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This paper is devoted to a detailed experimentally based analysis of applicability of vector network analyzers for measuring impedance of surface mount inductors with and without DC bias. The measurements are made using custom-made bias tees and a test fixture with an ordinary vector network analyzer. The main attention in the analysis is focused on measurement accuracy of an impedance of surface...
This paper presents 3D electromagnetic modelling of surface mount (SM) capacitors and the mutual couplings between them. 3D electromagnetic modelling software CST MWS is used for this purpose. Various SM multi-layer ceramic capacitor models are proposed and modelled. The modelling results are then verified experimentally. Comparison of the modelling and experimental results in terms of transmission...
Mutual couplings between EMI filter components are of key concern when designing EMI filters for EMI attenuation in high frequency range. To reduce the parasitic couplings and improve EMI attenuation conductive shields can be placed between the components. This paper presents modeling and measurements of EMI filters with copper shields placed between the filter components. 3D electromagnetic field...
Modeling of differential mode EMI filter is presented in this paper. 3D electromagnetic field modeling software CST MWS is used as a simulation tool. EMI filter consisting of two capacitors and two inductors is modeled considering parasitic mutual couplings between EMI filter components. Modeling is performed for different positions of capacitors and inductors on both single-sided and double-sided...
This paper deals with modeling of differential mode Il-type EMI power filter using 3D electromagnetic field modeling software CST MWS. Two scenarios are considered: inductor is positioned in parallel or perpendicular to capacitors. Capacitor distance and PCB track layout is changed to verify software modeling precision and capabilities. Measurement and modeling results are in good agreement.
This paper deals with modeling of mutual couplings between passive EMI filter components: inductors and capacitors positioned on printed circuit board. 3D electromagnetic software CST MWS is used for the modeling. Three scenarios are considered: mutual couplings between two capacitors, mutual couplings between two inductors and mutual couplings between inductor and capacitor. Modeling results are...
This paper is devoted to EMI filter inductor modeling and mutual coupling modeling between two inductors positioned on PCB. 3D inductor models are developed and modeled in CST MWS. Comparison of inductors mutual coupling measurement and modeling results show that transfer coefficients can be predicted accurately. CST MWS has been used also to predict effective mutual coupling reduction techniques.
In this paper modeling of EMI filter capacitors and modeling of mutual couplings between them is presented. The modeling has been done using 3D electromagnetic software CST MWS. Three capacitor models have been proposed and verified experimentally. All proposed models during verification have shown that their performance is high enough to enable PCB mounted capacitor modeling and mutual inductance...
The paper considers the effect of increasing switching frequency on a frequency modulated (FM) buck converter parameters: efficiency, output voltage ripples and electromagnetic interference (EMI) attenuations. The converter operating in continuous and discontinuous conduction modes (CCM and DCM respectively) is analyzed analytically, by simulations in Simulink and experimentally. The results obtained...
In the research the examination of the methods possible to improve the implementation of spread spectrum technique for EMI reduction in switch mode power supplies are searched. The analysis of effects of switching frequency modulation in open loop boost converter reveals that there is additional undesirable amplitude modulation of the input current of the converter. This effect distorted the spectrum...
In this paper analysis of output voltage ripples of a switching frequency modulated (SFM) buck converter operating in discontinuous conduction mode (DCM) is performed. The ripples are analyzed in both time and frequency domains by the use of theoretical derivations and computer simulations. Significant increase in output voltage ripples under DCM is observed after using periodic SFM. Low frequency...
This paper presents examination of the influence of periodic switching frequency modulation in dc/dc converters on power quality on a load. The experiments are performed by the use of a buck converter which switching frequency is modulated by a sinusoidal modulating signal. The experimental results are also verified by simulations in PSpice. Analysis of the results reveals that there is increase in...
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