Reducing SMPS Size and Losses with a Novel Piezoelectric EMI Filter
Conference: CIPS 2024 - 13th International Conference on Integrated Power Electronics Systems
03/12/2024 - 03/14/2024 at Düsseldorf, Germany
Proceedings: ETG-Fb. 173: CIPS 2024
Pages: 5Language: englishTyp: PDF
Authors:
Hubert, Florian (Laboratory for Electrical Instrumentation and Embedded Systems, Department of Microsystems Engineering - IMTEK, University of Freiburg, Germany & Siemens Healthineers AG, Corporate Testing Laboratory - EMC Center, Erlangen, Germany)
Kuebrich, Daniel; Duerbaum, Thomas (Institute of Optoelectronics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany)
Rupitsch, Stefan J. (Laboratory for Electrical Instrumentation and Embedded Systems, Department of Microsystems Engineering - IMTEK, University of Freiburg, Germany)
Abstract:
Switch-mode power supplies (SMPS) represent a main contributor of electromagnetic interference (EMI). Reducing the EMI filter size with minimal effort is a complex challenge for SMPS developers. To tackle this challenge, we present a new EMI filter concept based on the piezoelectric effect. By utilizing several mechanical vibration modes, multiple disturbance peaks of an interference spectrum can be suppressed. For demonstration purpose an optimized piezoelectric EMI filter is implemented in a flyback converter and the EMI suppression is investigated. In the experiment, a 36 % lower DC loss and a 55 % volume reduction could be achieved by substituting a conventional Y-capacitor with a piezoelectric EMI filter.