A Novel Approach to Reduce EMI in Switched-Mode Power Supplies Operating at Fixed Switching Frequencies

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 8Sprache: EnglischTyp: PDF

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Hubert, Florian; Dorsch, Philipp; Rupitsch, Stefan J. (Chair of Sensor Technology, University of Erlangen-Nuremberg, Germany)
Duerbaum, Thomas (Chair of Electromagnetic Fields, University of Erlangen-Nuremberg, Germany)

This contribution presents a novel approach to reduce electromagnetic interference of switched-mode power supplies. The interference reduction is based on the inverse piezoelectric effect. Providing a low-impedance propagation path for conducted emissions at a resonance frequency of a piezoelectric element, we can attenuate a discrete disturbance peak of a disturbance spectrum. We successfully integrated our novel piezoelectric EMI-filter in a flyback-converter in order to suppress a common-mode disturbance peak. Measurement results reveal that the suppression effect can be improved by 31 dB compared to a similar regular interference-suppression capacitor. Regarding the practical use of the developed piezoelectric EMI-filter, the temperature dependence is examined in addition.