Analysis, Design and Modelling of Two Fully- Integrated Transformers with Segmental Magnetic Shunt for LLC Resonant Converters
Analysis, Design and Modelling of Two Fully- Integrated Transformers with Segmental Magnetic Shunt for LLC Resonant Converters
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用于 LLC 谐振转换器的具有分段磁分流器的两个完全集成变压器的分析、设计和建模
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Foster
中科院分区：
文献类型：
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作者：
Sajad A. Ansari;J. Davidson;M. Foster
为了实现用于集成磁Transformer的精确、高漏电感，通常将磁分路（基于低磁导率材料）添加到平面Transformer。然而，高性能低磁导率功率材料在市场上并不容易获得。为此，本文提出了两种新型并联插入式平面Transformer拓扑结构。在所提出的拓扑结构中，磁分流器基于高磁导率材料，如广泛可用的铁氧体，并使用多个小间隙来近似低磁导率材料，作为低磁导率磁分流器的替代方案。详细介绍了所提出的平面变压器的分析、设计和建模。结果表明，垂直气隙可以控制磁化电感，分流器厚度可以控制漏感值。因此，可以获得用于集成Transformer的期望的漏电感和磁化电感值以用于LLC谐振转换器。通过有限元分析（FEA）验证了理论分析，并讨论了所提出的拓扑结构的交流电阻。
To achieve a precise, high leakage inductance for an integrated magnetic transformer, a magnetic shunt (based on low- permeability materials) is usually added to the planar transformer. However, high-performance low-permeability power materials are not readily available in the market. Therefore, two new topologies for shunt-inserted planar transformer are proposed in this paper. In the proposed topologies, the magnetic shunts are based on high-permeability materials like ferrite, which is widely available, and use multiple small gaps to approximate a low-permeability material as an alternative to a low-permeability magnetic shunt. The analysis, design and modelling of the proposed planar transformers are presented in detail. It is shown that the magnetizing inductance can be controlled by vertical air gaps and the leakage inductance value can be controlled by the thickness of the shunt. Hence, the desirable leakage inductance and magnetizing inductance values for the integrated transformer can be obtained for use in LLC resonant converters. The theoretical analyses are verified by finite element analysis (FEA) and the AC resistance for the proposed topologies is discussed.