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A Single Phase CLLC Resonant Converter with a Novel Matrix Integrated Transformer

Year: 2023 | Author: Feng Jin | Paper: H3.3
Topology of 1PCLLC resonant converter
Fig. 1. Topology of 1PCLLC resonant converter with integrated transformer.
  The integrated transformer that has 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, as shown in Fig. 1. The EI-core-based integrated transformer can integrate adjustable leakage inductance into the transformer; however, the penalty of considerable core loss caused by the induced leakage flux is problematic. Series or parallel connections of EI-core-based integrated transformers offer a possible solution for high-voltage and high-power applications. This paper proposes a novel matrix integrated transformer with built-in 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, as shown in Fig. 2. An 11kW 1PCLLC resonant converter for an 800V onboard-charger application was built to verify the proposed novel matrix integrated transformer. The designed converter can achieve a 250W/in3 power density and 98.4% peak efficiency.

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