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Simulation Tools and Techniques. 13th EAI International Conference, SIMUtools 2021, Virtual Event, November 5-6, 2021, Proceedings

Research Article

Application of Cascode GaN HEMT in LLC Soft Switching Converter

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  • @INPROCEEDINGS{10.1007/978-3-030-97124-3_16,
        author={Kaiyuan Qin and En Fang and Yuan-ming Zhang},
        title={Application of Cascode GaN HEMT in LLC Soft Switching Converter},
        proceedings={Simulation Tools and Techniques. 13th EAI International Conference, SIMUtools 2021, Virtual Event, November 5-6, 2021, Proceedings},
        proceedings_a={SIMUTOOLS},
        year={2022},
        month={3},
        keywords={Cascode GaN device Hard switch Soft switch Application research},
        doi={10.1007/978-3-030-97124-3_16}
    }
    
  • Kaiyuan Qin
    En Fang
    Yuan-ming Zhang
    Year: 2022
    Application of Cascode GaN HEMT in LLC Soft Switching Converter
    SIMUTOOLS
    Springer
    DOI: 10.1007/978-3-030-97124-3_16
Kaiyuan Qin1, En Fang1,*, Yuan-ming Zhang2
  • 1: School of Electrical and Control Engineering, Xuzhou University of Technology, Xuzhou
  • 2: State Grid Suqian Power Supply Company, Suqian
*Contact email: fangen@cumt.edu.cn

Abstract

After decades of development, the performance of Si-based power switching devices is approaching its material limits. The power electronic converter is limited to further growth in the direction of high frequency, high efficiency, and high power density. As an outstanding representative of the third generation of wide bandgap semiconductor devices, the cascode GaN HEMT utilizes a cascode structure to achieve the normally-off nature of GaN devices, with unmatched steady-state and dynamic performance of Si-based devices. In order to promote its replacement of Si devices and give full play to the performance advantages, the cascode GaN HEMT is applied to the soft-switching topology of the LLC resonant converter in this paper. The relationship between the output capacitance and the dead-time of the switching device is analyzed. The effects with root mean square values of the first and second side currents are also considered. Taking advantage of the small output capacitance of the cascode GaN HEMT, the circulating current of the converter is reduced, which leads to further reduction of the conduction and transformer loss. Thus, the efficiency of the converter is improved. An LLC converter with 97% maximum efficiency and 96.2% total load efficiency was built to prove the correctness and effectiveness of the analysis.

Keywords
Cascode GaN device Hard switch Soft switch Application research
Published
2022-03-31
Appears in
SpringerLink
http://dx.doi.org/10.1007/978-3-030-97124-3_16
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