ZVS SPLIT-SWITCHED-CAPACITOR HIGH-GAIN CONVERTER WITH LOWER VOLTAGE STRESS AND POWER DEVICES

Wang Yafang; Chen Jialiang; Qian Tianhong; Chen Ruixiang; Qin Ling

doi:10.19912/j.0254-0096.tynxb.2024-0772

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 510-519. DOI: 10.19912/j.0254-0096.tynxb.2024-0772

ZVS SPLIT-SWITCHED-CAPACITOR HIGH-GAIN CONVERTER WITH LOWER VOLTAGE STRESS AND POWER DEVICES

Wang Yafang, Chen Jialiang, Qian Tianhong, Chen Ruixiang, Qin Ling

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Abstract

In order to improve the conversion efficiency of photovoltaic DC modules, a high-gain Boost converter with low voltage stress and zero-voltage-switching （ZVS） is proposed. Benefitting from the split-switched-capacitor and charge pump circuits, the voltage gain and power transistor voltage stress becomes twice and half times that of a conventional Boost converter. Furthermore, one diode in the split-switched capacitor network has been substituted with a synchronous rectifier switch. Meanwhile, the rear-end inductor current is allowed to flow in both directions and with a specific constrained peak-to-peak value, thus achieving ZVS turn-on of all switches and natural turn-off or near zero-current turn-off of the diodes throughout the entire operating condition range. Firstly, the working principle and steady-state characteristics of the converter were analyzed, followed by the implementation conditions of soft switching and the design method of inductance parameters. Finally, the theoretical analysis was validated through experiments on a 250 W prototype. The research results show that the maximum efficiency of the converter can reach 97.6%.

Key words

photovoltaics / zero voltage switching / Boost converter / high-gain / split switched capacitor / low voltage stress

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Wang Yafang, Chen Jialiang, Qian Tianhong, Chen Ruixiang, Qin Ling. ZVS SPLIT-SWITCHED-CAPACITOR HIGH-GAIN CONVERTER WITH LOWER VOLTAGE STRESS AND POWER DEVICES[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 510-519 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0772

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