Society, 2020, 35(17): 3666-3677.
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2020, Vol. 35 
