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A Design Method for the Three-Winding Transformer with Enhanced Insulation in the Half-Bridge LLC Configuration | IEEE Conference Publication | IEEE Xplore

A Design Method for the Three-Winding Transformer with Enhanced Insulation in the Half-Bridge LLC Configuration


Abstract:

With the increasing application of multi-port converters in electrical engineering, the design demand for multi-winding transformers is also rapidly rising. The complex e...Show More

Abstract:

With the increasing application of multi-port converters in electrical engineering, the design demand for multi-winding transformers is also rapidly rising. The complex electromagnetic parameters and structural optimization of multi-winding transformers have become a significant engineering challenge. Additionally, as the voltage levels of power electronic converters increase, managing the enhanced insulation levels of transformers while addressing the resulting increase in leakage inductance has become another critical issue. This study focuses on a three-winding transformer within a half-bridge LLC topology. Using an iterative approach that combines parameter calculation and software simulation, we optimize the transformer model by adjusting the winding arrangement to balance insulation and leakage inductance. The goal is to enhance the insulation capability of the transformer while achieving balanced leakage inductance between the two equivalent windings of the three-winding transformer. The effectiveness of the calculation method and design scheme is validated through simulation analysis and experimental testing.
Date of Conference: 08-11 November 2024
Date Added to IEEE Xplore: 17 December 2024
ISBN Information:
Conference Location: Xi'an, China

I. Introduction

Nowadays, there are many types of topologies using multi-winding transformers, but most control strategies focus on controlling the switching frequency and bridge arm phase shift [1]–[2]. The leakage inductance of the transformer, which is part of the resonant inductance, plays an important role in influencing the voltage gain. If the leakage inductance between different windings is inconsistent, the voltage gain on the different input and output sides will deviate significantly with varying load sizes. Thus, multi-winding transformers have strict requirements for balancing leakage inductance between different primary and secondary windings.

References

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