A Novel Design for a 3.6 KW LLC Transformer with Tight Tolerance, Primary Side Concentrated Leakage Inductance to Replace a Discrete Resonant Inductor for Improved EV/HEV Onboard Charger performance

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 5Sprache: EnglischTyp: PDF

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Healy, Gerard (Pulse Electronics, Ireland)
Wang, Tyler (Pulse Electronics, China)

The benefits of the LLC topology for multi-KW On Board Charger (OBC) applications are well understood with the resonant inductor facilitating zero volt switching operation. The LLC transformer leakage inductance can replace a discrete resonant inductor if the value can be correctly sized and with the required tight tolerance. A novel construction is presented to achieve these requirements. Finite element analysis modelling (FEM) demonstrates how this leakage inductance is concentrated on the primary side for optimized performance. This analysis is validated with transformer measurement data and further verified by converter performance.