Mutual couplings between EMI filter components

Buesink

2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE

2016

To reduce common mode(CM) and differential mode(DM) interference, a DM/CM integrated filter is often required to reduce the level of interference. This paper will show coupling from a Common Mode Choke(CMC) into Cx capacitors can decrease the DM-filtering performance significantly at high frequencies. By retrieving equivalent circuit parameters from a 3D EM field simulation of the components, and include these parameters in the circuit simulator, an optimal capacitor orientation is determined. The optimized placement results in a 15 dB improvement between 5 MHz and 200 MHz.

“…The 3D EM-field simulation have been carried out on the simplified inductor model shown in [11] and the simplified capacitor model described in [15]. The models are sketched in Fig.…”

Section: B Field Simulationmentioning

confidence: 99%

Optimizing capacitor placement in EMI-filter using back annotation of 3D field coupling parameters in circuit models

Buesink

2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE

2016

“…Studies like [2], emphasize often on mathematical solutions for complex filtering architectures that will predict or estimate performance over an as wide as possible frequency range. Similarly, a trend can be seen in the rise of awareness of mutual coupling effects becoming more dominant in degrading the performance of filters consisting of passive components [3], [4], and thus geometry and placement being of utmost importance [5]. A systematic approach in EMI filter design can be found in [6], where the measurements have shown a SMPS that exceeds the limit lines in nearly the entire frequency range of the CISPR 22 class B limit.…”

Section: Introductionmentioning

confidence: 99%

Practical Consideration on Power Line Filter Design and Implementation

Nemashkalo

2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE

2020

Electromagnetic interference filters have been studied extensively and proven to be a complex subject, with no single easy solution or rule of thumb. Typical filtering solutions for differential mode disturbances originating from a switched mode power supply are investigated in this paper. A simple T-shape filter model is used to derive an insertion loss equation that is dependent on source and load impedance, which allows to predict filter performance in more realistic settings compared to typical 50/50 Ω measurement setups. It concurs with observations made in a case study that changing filter orientation could increase filter performance.

“…[11] showed by measuring scattering parameters between different components, that one can determine mutual coupling effects and add these to the equivalent circuit simulation. From this point on [12] has shown that it is possible to determine the mutual coupling This paper focuses on the automated extraction of circuit model parameters using a Gauss-Newton algorithm for the purpose of back-annotating this into a system equivalent circuit simulation. The main problem to be addressed is the accurate representation of impedances into equivalent circuits.…”

Section: Introductionmentioning

confidence: 99%

Automated equivalent circuit extraction of impedance curves using a Gauss-Newton algorithm

Rotgerink

2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Comp

2018

In this study, an algorithm has been implemented to automate the extraction of passive component values from impedance curves. The method has been applied to a Common Mode (CM) filter. The novelty of this paper lies in the possibility to fit any equivalent circuit to any impedance curve with a relative efficient algorithm. This allows for back-annotation of fields into equivalent circuit simulators.