EMC at Component and PCB Level by Martin O 'Hara BSc (Hons) Applied Physics and Electronics

By Martin O 'Hara BSc (Hons) Applied Physics and Electronics MSc Physical Measurement Techniques and InstrumentationASEE Diploma in Engineering (DEM) with Honours(obtained 'Premium Award' for highest national examination mark)

This e-book presents the data and stable layout perform for the layout or try out engineer to take the required measures to enhance EMC functionality and for that reason the opportunity of accomplishing compliance, early on within the layout process.

there are various benefits for either the part provider and customer, of taking a look at EMC at part and PCB point. For the providers, not just will their items have the aggressive aspect simply because they've got identified EMC functionality, yet they are going to be ready may still EMC compliance develop into crucial sooner or later. For shoppers it's a special virtue to grasp how an element will behave inside of a procedure with reference to EMC.

Shows tips to in attaining EMC compliance early on within the layout process
Provides the data to track method EMC functionality problems
Follows most sensible layout practices

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33 Differential mode equivalent circuit T co i i v 42 EMC at Component and PCB Level be beneficial as it is unlikely that the impedance of the input mains line and system are equal. This does make frequency analysis of the filter more difficult without recourse to simulation, but allows impedance matching at both inlet and outlet terminals. For high frequency signal filtering lower value capacitors would be used. As far as the standard EMC conducted tests are concerned we know that the differential mode impedance between live and neutral is 10092 (CISPR 16 5092/50 ~H LISN).

The additional considerations in mains filter design is the earth leakage current requirement. This is a factor that should be borne in mind at each stage of design when using capacitors to provide an RF sink to a safety ground. If the safety ground or chassis is common with the mains earth then leakages must be summed to ensure the safety leakage current requirements are still met. A standard mains line filter usually consists of five components; an X class capacitor at the inlet between live and neutral (CX1), a CM choke (sometimes referred to as a current compensated choke) between inlet and outlet (L1), an X class capacitor across the outlet sockets live and neutral (CX2) and finally two Y class capacitors between the outlet sockets and earth (CY1, CY2).

The SMPS has gained popularity due to high efficiency and small size (about 10 times reduction in size compared with similar power linear designs) and not its EMC friendliness. Additional filtering will be required if using an SMPS circuit as a direct off-line supply. Even for in-board DC-DC conversion SMPS circuits produce a high conducted noise and require filter considerations (see section on DC-DC converters). The filtering required to reduce the noise from the SMPS circuit itself is usually a good filter for other incident noise generated by the target circuit or injected into the input line.

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