Prof R T KennedyEMC & COMPLIANCE ENGINEERING 1 EET 422 EMC & COMPLIANCE ENGINEERING

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 2 Electromagnetic Compatibility (EMC) the ability of electronic equipment to operate or function without degradation or error and NOT be an interference source in its intended operating or EM environment

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 4 ?!?!?!?!??? E M ?

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 5 FIELD THEORY  Electric Field (E) force created by uneven charge distribution  Magnetic Field Intensity (H) force created by moving charges  Electromagnetic Field created whenever charges are accelerated

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 6 NEAR FIELDS and FAR FIELDS ~ I V E H HIGH IMPEDANCE ELECTRIC FIELD SOURCE HIGH VOLTAGE LOW CURRENT

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 7 NEAR FIELDS and FAR FIELDS ~ V I H E SOURCE LOW VOLTAGE HIGH CURRENT LOW IMPEDANCE MAGNETIC FIELD

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 10 WAVE IMPEDANCE Z Zo = 377 

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 11 WAVE IMPEDANCE APPROXIMATION

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 12 JAMES CLERK MAXWELL

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 13 JAMES CLERK MAXWELL

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 14 Electromagnetic Interference (EMI) any unwanted signal that adversely affects a device or system operation

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 16 INTRINSICNATURAL MAN MADE WANTED UNWANTED atmospheric solar cosmic ESD components transmitters radio & TV mobiles SMPS light dimmers fluorescents

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 17 ‘WANTED’ RF EMITTERS Radio and TV Stations Mobile phone networks Police and other radio networks Radar

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 18 ‘UNWANTED’ RF EMITTERS Electronic equipment Industrial machinery Electrical tools Medical diagnosis and treatment equipment

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 19 RF Reception Annoying noise Loss of sensitivity Jamming Data upset Data link disruption Control signal errors Power variations Power levels outside range Sense line feedback errors Analog signal errors Measurement errors Signal-to-noise degradation Equipment damage Circuit malfunction Physical damage

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 20 RF TRANSMISSION CONDUCTION RADIATION

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 21 E ‘STRAY CAPACITANCE’

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 22 H M ‘MUTUAL INDUCTANCE’

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 23 GROUNDING PROBLEM VCVC ZCZC

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 24 COUPLING MECHANISMS L N PE CAPACITIVE COUPLING parallel lines DIRECT COUPLING radiation GALVANIC COUPLING common earth INDUCTIVE COUPLING parasitic inductance

Unintentional radiation - DM IC i(t) Radiated emission caused by a loop current Loop area: A  Dag Björklöf H [A/m]  I * A * f 2

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 26 DIRECT RADIATION

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 27 RADIATION FROM CABLES

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 28 CONDUCTED ALONG CABLES

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 29 Indirect Direct LIGHTNING & PULSE SOURCES

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 33 SOURCEVICTIM B a C D A

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 34 EMISSIONS: SUSCEPTIBILITY: IMMUNITY NOISE SOURCE SUSCEPTIBLE RECEPTOR radiated emissions radiated susceptibility conducted susceptibility conducted emissions (CULPRIT)(VICTIM)

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 35 SOURCES Electric Fields (E) Magnetic Fields (H) E FIELD RECEPTORS CAPACITANCE (PARASITIC ) RECEPTORS E & H FIELD H FIELD RECEPTORS INDUCTANCE (PARASITIC & MUTUAL) E H NEAR FIELD FAR FIELD

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 38 How Does EMI Affect Electronics? Radiated SusceptibilityRadiated Emissions Conducted Susceptibility Conducted Emissions

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 39 TV RECEPTION: INTERFERENCE

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 40 TV RECEPTION INTERFERENCE

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 43 SOURCE RECEPTOR SOURCE RECEPTOR

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 48 SYSTEM COMPATIBILITY ?  does not cause interference to other systems  is not susceptible to other system’s emissions  does not cause interference to itself

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 50 suppress the emissions at source make the coupling path inefficient make the receptor less emission susceptible

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 52 isolation (physical separation) limiting circuit bandwidth filtering grounding SHEILDING

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 53 MICHAEL FARADAY

Prof R T KennedyEMC & COMPLIANCE ENGINEERING 54 Electric Field Coupling + - E-Field Metal Sphere V=0 + Field Terminations on Inside

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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 69 YOU STAY IN BOAT ? SWIM to LAND ? INVERT BOAT & DIVE UNDER?