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

Conference: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/07/2019 - 05/09/2019 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2019

Pages: 8Language: englishTyp: PDF

Personal VDE Members are entitled to a 10% discount on this title

Authors:
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)

Abstract:
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.