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LIU Yan,ZHANG Fanghua.Common-mode Noise Suppression Method for Full-bridge LLC Converter[J].JOURNAL OF POWER SUPPLY,2021,19(2):193-197
Common-mode Noise Suppression Method for Full-bridge LLC Converter
Received:August 17, 2018  Revised:November 19, 2018
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DOI:10.13234/j.issn.2095-2805.2021.2.193
Keywords:LLC converter  common mode  electromagnetic interference  noise model  balance capacitor
Fund Project:The National Natural Science Foundation of China (51777094)
     
AuthorInstitutionEmail
LIU Yan College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China liuyan@nuaa.edu.cn
ZHANG Fanghua College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China
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Abstract:
      Full-bridge LLC converters have been widely applied in medium-to-high power applications because of their simple topologies and ease of achieving soft-switching for all power switches. In this paper, the common-mode noise model of a full-bridge LLC converter is established, and the common-mode noise source and common-mode noise coupling path are analyzed. Moreover, a common-mode noise cancellation method based on balance capacitor is proposed, and the extraction method for the transformer's parasitic capacitance is given. Finally, the correctness of the established model and the feasibility of the proposed method were verified by experimental results.
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