ANALYSIS OF OPEN-CIRCUIT FAULT CHARACTERISTICS OF SWITCHING TUBE OF BIDIRECTIONAL CLLC RESONANT CONVERTER

Liu Yang; Zhao Lu; Ma Chengyao; Yin Zhenhuan; Ma Chi; Dong Kan

doi:10.19912/j.0254-0096.tynxb.2023-1494

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (1) : 531-539. DOI: 10.19912/j.0254-0096.tynxb.2023-1494

ANALYSIS OF OPEN-CIRCUIT FAULT CHARACTERISTICS OF SWITCHING TUBE OF BIDIRECTIONAL CLLC RESONANT CONVERTER

Liu Yang¹, Zhao Lu², Ma Chengyao^2,3, Yin Zhenhuan¹, Ma Chi¹, Dong Kan¹

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Abstract

The bidirectional symmetrical CLLC resonant converter has good soft switching characteristics, wide voltage regulation range, high power density, and broad application prospects. Switch tube open circuit fault is a common fault in power electronic converters. In order to study the characteristics of switch tube open circuit fault in bidirectional CLLC resonant converters, the topology and basic principles of CLLC converters are first introduced. The characteristics of six modes of transient characteristics and four modes of steady-state characteristics after switch tube open circuit fault are analyzed, and modal analysis method is used for modeling. On this basis, the voltage gain, resonant current stress, and resonant capacitor voltage stress of the CLLC converter after failure are studied, and the fault characteristics are compared and analyzed with those of the DBSRC converter when the switch tube open circuit fault occurs. This provides a theoretical basis for the selection of the topology structure of the DC-DC converter for on-board auxiliary converters. Finally, the accuracy of fault characteristic analysis was verified through simulation and experiments.

Key words

bidirectional CLLC resonant converter / switch tube open-circuit fault / resonant current stress / resonant capacitor voltage stress

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Liu Yang, Zhao Lu, Ma Chengyao, Yin Zhenhuan, Ma Chi, Dong Kan. ANALYSIS OF OPEN-CIRCUIT FAULT CHARACTERISTICS OF SWITCHING TUBE OF BIDIRECTIONAL CLLC RESONANT CONVERTER[J]. Acta Energiae Solaris Sinica. 2025, 46(1): 531-539 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1494

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