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Cable ferrites are noise suppression components acting as a common-mode filter. In former work a new characterization method for cable ferrites, using a TEM waveguide, was described. It provides a new set of more representative ferrite parameters. From these parameters, the impedance of the currently widely used wire-loop setup measurement can be derived as well as for other terminations of the wire...
The application of the stripline for immunity tests is described in the standard DIN ISO 11452-5. In this paper the electrical characteristics of the stripline and the related limitations were determined. At certain frequencies high field strengths were measured beyond the test volume. This limits the application of a stripline for immunity tests, which causes additional stress to the periphery and...
A highly detailed evaluation of the influence of parasitic elements, e.g. semiconductor inductances and heat sink capacitances, on radio frequency noise of a power electronic circuit is presented, using measurements in time domain. Fast switching semiconductors trigger oscillations during the switching process, that are critical under electromagnetic interference (EMI) considerations. Separate equivalent...
Cable ferrites are widely used on wires attached to electronic devices and components to fulfill the requirements of the EMC regulations. Until today many manufacturers of those passive components refer to a simple measurement procedure in order to obtain a ferrite-impedance-versus-frequency-chart for their datasheets. This setup renders only a special case for the cable termination which is far away...
The standard IEC 61000–4–20 describes the test procedures in coaxial transmission lines, including a so called correlation method, in order to compare emission test results measured in a GTEM cell with the limits given by the product standard. One parameter that has to be taken into account is the directivity of the test object, characterizing its radiation pattern. The standard assumes a constant...
The prediction of the differential mode (DM) noise resonances of a switching mode power supply (SMPS) is important before prototyping. It requires an appropriate model of the SMPS which considers various frequency-dependent effects. This paper explains the influence of resonances on the conducted DM noise of SMPS by using a new model in the frequency domain. The paths of the DM currents before and...
The prediction of the common mode (CM) noise resonances of a switching mode power supply (SMPS) is important before prototyping. It requires an appropriate model of the SMPS which considers various frequency-dependent effects. This paper explains the influence of resonances on the conducted CM noise of SMPS by using two models in the frequency domain. The impact of changing parasitic inductance and...
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