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CHEN Xiao,ZHAO Yadong,ZHANG Yu.Design of Single-phase Three-level Converter Based on SiC MOSFET[J].JOURNAL OF POWER SUPPLY,2021,19(2):57-65
Design of Single-phase Three-level Converter Based on SiC MOSFET
Received:March 04, 2020  Revised:February 28, 2021
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DOI:10.13234/j.issn.2095-2805.2021.2.57
Keywords:single-phase three-level converter  SiC device  efficiency  switching loss
Fund Project:Key scientific research projects of Henan universities in 2019(19A460010);Anyang key laboratory of advanced aeronautical materials and processing technology; Research and Cultivation Fund Project of Anyang engineering college in 2019(YPY2019009)
        
AuthorInstitutionEmail
CHEN Xiao School of Mechanical Engineering, Anyang Institute of Technology, Anyang , China chaohxxen3587@126.com
ZHAO Yadong School of Mechanical Engineering, Anyang Institute of Technology, Anyang , China
ZHANG Yu School of Mechanical Engineering, Anyang Institute of Technology, Anyang , China
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Abstract:
      To improve the efficiency of a high switching frequency and small power single-phase AC/DC/AC converter, a high-efficiency single-phase three-level three-leg converter based on SiC MOSFET is designed. The novel converter includes two T-type three-level legs (which are used for the rectifier and the inverter) and a common leg. The multi-level topology can optimize the harmonic performance and reduce the switching loss. The operating mode of the converter is analyzed, and a cascade voltage and current controller including DC voltage control is designed. At the same time, the use of SiC MOSFET devices for the outer switches of the T-type three-level leg can greatly reduce the switching loss because it blocks the entire DC-link voltage. Based on the analysis of conduction loss and switching loss, the losses at different switching frequencies are compared, so that the optimal switching frequency for the converter can be chosen. A 3 kW single-phase three-level three-leg converter prototype was built and tested, and experimental results verified that the novel converter can achieve an efficiency of 99% while ensuring satisfying output power quality.
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