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YI Lingzhi,JIANG Kangning,HU Yanshen.Novel Passive Soft-switching Three-level Inverter[J].JOURNAL OF POWER SUPPLY,2021,19(2):41-47
Novel Passive Soft-switching Three-level Inverter
Received:November 08, 2018  Revised:February 07, 2021
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DOI:10.13234/j.issn.2095-2805.2021.2.41
Keywords:three-level inverter  soft switching  photovoltaic
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
        
AuthorInstitutionEmail
YI Lingzhi Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan University, Xiangtan , China
JIANG Kangning Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan University, Xiangtan , China 651202628@qq.com
HU Yanshen Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan University, Xiangtan , China;Shenzhen MOSO Electric Co., Ltd, Shenzhen , China
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Abstract:
      The soft-switching technology can improve the efficiency and power density to a maximal extent, which is the best choice that satisfies the high-power and high-frequency requirements in industrial applications. However, the existing soft-switching technology in the field of three-level inverters is not widely available, and it has shortcomings such as a large number of auxiliary switching devices, complicated control, oscillations, and large voltage stress in the switching tube. Therefore, a novel passive soft-switching three-level inverter is pro-posed in this paper. The auxiliary circuit is simple and does not need to change the modulation mode, thus realizing zero-voltage turn-off and zero-current turn-on of all the switching tubes smoothly. According to the equivalent circuit diagram in each mode, the working principle of the proposed soft-switching inverter is described in detail, and the basic conditions for soft-switching implementation are summarized. Finally, the test results of a prototype show that the proposed soft-switching inverter can realize soft-switching of all power tubes, the voltage stress in the power tube was limited to the safety margin, the voltage fluctuations at the midpoint were small, and the high-frequency oscillations disappeared in the commutation process.
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