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Common Mode Noise Characteristics of Resonant Converters

Fig. 1. dv/dt of a resonant converter.
The CM noise characteristics of resonant converters are investigated. Noise sources of CM EMI in isolated resonant converters were identified and analyzed. The effects of the power transformer are modeled. It was discovered that utilizing the leakage inductance in the power transformer as the resonant inductor can reduce the high-frequency CM noise of some types of resonant converters.

Fig. 2. CM noise with integrated leakage.
Fig. 3. CM noise with cancellation.