A Single-Phase Full-Bridge Three-Level Energy-Saving Inverter

doi:10.3969/j.issn.0372-2112.2018.12.034

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ACTA ELECTRONICA SINICA ›› 2018, Vol. 46 ›› Issue (12) : 3068-3072. DOI: 10.3969/j.issn.0372-2112.2018.12.034

A Single-Phase Full-Bridge Three-Level Energy-Saving Inverter

WANG Qiang^1,2, YUE Yuan-shao^1,2, WANG Tian-shi^1,2, LIU Xiao-qin^1,2

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Abstract

When switching frequency increases, the switching losses in the single-phase full-bridge hard-switching inverter will also increase significantly so that the inverter is in low efficiency. In order to solve this problem, a single-phase full-bridge three-level energy-saving inverter is proposed. By resonance in the auxiliary commutation circuit, the voltage across capacitors in parallel with the main switches decreases to zero and the main switches could achieve zero-voltage switching. Furthermore, two groups of bidirectional auxiliary switches can achieve zero-voltage switching and zero-current switching respectively in the process of commutation. The working state of the circuit is analyzed. Experimental results show that the main switch and auxiliary switch can achieve soft switching. Therefore, the single-phase full-bridge three-level inverter can operate in high efficiency.

Key words

three-level / inverter / zero-voltage switching / zero-current switching / bidirectional switch

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WANG Qiang, YUE Yuan-shao, WANG Tian-shi, LIU Xiao-qin. A Single-Phase Full-Bridge Three-Level Energy-Saving Inverter[J]. Acta Electronica Sinica, 2018, 46(12): 3068-3072. https://doi.org/10.3969/j.issn.0372-2112.2018.12.034

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Funding

National Natural Science Foundation of China (No.51207069); Natural Science Foundation of Liaoning Province (Guide Plan) (No.20170540586); Scientific Research Cultivation Fund of Liaoning Shihua University (No.2016PY-016)