A Scalable Matrix Integrated Transformer with Controllable Leakage Inductance for a Bi-Directional Resonant Converter

Integrated transformer with built-in leakage inductors is a good approach for simplifying the whole system, as it integrates discrete leakage inductors into the transformer with printed circuit board (PCB) windings for a single-phase CLLC (1PCLLC) resonant converter. The EI-core-based integrated tra...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2023-09, Vol.38 (9), p.1-17
Main Authors: Jin, Feng, Nabih, Ahmed, Li, Zheqing, Li, Qiang
Format: Article
Language:English
Subjects:
Asymmetry
CLLC
Coils (windings)
Controllability
Core loss
Inductance
Inductors
Leakage
Legged locomotion
magnetic integration
Matrix converters
onboard charger
printed circuit board (PCB) transformer
Transformer cores
Transformers
Widebandgap device
Windings
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Summary:Integrated transformer with built-in leakage inductors is a good approach for simplifying the whole system, as it integrates discrete leakage inductors into the transformer with printed circuit board (PCB) windings for a single-phase CLLC (1PCLLC) resonant converter. The EI-core-based integrated transformer can integrate adjustable leakage inductance into the transformer. Series or parallel connections of EI-core-based integrated transformers offer a possible solution for high-voltage and high-power applications: however, the penalty of more considerable core loss by the induced leakage flux is problematic. This paper proposes a matrix integrated transformer with controllable leakage inductance for a 1PCLLC resonant converter. Three EI-core-based elemental integrated transformers can be integrated into one three-UI-core-based integrated transformer with built-in leakage inductance, and the benefits of evenly distributed flux inside the core and much-reduced core loss can be achieved. An asymmetrical winding structure and asymmetrical core structure were proposed to adjust the built-in leakage inductance for the proposed matrix integrated transformer. An 11-kW 1PCLLC resonant converter for 800-V onboard-charger application was built to verify the proposed novel matrix integrated transformer. The designed converter can achieve a power density of 250W/in 3 power density and 98.4% peak efficiency.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2023.3270400