三相CLLC谐振变换器磁集成平面变压器设计与优化  

Design and Optimization of Three-Phase CLLC Resonant Converter with Magnetic Integrated Planar Transformer

作　　者：程鹤[1] 徐恺 李朋圣 齐乃菊 于东升[1] Cheng He;Xu Kai;Li Pengsheng;Qi Naiju;Yu Dongsheng(School of Electrical Engineering,China University of Mining and Technology,Xuzhou,221116,China)

机构地区：[1]中国矿业大学电气工程学院,徐州221116

出　　处：《电工技术学报》2024年第12期3774-3786,共13页Transactions of China Electrotechnical Society

基　　金：江苏省自然科学基金(BK20231500);徐州市基础研究计划(KC22046)资助项目。

摘　　要：三相CLLC谐振变换器凭借其高效率、大容量、低器件应力等优势而受到广泛关注。然而,多相结构的磁性元件数量多、体积大,是制约功率变换器尺寸的主要因素。随着宽禁带(WBG)半导体器件的出现,功率变换器的开关频率显著提高,这也为印制电路板(PCB)绕组的使用提供了有利条件。与传统绕线式绕组相比,PCB绕组的扁平特性更适用于平面磁性元件。此外,由于高频带来的低电感需求也使得基于PCB绕组的平面磁性元件更有利于实现集成。该文提出一种新型的基于PCB绕组的电感和变压器的集成结构,详细分析磁心结构的磁路模型,并给出集成磁件的优化设计方法,最后通过搭建一台基于SiC器件的800 V/10 kW的实验样机进行验证。实验结果表明,该集成方案可有效减小变换器的体积和损耗,具有高功率密度和高效率。The three-phase CLLC resonant converter has attracted widespread attention due to its high efficiency,high capacity,and low device stress.However,the large number and volume of magnetic components in multi-phase structures are the main factors limiting the size of power converters.With the development of wide band gap devices,the switching frequency of power converters has significantly increased,providing favorable conditions for the utilization of PCB windings.The flat characteristics of PCB windings are more suitable for planar magnetic components.Additionally,the low inductance demand brought about by high frequencies also makes PCB-based planar magnetic components more advantageous for integration.Some integrated schemes have achieved the integration of all magnetic elements and the controllability of leakage inductance,but their structure resulted in the asymmetry of magnetic resistance.Some other studies have proposed a symmetrical integrated scheme that achieved the complete symmetry of magnetic resistance,but the leakage inductance obtained by the integration method was restricted.In this paper,a“cylindrical”planar magnetic core structure based on a three-phase CLLC resonant converter is proposed to realize the integration of magnetic elements and improve the power density of the system.The magnetic core structure is entirely symmetrical in space,achieving the symmetry of magnetic resistance and enhancing the stability of the system.Fig.A1 shows our topology structure and integrated magnetic core structure(including the planar structure diagram).The proposed integrated magnetics consists of the magnetic lid,magnetic plate,PCB winding,and magnetic base.Firstly,according to the equivalent circuit of the three-phase CLLC resonant converter,its gain characteristics are derived,and the prototype parameters are reasonably designed according to the relationship between the gain curve and K,Q values.Then,based on the proposed integrated magnetic core structure,a magnetic circuit model is established.The rela

关 键 词：三相CLLC谐振变换器 PCB绕组 磁集成 优化设计 

分 类 号：TM46[电气工程—电器]