Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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High-frequency planar transformer optimal design and analysis

  • Yu Tang (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology) ;
  • Guanghui Wang (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology) ;
  • Zhe Shi (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology) ;
  • Jincai Niu (School of Electrical Engineering, Chaohu University)
  • Received : 2022.05.27
  • Accepted : 2022.10.05
  • Published : 2023.02.20
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Abstract

Due to the rapid development of modern industry, there is an increasing demand for isolated switching power supplies (SMPS) with a high efficiency and a high power density. Magnetic components, which occupy most of the converter volume, have been a key bottleneck in achieving high power density. This paper presents an optimal design method for high power density planar transformers. Applying the principle of flux cancellation, a matrix transformer that originally needed an independent magnetic core was integrated into a single magnetic core to reduce the volume of the core. Meanwhile, a loss model of the transformer is established, and an optimized design method of the winding structure is given according to that model to further reduce the winding loss of the transformer. Finally, an LLC converter with a resonant frequency of 1 MHz is designed to verify the practical performance of the proposed transformer.

Keywords

Acknowledgement

This work is funded by Science Fund for Distinguished Young Scholars of Hebei Province (E2020202140); Program for Top 100 Innovative Talents in Colleges and Universities of Hebei Province, (SLRC2019025); Hebei Provincial Central Government Guided Local Science and Technology Development Fund Project (216Z4401G).

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