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| Characteristic Analysis of High-Frequency-Link Current of Series Resonant Indirect Matrix Type Power Electronics Transformer and Switching Frequency Design |
| Hu Yujie1,2, Li Zixin1,2, Luo Long1,2, Zhao Cong1,2, Li Yaohua1,2 |
1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Science Beijing 100190 China;
2. University of Chinese Academy of Sciences Beijing 100049 China |
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Abstract Series resonant indirect matrix type power electronic transformer (PET) can achieve high power density by high frequency switching and reducing dc capacitance. However, small dc capacitors will change the equivalent capacitance of the resonant circuit and affect the high frequency resonant current characteristics. Then, the zero current switching (ZCS) may be lost. In this paper, the equivalent circuit of the series resonant indirect matrix type PET with small dc capacitors is established. Analytical expression of high frequency current in time domain is derived, and switching frequency is designed to achieve ZCS. The influence of dc capacitance and dead time on switching frequency is revealed. Simulation and experimental results verify the correctness of the theoretical analysis.
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Received: 30 December 2020
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2022, Vol. 37 
