TOPOLOGY ANALYSIS OF GAN-BASED QUASI-SQUARE-WAVE BOOST CONVERTER

Wang Yifeng; Wang Zhongjie; Chen Bo; Wang Hao

doi:10.19912/j.0254-0096.tynxb.2021-0587

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (12) : 79-87. DOI: 10.19912/j.0254-0096.tynxb.2021-0587

TOPOLOGY ANALYSIS OF GAN-BASED QUASI-SQUARE-WAVE BOOST CONVERTER

Wang Yifeng¹, Wang Zhongjie¹, Chen Bo¹, Wang Hao²

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Abstract

Based on the application background of actual solar unmanned aerial vehicle, this paper conducts indepth research on its core power conversion part. By adding a small number of passive components on the basis of the traditional synchronous rectification Boost converter, using the continuity of the inductor current to construct the output capacitor discharge link of the power switch, the zero voltage switching of the power switch can be achieved while ensuring that the main power inductor current ripple is small. It overcomes the problem of large inductor current ripple when the traditional synchronous rectification Boost converter works in quasi-square-wave mode for soft switching. This helps to extend the service life of the UAV battery pack. Starting from the modal analysis of the topology, this article analyzes the realization process of the zero voltage switching of the power switch in detail. In addition, the parameter design of the converter is carried out, and the main loss calculation method of the whole converter is summarized. Finally, using GaN power switching devices, an experimental prototype with a rated power of 500 W was built and compared with the synchronous rectification Boost converter under the same working conditions. The experimental results are basically consistent with the theoretical analysis, and the peak efficiency reaches 96%. Verifying the accuracy of theoretical analysis and the practical feasibility of the topology.

Key words

solar energy / PV power / UAV / soft switching / conversion efficiency / quasi-square-wave converter

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Wang Yifeng, Wang Zhongjie, Chen Bo, Wang Hao. TOPOLOGY ANALYSIS OF GAN-BASED QUASI-SQUARE-WAVE BOOST CONVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(12): 79-87 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0587

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