Symmetrical Termination Structure for Matrix Transformer in High Power Density Applications

High-frequency resonant converters with PCB-based transformers are extensively used in data centers and automotive industries due to increasing demands for high power density and efficiency. Within the discourse concerning the reduction of losses at the secondary side, the significance of shortening the current loop and minimizing parasitic inductance among output capacitors has been subject to in-depth exploration. Building upon these foundations, this paper introduces a more precise terminal model, offering a deeper analysis of the conditions for capacitors ringing oscillation, while emphasizing the neglected importance of symmetry in the design process. Modeling results indicate that optimizing terminal resistances with consideration for both symmetry and the reduction of parasitic inductance results in a substantial reduction. In this study, the optimized terminal resistance can be lowered to a remarkable 34% of the original design, significantly enhancing the overall efficiency of the converter.