Design of High Frequency and Wide Voltage Range Isolated Bidirectional DC-DC Converter

Jia, Haiyang; Huang, Yangtao; Yu, Zheyuan; Tian, Mofan; Duan, Ziyue; Wang, Zihang; Yang, Xu; Wang, Laili; Zhuo, Chaoran

doi:10.1109/peac.2018.8590432

Cited by 7 publications

(1 citation statement)

References 9 publications

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“…However, these methods all suffer from a large amount of calculation, which is not conducive to popularization and the effect is limited. In terms of control, [22]- [24] adopt the hybrid control strategy which combines the variable frequency control and phase shift control can greatly expand the working range of the converter with gain less than 1, but the low efficiency problem remains when the converter works at high gain condition.…”

Section: Introductionmentioning

confidence: 99%

Study on a Modified CLLC Converter Paralleling a Resonant Branch With the Transformer for Wide Voltage Range Applications

Wang,

Cheng,

Xie

2024

IEEE Access

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In this paper, a modified bidirectional CLLC DC/DC converter is proposed to improve the efficiency in wide voltage range applications. The proposed converter adopts a LC series resonant branch parallel with the transformer, so that the equivalent inductance of the parallel branch and the transformer magnetizing inductor varies with the switching frequency. When the required gain is small and the operating frequency is high, the switch's turn-off current and the circulating power can be reduced through the large impedance of the LC resonant circuit; When the required gain is large, the switching frequency decreases and the auxiliary branch impedance decreases to obtain a higher voltage conversion ratio. The steady state operation and characteristics of the presented converter are analyzed, a design flowchart and a design example of the modified CLLC are also presented. Furthermore, the model of modified CLLC is established and is reduced for simple analysis. A 48V/400V/800W prototype was built and the experimental results verified the correctness of the proposed converter and the feasibility of the modeling results. Compared with the traditional CLLC resonant converter, the efficiency under wide voltage range application is significantly improved.INDEX TERMS Bidirectional DC-DC converter, CLLC converter, resonant converter, wide voltage range applications, equivalent circuit model, reduced-order model

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Section: Introductionmentioning

confidence: 99%