HIGH GAIN SOFT SWITCHING QUASI-Z-SOURCE DC-DC CONVERTER

Zhang Tao; Bai Wenlong; Zhang Li; Han Qinglin; Li Yunfei; Zhang Yafei

doi:10.19912/j.0254-0096.tynxb.2024-1700

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 8-17. DOI: 10.19912/j.0254-0096.tynxb.2024-1700

HIGH GAIN SOFT SWITCHING QUASI-Z-SOURCE DC-DC CONVERTER

Zhang Tao^1,2, Bai Wenlong¹, Zhang Li^1,3, Han Qinglin¹, Li Yunfei¹, Zhang Yafei¹

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Abstract

To address the issues of low voltage gain and high voltage stress existing in traditional quasi-Z-source DC-DC converters, a high-gain soft-switching quasi-Z-source DC-DC converter （HGSS-QZS） is proposed. By adjusting both the turns ratio of the three-winding coupled inductor and the duty cycle of the switch, the boost capability and the flexibility of gain adjustment are improved. A clamping circuit is employed to absorb the leakage energy of the coupled inductor, reducing the voltage spikes caused by leakage inductance. Firstly, the operating principle of the HGSS-QZS converter is analyzed in detail, and voltage gain, device voltage and current stress, and efficiency losses are derived. Next, parameter design is carried out and compared with existing converters, demonstrating that the HGSS-QZS converter offers high voltage gain, low voltage stress on components, soft-switching capability, and high efficiency. Finally, a 200 W experimental prototype was built, and the validity and feasibility of the HGSS-QZS converter were verified through simulation and experimental comparison.

Key words

DC-DC converters / quasi-Z-source / high gain / PV power generation / soft switching / coupled circuits / three-winding

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Zhang Tao, Bai Wenlong, Zhang Li, Han Qinglin, Li Yunfei, Zhang Yafei. HIGH GAIN SOFT SWITCHING QUASI-Z-SOURCE DC-DC CONVERTER[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 8-17 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1700

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