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Technical Lecture

Parasitics Extraction and Optimization

T20.7 - Improvement of CM EMI Attenuation Ability of Transformer with Negative Capacitor

Wednesday, March 19, 2025
4:00 PM – 4:20 PM ET
Location: Level Three, A312
Firstly, a third-order CM model of the transformer is derived and verified from the two coupled windings and the six-capacitor model, which has the advantage of a wider effective frequency range compared to the two-capacitor CM model. Furthermore, the proposed model can be used to explain the failure of the capacitance balance technique. Finally, with the understanding of the failure mechanism, a negative capacitor is applied to extend the effective frequency range of the capacitance balancing technique, which is verified by experiments.