Fully-integrated Planar Transformer with a Segmental Shunt for LLC Resonant Converters
Fully-integrated Planar Transformer with a Segmental Shunt for LLC Resonant Converters
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DOI：
10.1109/tie.2021.3116574
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发表时间：
2021
影响因子：
7.7
通讯作者：
Sajad A. Ansari;J. Davidson;M. Foster
中科院分区：
文献类型：
--
作者：
Sajad A. Ansari;J. Davidson;M. Foster
本文提出了两种拓扑结构，提供高漏感并联插入集成磁变压器。这些与传统设计的不同之处在于，用由许多小气隙分隔的高导磁率磁分路段代替了平面Transformer的低导磁率磁分路。这种方法导致具有与常规设计相同的体磁导率的分流器，同时使用较低成本和容易获得的磁性材料，例如铁氧体。为每种拓扑结构提供了一种建模和设计方法，可以精确地估计泄漏和磁化电感。理论分析，并验证了有限元分析和实验实施。还介绍了两种Transformer拓扑结构的交流电阻分析。此外，LLC谐振变换器的建立，以验证所提出的全集成磁变压器在实践中的性能。结果表明，所提出的拓扑结构可以集成所有三个磁组件的隔离LLC谐振转换器在一个单一的平面Transformer，这减少了转换器的体积和成本。
This paper presents two topologies which provide high leakage inductance in shunt-inserted integrated magnetic transformers. These differ from conventional designs by replacing the low-permeability magnetic shunt of a planar transformer with high-permeability magnetic shunt segments, separated by many small air gaps. This approach results in a shunt with the same bulk permeability as the conventional design, while using lower cost and readily available magnetic materials such as ferrite. A modelling and design approach which can estimate the leakage and magnetising inductances precisely is provided for each topology. Theoretical analysis is presented and verified using finite-element analysis and experimental implementation. AC resistance analysis for both transformer topologies is also presented. In addition, an LLC resonant converter is built to verify the performance of the proposed fully-integrated magnetic transformers in practice. It is shown that the proposed topologies can integrate all three magnetic components of an isolated LLC resonant converter in a single planar transformer, which reduces the converters volume and cost.