STEADY STUDY ON QUASI-Z-SOURCE SOFT-SWITCHING CONVERTER WITH INTEGRATED DOUBLED CIRCUIT

Wang Fenglian; Zhou Mingzhu; Cao Yichang; Wei Zhengyi; Ding Xinping

doi:10.19912/j.0254-0096.tynxb.2021-1423

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (5) : 139-145. DOI: 10.19912/j.0254-0096.tynxb.2021-1423

STEADY STUDY ON QUASI-Z-SOURCE SOFT-SWITCHING CONVERTER WITH INTEGRATED DOUBLED CIRCUIT

Wang Fenglian¹, Zhou Mingzhu¹, Cao Yichang¹, Wei Zhengyi¹, Ding Xinping²

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Abstract

A quasi-Z-source soft-switching converter （qZS-SCSS） with integrated doubled circuit is presented. In qZS-SCSS converter, a technique of the synchronous rectifier is applied such that the diode of the impedance network is replaced with an auxiliary switch tube S_a. In this way, not only is conduction loss associated with the diode reduced but also zero-voltage-switching characteristics for main switches are provided. Also, diodes of qZS-SCSS converter are switched under zero-voltage-zero-current-switching condition which extremely reduces their switching and reverse recovery losses. At the same time, the leakage energy of the coupled element is absorbed through the clamp circuit. Converter of the qZS-SCSS has the advantages of continuous input current, common ground between the input and output ends, applicability to voltage gain requirements of photovoltaic power generation systems, high voltage gain and high efficiency. Operating principles of qZS-SCSS along with its steady-state analysis are presented. Finally, a prototype with an output power of 100 W was built to verify the correctness of theoretical analysis.

Key words

soft-switching / photovoltaic power / efficiency / high voltage gain / quasi-Z-source

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Wang Fenglian, Zhou Mingzhu, Cao Yichang, Wei Zhengyi, Ding Xinping. STEADY STUDY ON QUASI-Z-SOURCE SOFT-SWITCHING CONVERTER WITH INTEGRATED DOUBLED CIRCUIT[J]. Acta Energiae Solaris Sinica. 2023, 44(5): 139-145 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1423

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