Abstract
This paper investigates the radiated electromagnetic interference (EMI) in non-isolated power converters for automotive applications. The radiated EMI is mainly caused by the cable antenna radiation. The mechanism of the cable antenna radiation is the common mode (CM) noise propagating through the power cables and radiating to space. The radiation excitation noise is generated by the non-isolated power converter. Through the noise circuit of the non-isolated power converter, the initial switching noises transform to the radiation excitation source. To develop the model for characterizing the generation of the radiation excitation source, this paper analyzes the noise circuit and the noise transformation in the non-isolated power converter. And based on the analyses of the noise circuit, this paper investigates the critical parasitics in the non-isolated power converter. Simulation and experimental investigations of the radiated EMI and the noise sources are conducted.
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