摘要
双向CLLC谐振变换器高效率的自然软开关特性使其在新能源发电和直流输配电领域优势明显。本文首先对双向CLLC谐振变换器的原理和特性进行分析，导出交流等效模型和直流特性，并分析参数对变换器性能的影响，在欠谐振模式下分析参数对谐振电流的影响，为参数的优化设计提供条件。 然后针对交错并联双向CLLC谐振变换器中磁件集成的问题，提出一种新型变压器磁集成结构——“[+]”型变压器集成结构，通过和传统“EE”型变压器集成结构进行对比，建立磁位差模型，分析两者磁通密度分布情况和磁位差的区别，得出“[+]”型变压器集成结构比“EE”型变压器集成结构磁通密度分布更均匀，磁位差小，散磁通造成的涡流损耗小的优势。建立磁路电路模型，给出集成变压器设计方法，并运用Ansys软件中的电磁组件进行磁通密度和磁通分布的仿真分析，通过仿真分析得出“EE”型变压器集成结构磁通密度分布不均匀，旁路磁通和扩散磁通严重，验证了理论分析的正确性。进行集成变压器样机的制作，得出集成后变压器体积减小40%，提高了变换器的功率密度，说明变压器集成优势明显。 接着给出双向CLLC谐振变换器两个ZVS实现条件和增益单调性要求，针对直直变换器系统，指出仅仅增大励磁电感对变换器效率提升有限，忽略了频率范围对变换器效率的影响。给出优化的参数设计方法，即在满足满载最大增益的条件下，选取最大励磁电感和最小k值限定工作频率范围，使变换器更加靠近完全谐振状态，同时保证了谐振变换器ZVS 和ZCS特性，使变换器在整个负载范围内具有更高的效率，特别是满载情况下，效率提升明显。
最后通过Saber仿真证明参数设计的有效性，搭建实验系统并设计系统硬件电路，通过实验证明参数优化后的效率提升明显，“[+]”型变压器集成结构具有更高的效率和功率密度。
该论文有图58幅，表6个，参考文献55篇。
关键词：交错并联；双向CLLC；磁集成
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Abstract
The high efficiency natural soft-switching characteristics of bidirectional CLLC resonant converter make it have obvious advantages in the field of new energy power generation and DC transmission and distribution.The principle and characteristics of bidirectional CLLC resonant converter are analyzed, the AC equivalent model and DC characteristics are derived, and the influence of parameters on the performance of the converter is analyzed, and the influence of parameters on resonant current is analyzed in underresonant mode. It provides conditions for the optimal design of parameters.
Then, aiming at the problem of magnetic integration in staggered parallel bidirectional CLLC resonan
t converter, a new type of transformer magnetic integration structure, "[+]" transformer integration structure, is proposed, which is compared with the traditional "EE" transformer integration structure. The magnetic potential difference model is established, and the difference between the magnetic flux density distribution and the magnetic potential difference is analyzed. It is concluded that the magnetic flux density distribution of the "[+]" transformer integrated structure is more uniform and the magnetic potential difference is smaller than that of the "EE" transformer integrated structure. The advantage of low Eddy current loss caused by dispersion Flux. The magnetic circuit model is established, the design method of integrated transformer is given, and the magnetic flux density and flux distribution are simulated and analyzed by using the electromagnetic components in Ansys software. The simulation results show that the flux density distribution of the integrated structure of "EE" transformer is uneven, and the bypass flux and diffusion flux are serious, which verifies the correctness of the theoretical analysis. The prototype of the integrated transformer is made, and it is concluded that the volume of the transformer is reduced by 40%, and the power density of the converter is improved, which shows that the advantages of transformer integration are obvious.
Then two ZVS implementation conditions and gain monotonicity requirements of bidirectional CLLC resonant converter are given. for DC / DC converter system, it is pointed out that only increasing exc
itation inductance has a limited effect on converter efficiency and neglects the influence of frequency range on converter efficiency. The optimized parameter design method is given, that is, under the condition of satisfying the maximum gain of full load, the maximum excitation inductance and the minimum k value are selected to limit the operating frequency range, so that the converter is closer to the full resonance state. At the same time, the
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ZVS and ZCS characteristics of the resonant converter are guaranteed, and the efficiency of the converter is improved obviously in the whole load range, especially in the case of full load.
Finally, the effectiveness of parameter design is proved by Saber simulation, and the experimental system is built and the hardware circuit of the system is designed. The experimental results show that the efficiency of parameter optimization is improved obviously. The "[+]" transformer integrated structure has higher efficiency and power density.
The thesis has 58 charts, 6 tables and 55 references.
Keywords: ：interleave；bidirectional CLLC；magnetic integration
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目录
摘要 (Ⅰ)
目录 (Ⅳ)
图清单 (Ⅷ)
表清单 (Ⅻ)
变量注释表.............................................................. X III 1 绪论 (1)
1.1 课题研究背景及意义 (1)
1.2 双向LLC谐振变换器的研究现状 (2)
1.3 交错并联技术概述 (3)
1.4 磁集成概述及研究现状 (4)
1.5 本文研究的主要内容 (5)
2 交错并联双向CLLC谐振变换器的原理分析 (6)
2.1 双向CLLC谐振变换器工作原理分析 (6)
2.2 交错并联双向CLLC谐振变换器的工作过程 (7)
2.3 双向CLLC谐振变换器直流特性分析 (10)
2.4 参数对变换器性能的影响 (11)
2.5 本章小结 (14)
3 交错并联双向CLLC谐振变换器的变压器集成设计 (15)
3.1 “[+]”型集成变压器分析 (15)
3.2 “[+]”和“EE”型集成变压器的参数设计 (20)
3.3 变压器集成样机制作 (23)
3.4 变压器集成仿真验证 (24)
3.5 本章小结 (27)
4 交错并联双向CLLC谐振变换器的参数设计 (28)
4.1 谐振网络参数设计 (28)
4.2 谐振电感设计 (35)
4.3 主电路器件的选择 (35)
4.4 本章小结 (37)
IV
5 系统仿真与实验验证 (38)
5.1仿真分析 (38)
5.2 实验系统设计 (40)
5.3 实验结果 (42)
5.4 本章小结 (47)
6 结论与展望 (48)
6.1 结论 (48)
6.2 展望 (48)
参考文献 (50)
作者简历 (53)
学位论文原创性声明 (54)
学位论文数据集 (55)
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