一种两开关双通道容性区谐振变换器拓扑及软开关

doi:10.19595/j.cnki.1000-6753.tces.250991

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Abstract The LLC resonant converter is widely recognized in renewable energy and energy storage systems for its high efficiency, wide voltage-gain range, and suitability for high-frequency operation. Nevertheless, conventional LLC converters suffer from inherent technical limitations. When the resonant current operates in the inductive region, the voltage gain range is relatively narrow, restricting its adaptability under wide input or output variations. When the resonant current enters the capacitive region, the zero-voltage switching (ZVS) of the primary switches collapses, leading to increased switching losses, reduced efficiency, and reliability concerns.
This paper proposes a dual-switch dual-channel hybrid resonant converter. The proposed topology introduces an LLCL-type resonant tank as an auxiliary channel, integrated with the traditional LLC tank to form a composite resonant network. The auxiliary channel provides additional resonant current to maintain ZVS, thereby solving the ZVS failure inherent in capacitive operation. At the same time, the hybrid structure significantly broadens the achievable gain range, offering enhanced adaptability to wide variations in voltage and load.
Theoretical analysis is conducted through both fundamental harmonic approximation (FHA) and time-domain modeling. The gain equations of the hybrid resonant converter are derived, and the respective gain ranges of the LLC and LLCL channels are clarified. In constant-current operation, at a load current of 9 A, the converter achieves a sixfold voltage gain with only a 1.2-fold increase in frequency. Compared with inductive-region operation, the capacitive-region operation of the proposed converter achieves a broader voltage gain range with narrower frequency variation. Meanwhile, the LLCL auxiliary channel provides sufficient soft-switching current to ensure ZVS for the primary switches.
Furthermore, combined with the FHA and time-domain models, the total soft-switching current expression of the LLC channel in the capacitive region is derived. The ZVS boundary conditions are established, and a boundary gain curve is constructed. Then, a soft-switching inductor is introduced to compensate for the phase shift of the resonant current during capacitive operation and to guarantee ZVS across the full voltage and load range. In addition, critical design considerations for the resonant tanks and high-frequency transformer are provided.
A 1.7 kW prototype with an output voltage range of 20 V to 120 V is developed. The control platform employs an FPGA (EP3C25E144I7N), programmed in Verilog HDL, to implement pulse-frequency modulation (PFM). Extensive experiments are conducted, including steady-state tests in constant-current and constant- resistance modes and dynamic response evaluations during mode transitions. The results show that the converter consistently achieves ZVS across the entire operating range. Moreover, the measured efficiency and gain characteristics agree well with theoretical predictions. The peak efficiency is 96.3%.
In summary, this work presents a dual-switch dual-channel hybrid resonant converter. By incorporating an LLCL auxiliary resonant channel, the proposed converter ensures ZVS in the capacitive region and realizes an expanded gain range with reduced frequency variation. The combination of rigorous modeling, detailed design, and experimental validation demonstrates the superior efficiency, robust soft-switching, and wide adaptability of the converter, making it highly suitable for renewable energy and energy storage power conversion systems.

Key words： LLC type resonant converter wide voltage range capacitive region operation soft switching high-order resonant cavity

Received: 09 June 2025

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TM46

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	Zhang Cheng
	Zou Minyang
	Nie Jianglin
	Liu Xian
	Shu Zeliang

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Zhang Cheng,Zou Minyang,Nie Jianglin等. A Two-Switch Dual-Channel Capacitive-Region Resonant Converter Topology and Soft-Switching[J]. Transactions of China Electrotechnical Society, 2026, 41(10): 3340-3352.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250991 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I10/3340

[1] 王翌琛, 王丰, 卓放, 等. 基于过谐振调频扩展移相控制的CLLC谐振变换器电流优化策略[J]. 电力系统自动化, 2025, 49(3): 178-188.
Wang Yichen, Wang Feng, Zhuo Fang, et al.Current optimization strategy for CLLC resonant converter based on over-resonant frequency modulation and extended phase-shift control[J]. Automation of Elec- tric Power Systems, 2025, 49(3): 178-188.
[2] Bai C, Han B, Kwon B H, et al.Highly efficient bidirectional series-resonant DC/DC converter over wide range of battery voltages[J]. IEEE Transactions on Power Electronics, 2020, 35(4): 3636-3650.
[3] 高鑫, 司哲伦, 朱春波, 等. 电动汽车动态无线供电系统位置检测技术研究综述[J]. 电工技术学报, 2025, 40(14): 4460-4482.
Gao Xin, Si Zhelun, Zhu Chunbo, et al.Review on position detection technology of electric vehicle dynamic wireless power supply system[J]. Trans- actions of China Electrotechnical Society, 2025, 40(14): 4460-4482.
[4] 赵永秀, 刘泽伟, 王崇杰, 等. 变模态倍压型LLC谐振变换器多目标参数优化[J]. 电工技术学报, 2024, 39(22): 7139-7153.
Zhao Yongxiu, Liu Zewei, Wang Chongjie, et al.Multi objective parameter optimization of variable mode voltage doubling LLC resonant converter[J]. Transactions of China Electrotechnical Society, 2024, 39(22): 7139-7153.
[5] 陈杰, 刘昌咏, 邓文明, 等. 四开关三电平半桥 LLC变换器的控制策略与效率优化[J]. 电工技术学报, 2024, 39(24): 7833-7845.
Chen Jie, Liu Changyong, Deng Wenming, et al.Control improvement and efficiency optimization of four switch three-level half-bridge LLC converter[J]. Transactions of China Electrotechnical Society, 2024, 39(24): 7833-7845.
[6] 岳改丽, 张哲, 杜光辉, 等. 储能电池双向DC-DC变换器控制策略[J]. 电工技术学报, 2025, 40(20): 6618-6629.
Yue Gaili, Zhang Zhe, Du Guanghui, et al.Control strategy of bidirectional DC-DC converter for energy storage battery[J]. Transactions of China Electro- technical Society, 2025, 40(20): 6618-6629.
[7] 杨松霖, 洪应平, 杨学良. 基于全桥LLC的宽电压输入DC/DC变换器参数设计[J]. 现代电子技术, 2026, 49(8): 7-13.
Yang Songlin, Hong Yingping, Yang Xueliang.Parameter design of wide voltage input DC/DC converter based on full-bridge LLC[J]. Modern Electronics Technique, 2026, 49(8): 7-13.
[8] 林昊, 林国庆, 林羽静. 一种双半桥三通道超宽增益LLC谐振变换器及其控制策略[J]. 中国电机工程学报, 2026, 46(5): 2022-2033.
Lin Hao, Lin Guoqing, Lin Yujing.A dual half-bridge three-channel ultra-wide gain LLC resonant converter and its control strategy[J]. Proceedings of the CSEE, 2026, 46(5): 2022-2033.
[9] Liu Fei, Ruan Xinbo, Huang Xinze, et al.Second harmonic current reduction for two-stage inverter with DCX-LLC resonant converter in front-end DC-DC converter: modeling and control[J]. IEEE Transactions on Power Electronics, 2021, 36(4): 4597-4609.
[10] 金涛, 肖晓森, 张钟艺, 等. 基于宽范围增益和效率的LLC谐振变换器设计方法[J]. 电机与控制学报, 2023, 27(10): 108-119.
Jin Tao, Xiao Xiaosen, Zhang Zhongyi, et al.Design method of LLC resonant converter based on wide range gain and efficiency[J]. Electric Machines and Control, 2023, 27(10): 108-119.
[11] Shafiei N, Ordonez M, Ali Saket Tokaldani M, et al. PV battery charger using an L3C resonant converter for electric vehicle applications[J]. IEEE Transactions on Transportation Electrification, 2018, 4(1): 108-121.
[12] Khan S, Sha Deshang, Jia Xiangshuai, et al.Resonant LLC DC-DC converter employing fixed switching frequency based on dual-transformer with wide input-voltage range[J]. IEEE Transactions on Power Electronics, 2021, 36(1): 607-616.
[13] 王德玉, 李沂宸, 赵清林, 等. 采用定频移相控制的宽输出范围多电平LLC谐振变换器[J]. 中国电机工程学报, 2023, 43(5): 1973-1984.
Wang Deyu, Li Yichen, Zhao Qinglin, et al.Wide output range multi-level LLC resonant converter with fixed-frequency phase-shift control[J]. Proceedings of the CSEE, 2023, 43(5): 1973-1984.
[14] Hu Haibing, Fang Xiang, Chen F, et al.A modified high-efficiency LLC converter with two transformers for wide input-voltage range applications[J]. IEEE Transactions on Power Electronics, 2013, 28(4): 1946-1960.
[15] Lin B R.Analysis and implementation of wide zero- voltage switching dual full-bridge converters[J]. IET Power Electronics, 2016, 9(4): 751-760.
[16] 陈梦颖, 王议锋, 陈庆, 等. 一种可变结构型高效宽增益多谐振软开关直流变换器[J]. 电工技术学报, 2021, 36(20): 4225-4236.
Chen Mengying, Wang Yifeng, Chen Qing, et al.A variable topology multi-resonant soft-switching DC- DC converter with high efficiency and wide gain[J]. Transactions of China Electrotechnical Society, 2021, 36(20): 4225-4236.
[17] 孙鑫宇, 邓宇豪, 聂江霖, 等. 一种超宽电压增益双LLC谐振变换器及控制方法[J]. 中国电机工程学报, 2024, 44(5): 1974-1985.
Sun Xinyu, Deng Yuhao, Nie Jianglin, et al.An ultrawide voltage gain dual LLC resonant converter and control method[J]. Proceedings of the CSEE, 2024, 44(5): 1974-1985.
[18] 张俊涛, 林国庆. 多模态超宽输出双LLC谐振变换器拓扑及控制策略[J]. 电工技术学报, 2025, 40(24): 8052-8065, 8079.
Zhang Juntao, Lin Guoqing.A variable-mode ultra- wide output voltage gain dual LLC resonant converter and control method[J]. Transactions of China Electrotechnical Society, 2025, 40(24): 8052-8065, 8079.
[19] 周国华, 邱森林, 张小兵. 宽增益高效率级联式四开关Buck-Boost LLC变换器[J]. 电工技术学报, 2024, 39(4): 1103-1115.
Zhou Guohua, Qiu Senlin, Zhang Xiaobing.Cascaded four-switch Buck-Boost LLC converter with wide gain range and high efficiency[J]. Transactions of China Electrotechnical Society, 2024, 39(4): 1103-1115.
[20] Kim C E, Baek J I, Lee J B.High-efficiency single- stage LLC resonant converter for wide-input-voltage range[J]. IEEE Transactions on Power Electronics, 2018, 33(9): 7832-7840.
[21] 李佳昊, 陈捷, 邵志冲, 等. LLC谐振变换器简化时域算法及其频率前馈控[J]. 中国电机工程学报, 2025, 45(8): 3147-3160.
Li Jiahao, Chen Jie, Shao Zhichong, et al.Simplified time-domain algorithm and frequency feedforward control of LLC resonant converter[J]. Proceedings of the CSEE, 2025, 45(8): 3147-3160.