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Universidade do Estado de Santa Catarina, Programa de Pós-Graduação em Engenharia Elétrica, Santa Catarina, Brasil
2 Universidade Regional de Blumenau, Departamento de Engenharia de Telecomunicações, Elétrica e Mecânica, Santa Catarina, Brasil
ABSTRACT Electromagnetic interference filter design specifies circuit topology and elements, inductors, and capacitors of an electrical network whose purpose is to reduce interferential signals. This work presents an iterative methodology of EMI filter design for switched power supplies based on the sequential element theorem and the concept of the dominant effect in electromagnetic compatibility. This design methodology was proposed based on experiments with three commercial off-the-shelf power supplies and knowledge about common, differential, and mixed-mode emissions, as well as the non-idealities of the elements and the power supply's input impedance characteristics. In practical tests, the effect of the EMI filter resonance and the power supply's mixed-mode input impedance was observed, which served as a guideline for determining which component should be included or whether its value should be increased in the EMI filter structure. The most restrictive requirements were met with a few iterations and fewer components than the original filters, demonstrating that the concepts used as a reference are valid and valuable.
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