2.sources emi principles
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EMI Sources & EMC
Technologies
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- un amenta s o
Coupling of EMI
Electrostatic discharge
EMI in circuits and systems
Transients in power supply lines Nonlinearities in circuits
ass ve n er-mo u a on
Crosstalk in transmission lines
Illustrative examples
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stur ance Any electromagnetic phenomenon that may degrade
the performance of a devise, equipment, or system, or adversely affect
living or inert matter (an electromagnetic disturbance may bee ec romagne c no se, an un-wan e s gna , or a c ange n e propaga on
medium itself)
EM interference Degradation of the performance of a device, equipment,or system caused by an electromagnetic disturbance
EM compatibility The ability of a device, equipment, or system to function
satisfactorily in its electromagnetic environment without introducing
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Sources of EMI
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EM Fields
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EM Fields (contd.)
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Acetate
Asbestos
ar ru er
Mylar
Epoxy glass
Human hair
Nylon
Wool
, ,
Brass, Stainless steel
Synthetic rubber
Acrylic
Fur
Lead
Silk
Polystyrene foam
Polyurethane foam
Polyester
um num
Paper
Polyurethane
Cotton
aran
Polyethylene
Polypropylene
PVC Vin l
Wool
Steel
Sealing wax
Teflon
Silicon Rubber
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rans en over-vo ages pro a y as a resu o erres r a p enomena suc
as lightning
Radiation from strong radar/radio/communication transmissions within the
vicinity, which are picked up by the power transmission lines
Sudden decrease or increase in the mains voltage (caused by the switchingof low impedance loads)
Burst of high frequency noise (probably due to switching of reactive loads)
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A nearby lightning strike to objects
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The rapid drop of voltage
A direct lightning strike to high-voltagerimar circuits
Lightning strikes the secondary circuits
e y
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Sur e volta es from li htnin
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Transients due to Li htnin
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Minor switching near the point of interest
Periodic transients (voltage notching) that occureach cycle during the commutation in electronic
power converters
Multiple re-ignitions or re-strikes during a switcho eration
Major power system switching disturbances
,
arcing faults
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Passive Intermodulation (Materials and
Practices for reducing PIM)
ver p ate type connectors avo ow-pressure contacts
Terminations or attenuators made with alloys or oxides of non-
ferrous metals
Good, clean dielectric material
Smooth well-executed weld
Soft solder (satisfactory if well executed)
Clean and dry surfaces
must be rounded
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Passive Intermodulation Materials and
practices to be avoided erromagne c ma er a s even no n e cav y
Non-magnetic stainless steel
Ferromagnetic bolts Circulators, isolators made with ferrites
Terminations or attenuators made by plating nicrome or other ferromagnetic materials
Terminations or attenuators with composite resistive material
Hermetic seals (generally made with ferromagnetic materials)
Strip-line components (unsatisfactory, probably due to sharp edges or conductive
strip)
at ng over erromagnet c sur aces (even a thick fiber cannot guarantee
suppression of PIM)
Dielectrics loaded with conductive powder granules (contacts between granules
Multi-layer thermal wrap made of aluminum-coated Mylar (not to be used in high
strength RF field areas)
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SI anal sis - model
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C t lk
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Cross talk
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(contd)
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(contd)
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