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BCX54 Datasheet(PDF) 3 Page - EPCOS |
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BCX54 Datasheet(HTML) 3 Page - EPCOS |
3 / 22 page 11 04/00 s Unsymmetrical interference: – This term is used to describe interference on a single line, relative to the reference potential (fig. 1c) 1.4.2 Characteristics of interferences In order to be able to choose the correct EMC measures, we need to know the characteristics of the interferences, how they are propagated and the mechanisms by which they are coupled into the cir- cuit. In principle, the interferences can also be classified according to their range (fig. 2). At low fre- quencies, it can be assumed that the interference only spreads along conductive structures, at high frequencies only by means of electromagnetic radiation. In the MHz frequency range, the term cou- pling is generally used to describe the mechanism. Analogously, conducted interference on lines at frequencies of up to several hundred kHz are main- ly symmetrical ( differential mode), at higher frequencies, they are asymmetrical (common mode). This is because the coupling factor and the effects of parasitic capacitance and inductance between the conductors increase with frequency. X capacitors and single chokes are suitable as suppression measures for the differential mode com- ponents. Where asymmetrical, i.e. common-mode interference has to be eliminated, current-com- pensated chokes and Y capacitors are mainly used, the prerequisite for this being, however, a well- designed, EMC-compliant grounding and wiring system. The categorization of types of interference and suppression measures and their relation to the fre- quency ranges is reflected in the frequency limits for interference voltage and interference field strength measurements. Fig. 2 Frequency range overview Pc ch. = Iron powder core chokes, but also all single chokes/ X cap = X capacitors Cc ch. = Current-compensated chokes / Y cap = Y capacitors Y cap Cc ch. Interference voltage 10 Max. ratings 10 2 _ 10 1 _ characteristic Interference propagation Interference Remedies Pc ch. Line Differential mode X cap Field strength 0 10 1 10 2 SSB1558-D MHz 10 3 Shielding Field Field Coupling Ground Common mode f General Technical Information |
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