考虑回流功率因素的全桥CLL谐振变换器参数优化设计

doi:10.19595/j.cnki.1000-6753.tces.230368

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摘要

CLL谐振变换器在工作中谐振电流会回流到输入源产生回流功率,回流功率的增加会导致变换器更多的传导损耗,这限制了转化效率的提高。对此,基于回流功率的定义对全桥CLL变换器的工作模态进行了详细分析,指出了在正负模态中都会有回流功率的产生。同时,分析了CLL变换器的交流等效模型,并结合产生回流功率的模态,得出了回流功率可用谐振腔输入电压和电流的相移角间接表征。在此基础上,提出了一种CLL变换器回流功率的简单表征方法,通过对谐振参数的优化设计来减小回流功率,从而提高转化效率。最后,通过两组谐振参数的仿真及实验对该设计方法进行了验证,结果表明在谐振频率点和满载条件下,转化效率提高约1.8%,验证了理论分析的正确性和可行性。

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关键词 ：全桥CLL谐振变换器, 回流功率, 参数优化设计, 转化效率, 软开关

Abstract：

Resonant converters are widely used in distributed power systems, notebook computers, communication equipment, and new energy electric vehicles with their excellent performance. However,the parameters of resonant elements in resonant converter are the main factors affecting the gain,loss,volume of the converter,etc. Therefore, the performance of the converter can be improved to some extent by optimizing the resonance parameters.
Among many resonant topologies, experts and scholars at home and abroad have studied the LLC resonant converter the most, and in the application of LLC is also the most widely used, while in this paper, we will study another new resonant topology converter, whose resonant tank is a T-type CLL structure, and whose operating characteristics are very similar to those of traditional LLC, and the same can be realized in the ZVS of the primary-side MOSFETs as well as the ZCS of the secondary-side diodes.The biggest advantage of the resonant converter is its high conversion efficiency, while the converter can not avoid the generation of backflow power during the operation, andthe increase of backflow power will lead to a sharp increase in the conduction loss and current stress of the converter switch, thus reducing the conversion efficiency.To address this problem, this paper will analyze and optimize the backflow power generated by the CLL resonant converter.
Firstly, a detailed analysis of the operating modes of the full-bridge CLL converter is conducted based on the definition of backflow power, which pointed out that backflow power is generated in both positive and negative operating modes, in addition,a time-domain expression for the backflow power is derived, but the high complexity of the defining equation itself makes it difficult to calculate and characterize the backflow power. Secondly, two things can be seen from the modal analysis of the backflow power: (1) The backflow power is essentially reactive power circulating in the circuit and is not directly equivalent to power loss. (2) The power loss due to the large amount of backflow power in the circuit is consumed only in the equivalent resistance of the active and passive components in the reactive path. Therefore, there is no need for a direct calculation, and it is sufficient to characterize it with a variable that is indicative of the backflow power.Thirdly,by analyzing the AC equivalent model of the CLL converter and combining it with the modes that generate the backflow power, it is derived that the backflow power can be indirectly characterized by the phase shift angle of the resonant tank input voltage and current.On this basis, a simple characterization method of the backflow power of CLL resonant converter is proposed, and the backflow power is reduced by optimizing the resonance parameters under the constraints of voltage gain and ZVS to improve the conversion efficiency.Finally, the design method is verified by simulation and experiment using two sets of resonant parameters, and the results show that the conversion efficiency is improved by about 1.8% at the resonant frequency point and under full-load conditions, which verifies the correctness and feasibility of the theoretical analysis.

Key words： Full-bridge CLL resonant converter Backflow power Parameter optimization design Transformation efficiency Soft-switching

PACS:

TM46

基金资助:

四川省科技计划项目（2023YFG0338, 2023YFG0191, 2022ZHCG0015）和四川省科技成果转移转化示范项目（2023ZHCG0039, 2023ZHCG0021）资助

通讯作者: 曹太强, 男,1969年生,博士,教授,硕士生导师,主要研究方向为电力电子与电力传动、光伏发电技术等。E-mail：ctq815@126.com

作者简介: 黄何伟, 男,1997年生,硕士研究生,主要研究方向为谐振DC-DC变换器拓扑分析及其性能优化。E-mail：634326231@qq.com

引用本文:

黄何伟, 曹太强, 潘光绪, 曹伟忠, 郑敏, 阳小明. 考虑回流功率因素的全桥CLL谐振变换器参数优化设计[J]. 电工技术学报, 0, (): 8928-. Huang Hewei, Cao Taiqiang, Pan Guangxu, Cao Weizhong, Zheng Min, Yang Xiaoming. Parameter Optimal Design of Full-Bridge CLL Resonant Converter Considering Backflow Power Factor. Transactions of China Electrotechnical Society, 0, (): 8928-.

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[1] 赵烈, 裴云庆, 刘鑫浩, 等. 基于基波分析法的车载充电机CLLC谐振变换器参数设计方法[J]. 中国电机工程学报, 2020, 40(15): 4965-4976, 23.
Zhao Lie, Pei Yunqing, Liu Xinhao, et al.Design methodology of CLLC resonant converters for electric vehicle battery chargers[J]. Proceedings of the CSEE, 2020, 40(15): 4965-4976, 23.
[2] 丁超, 李勇, 姜利, 等. 电动汽车直流充电系统LLC谐振变换器软开关电压边界分析[J]. 电工技术学报, 2022, 37(1) : 3-11.
Ding Chao, Li Yong, Jiang Li, et al.Analysis of soft switching voltage boundary of LLC resonant converter for EV DC charging system[J]. Transactions of China Electrotechnical Society, 2022, 37(1): 3-11.
[3] 王皓, 朱金大, 侯凯, 等. 基于混合控制式交错并联LLC谐振变换器的充电模块研制[J]. 电力系统自动化, 2017, 41(7): 108-113.
Wang Hao, Zhu Jinda, Hou Kai, et al.Development of charging module based on interleaving paralleled LLC resonant converter with hybrid control[J]. Automation of Electric Power Systems, 2017, 41(7) : 108-113.
[4] Zhao Bin, Zhang Xin.An efficiency-oriented two-stage optimal design methodology of high-frequency LCLC resonant converters for space travelling-wave tube amplifier applications[J]. IEEE Transactions on Industrial Electronics, 2020, 67(2): 1068-1080.
[5] Huang Daocheng, Fu Dianbo, Lee F C, et al.High-frequency high-efficiency - resonant converters with synchronous rectifiers[J]. IEEE Transactions on Industrial Electronics, 2010, 58(8): 3461-3470.
[6] Asa E, Colak K, Czarkowski D.Analysis of a CLL resonant converter with semi-bridgeless active rectifier and hybrid control[J]. IEEE Transactions on Industrial Electronics, 2015, 62(11): 6877-6886.
[7] Liu Yue, Wu Hongfei, Zou Jun, et al.CLL resonant converter with secondary side resonant inductor and integrated magnetics[J]. IEEE Transactions on Power Electronics, 2021, 36(10): 11316-11325.
[8] 吴建雪, 许建平, 陈章勇. CLL谐振变换器谐振电路参数优化设计[J]. 电力自动化设备, 2015, 35(1)79-84, 152
Wu Jianxue, Xu Jianping, Chen Zhangyong. Optimal design of resonant circuit parameters for CLL resonant converter[J]. Electric Power Automation Equipment, 2015, 35(1)79-84, 152
[9] Zhao Biao, Yu Qingguang, Sun Weixin.Extended-phase-shift control of isolated bidirectional DC-DC converter for power distribution in microgrid[J]. IEEE Transactions on Power Electronics, 2012, 27(11): 4667-4680.
[10] 范恩泽, 李耀华, 葛琼璇, 等. 基于优化移相的双有源串联谐振变换器前馈控制策略[J]. 电工技术学报, 2022, 37(20) : 5324-5333.
Fan Enze, Li Yaohua, Ge Qiongxuan, et al.Feedforward control strategy of dual active bridge series resonant converter based on optimized phase shift[J]. Transactions of China Electrotechnical Society, 2022, 37(20) : 5324-5333.
[11] 周路遥, 姜久春. LCL谐振型双有源全桥双向DC-DC变换器分析与控制[J]. 电力系统自动化, 2016, 40(19) : 82-86, 93.
Zhou Luyao, Jiang Jiuchun.Analysis and control of dual active bridge DC-DC converter based on LCL resonant network[J]. Automation of Electric Power Systems, 2016, 40(19) : 82-86, 93.
[12] Shi Haochen, Wen Huiqing, Chen Jie, et al.Minimum-backflow-power scheme of DAB-based solid-state transformer with extended-phase-shift control[J]. IEEE Transactions on Industry Applications, 2018, 54(4): 3483-3496.
[13] 金莉, 刘邦银, 段善旭. 三电平双有源全桥DC-DC变换器回流功率最小的移相控制[J]. 电工技术学报, 2018, 33(24) : 5864-5873.
Jin Li, Liu Bangyin, Duan Shanxu.Minimum reflux power strategy of three-level dual active bridge DC-DC converter with phase shift control[J]. Transactions of China Electrotechnical Society, 2018, 33(24) : 5864-5873.
[14] 杨超, 许海平, 张祖之, 等. PWM与移相结合控制下的混合三电平隔离型双向DC-DC最小回流功率控制研究[J]. 电工技术学报, 2019, 34(15) : 3186-3197.
Yang Chao, Xu Haiping, Zhang Zuzhi, et al.Minimum backflow power control of the hybrid three level isolated Bi-directional DC-DC converters based on PWM-phase-shifting control[J]. Transactions of China Electrotechnical Society, 2019, 34(15): 3186-3197.
[15] Shi Zhe, Tang Yu, Guo Yingjun, et al.Optimal design method of LLC half-bridge resonant converter considering backflow power analysis[J]. IEEE Transactions on Industrial Electronics, 2022, 69(4): 3599-3608.
[16] Kan Jiarong, Xie Shaojun, Tang Yu, et al.Voltage-fed dual active bridge bidirectional DC/DC converter with an immittance network[J]. IEEE Transactions on Power Electronics, 2014, 29(7): 3582-3590.
[17] 黄何伟,曹太强,李蔚,等.基于等效谐振腔的半桥CLL谐振变换器回流功率优化方法[J/OL].电源学报, [2023-04-28]1-15.
Huang Hewei, Cao Taiqiang, Li Wei, et al.Optimization method of backflow power of half-bridge CLL resonant converter based on equivalent resonant tanks[J/OL]. Journal of Power Supply, [2023-04-28]1-15.
[18] 任仁, 张方华, 刘硕. 基于LLC直流变压器(LLC-DCT)效率优化的死区时间与励磁电感设计[J]. 电工技术学报, 2014, 29(10): 141-146.
Ren Ren, Zhang Fanghua, Liu Shuo.Optimal design for efficiency based on the dead time and magnetizing inductance of LLC DC transformer[J]. Transactions of China Electrotechnical Society, 2014, 29(10): 141-146.