| 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) |
| Author | Institution | Email |
| YI Lingzhi |
Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan University, Xiangtan , China |
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| 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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