University of Twente Student Theses
Optimizing EMI Filter Performance Through Capacitor Placement and Orientation
Buzogány, C. (2024) Optimizing EMI Filter Performance Through Capacitor Placement and Orientation.
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| Abstract: | This paper investigates methods to enhance the performance of EMI filters without significant modifications to their design, focusing specifically on the placement and orientation of the capacitors. A simplified Shunt Capacitor (SC) filter with two capacitors was used to determine the best capacitor placement, reducing the need for complex simulations of full EMI filters. Key couplings within different layouts of the SC filter were identified, analytically calculated, and input into an LTspice simulation model to assess the performance of the different layouts. These simulations were validated against actual measurements, and the resulting filter performances were evaluated based on their high-frequency attenuations. It was found that replacing a single capacitor with two parallel capacitors improves performance, but placing capacitors in an antiparallel configuration yields the best results, achieving an 11 dB increase in attenuation above 50 MHz. This antiparallel layout offers the highest performance with minimal space requirements, making it an optimal solution for larger EMI filters. Attempts to apply these findings to a more complex Common Mode (CM) filter, consisting of two capacitors and a common mode choke, revealed limitations due to the lack of an accurate analytical model for the choke. Consequently, simulation results did not align with measurements, indicating the need for more precise modelling, possibly through 3D simulation software. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/101007 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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