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EET 422 EMC & COMPLIANCE
ENGINEERING
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wk date TOPICS MON TUESLAB
WEDL -2hr
THU FRI SAT SUN
1 1 J-7 J 1 2 3 4 5 6 7
vacation vacation
2 8 J-14 J EMC intro- BANANA SKINS 8 9 10 RTK 11 12 13 14
MAKE UP ! -2
3 15 J-21 J EMC Concepts 15 16 17 RTK 1`8 19 20 21
EMC MCAD # 1 INDRA HATTA +1 -1 HOLIDAY
4 22 J- 28 J EMC Concepts 22 23 2 4 RTK 25 26 27 28
EMC DEMO #1 # 2 SCHAFFNER Prof HOLTZ -1
5 29 J- 4 F EMC Directive, Standards Routes to Compliance
29 30 31 RTK
1 2 3 4
EMC LAB # 1 INDRA HATTA +1 0
6 5 F- 11 F coupling & decoupling 5 6 7 RTK
8 9 10 Converters: dips, drops, ringing, notching, overlap
11
EMC MCAD #2 INDRA HATTA +1 +1
7 12 F- 18 F conducted emissions CM DM modes
12 13
14 RTK MAKE UP
15 16 17 18
EMC LAB # 2 INDRA HATTA -2 -1
-1 make up after CHNY CHNY
8 19 F- 25 F SEMESTER BREAK 19 CHNY 20 21 22 23 24 25
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wk date TOPICS MON TUESLAB
WEDL -2hr
THU FRI SAT SUN
8 19 F- 25 F SEMESTER BREAK 19 CHNY 20 21 22 23 24 25
9 26 F- 4 M grounding 26 27 28 RTK 1 2 3 4
EMC LAB # 3 INDRA HATTA
10 5 M-11 M active & passive components 5 6 7 RTK 8 9 10 11
LIT EMC LAB PRACTICAL TEST INDRA HATTA
11 12 M-18 M signal spectra 12 13 14 RTK
15 16 17 18
EMC LAB #4 INDRA HATTA TEST REVISION
12 19 M-25 M SMPS 19 20 21 RTK
22 23 24 25
TEST EMC MCAD #3 INDRA HATTA TEST REVISION TEST
13 26 M-1 A DRIVES 26 27 28 RTK
29 30 31 HOLIDAY 1
EMC LAB # 5 INDRA HATTA
14 2 A-8 A ANALOGUE CIRCUITS 2 3 4 RTK
5 6 7 8
EMC LAB # 6 INDRA HATTA
15 9 A- 15 A EMC related directives 9 10 11 RTK
12 13 14 15
EMC LAB THEORY TEST
16 16 A- 22 A reading week - revision 16 17 18 19 20 21 22
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TEXTBOOK REFERENCES
M I Montrose: E M Nakauchi IEEE 2004 “Testing for EMC Compliance: Approaches and Techniques”
T Williams 3rd Ed Newnes 2001/3
“EMC for Product Designers”
T Williams K Armstrong Newnes 2000 “EMC for Systems and Installations”
D Lohbeck Newnes 1998“CE Marking”
NOTE: THESE TEXTBOOKS ARE RECOMMENDED READING ONLY
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SAMPLE WEB SITES
http://www.nutwooduk.co.uk/free_registration.asp
http://www.cherryclough.com
http://www.iec.ch/zone/emc/
http://www.ce-mag.com
http://ec.europa.eu/enterprise/electr_equipment/emc/index.htm
http://www.sirim.my/InfoFusion/SNQ/sept04.pdf
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COURSEWORK
MCAD EMC LAB EMC LAB TESTS LIT
EXAM TEST assignments PERFORMANCE PRACTICAL THEORY SEARCH
50% 10% 10% 10% 10% 5% 5%
submit hard copy at end of lab
assessed at end of lab
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prepare a report based
literature search
&
measurements demos
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“The need for EMC regulations
and
Test Methods for Conducted and Radiated Emissions”
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TESEQ (SCHAFFNER) EMC DEMOS
wk date time TITLE venue
4 Mon 22J 9.00 1pm EMC PLV TRAINING PE LAB
4 Mon 22J 2.00-3.00 INTRODUCTORY EMC TALK ? all students
3.15-5.00 DEMO: conducted emissions testing PE LAB GP 1
5.15-7.00 DEMO: conducted emissions testing PE LAB GP 2
4 Tues 23J 8.30- 10.15 DEMO: conducted emissions testing PE LAB GP 3
10.30-12 .15 DEMO: radiated emissions testing PE LAB GP 1
1.15-3.00 DEMO: radiated emissions testing PE LAB GP 2
3.15-5.15 DEMO: radiated emissions testing PE LAB GP 3
6.30 Q& A ? all students
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wk date expt. # TITLE submit results wkg groups
1 1 J-7 J
2 8 J-14 J
3 15 J-21 J emc mcad #1 POWER SUPPLY LINE CURRENT HARMONICS week # 3 INDIVIDUAL
4
22 J- 28 J emc demo #1emc demo #2
conducted emissions testingradiated emissions testing
GROUPS X3
5 29 J- 4 F emc lab #1 POWER SUPPLY INPUT STAGE week # 2 GROUP X2
6 5 F- 11 F emc mcad #2 CONVERTER LINE CURRENT HARMONICS week # 5 INDIVIDUAL
7 12 F- 18 F emc lab #2 AC-dc ac-ac converter LINE CURRENT HARMONICS
week # 6 INDIVIDUAL
8 19 F- 25 F SEMESTER BREAK GROUP X2
9 26 F- 4 M emc lab #3 AC-dc converter DIPS RINGING NOTCHING OVERLAP
week # 7 GROUP X2
10 5 M-11 M emc test EMC LAB PRACTICAL TEST INDIVIDUAL
11 12 M-18 M emc lab #4 COMPONENT EVALUATION week # 9 GROUP X2
12 19 M-25 M emc mcad #3 SIGNAL SPECTRA week # 11 INDIVIDUAL
13 26 M-1 A emc lab #5 SIGNAL SPECTRA week # 12 GROUP X2
14 2 A-8 A emc lab #6 LINE FILTERS week # 13 GROUP X2
15 9 A- 15 A emc test EMC LAB THEORY TEST INDIVIDUAL
16 16 A- 22 A READING WEEK
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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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?!?!?!?!??? E M ?
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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
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NEAR FIELDS and FAR FIELDS
~
I
V
E
H
HIGH IMPEDANCE ELECTRIC FIELD
SOURCE
HIGH VOLTAGE LOW CURRENT
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NEAR FIELDS and FAR FIELDS
~
V
IH
E
SOURCE
LOW VOLTAGE HIGH CURRENT
LOW IMPEDANCE MAGNETIC FIELD
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Er r( )Zo
2
I l cos
r2
1j
k r
ej k r
E r( )j Zo k
4
I l sin r
1j
k r
1
k r( )2
ej k r
H r( )j k
4
I l sin r
1j
k r
ej k r
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Hr r( )j k
2
I A cos
r2
1j
k r
ej k r
H r( )k
2
4
I A sin r
1j
k r
1
k r( )2
ej k r
E r( )Zo k
2
4
I A sin r
1j
k r
ej k r
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WAVE IMPEDANCE
Z 3
1
rE
21
rH
31
rH
21
rE
rH
1
rE
1
rH
1
rE
1
2rboundary
H
EZ
Zo = 377
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WAVE IMPEDANCE APPROXIMATION
0.1 1 10 10010
100
1 103
1 104
EM WAVE IMPEDANCE APPROXIMATION
)(rZH
)(rZE
oZ
2
r
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JAMES CLERK MAXWELL
1831-1879
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Electromagnetic Interference (EMI) any unwanted signal
that adversely affects a device or system operation
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INTRINSIC NATURAL
MAN MADE
WANTED
UNWANTED
atmospheric
solar
cosmic
ESD
components
transmitters
radio & TV
mobiles
SMPS
light dimmers
fluorescents
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IndirectDirect
LIGHTNING & PULSE SOURCES
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• 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
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SOURCE
VICTIM
B
A
C
D
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EMISSIONS: SUSCEPTIBILITY: IMMUNITY
NOISE SOURCE
SUSCEPTIBLE RECEPTOR
radiatedemissions
radiatedsusceptibilit
y
conductedsusceptibili
ty
conductedemissions
(CULPRIT)
(VICTIM)
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How Does EMI Affect Electronics?
Radiated Susceptibility Radiated Emissions
Conducted Susceptibility Conducted Emissions
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TV RECEPTION INTERFERENCE
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E
‘STRAY CAPACITANCE’
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H
M
‘MUTUAL INDUCTANCE’
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GROUNDING PROBLEM
VC
ZC
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SOURCES
Electric Fields (E)
Magnetic Fields (H)
E FIELD RECEPTORS
CAPACITANCE(PARASITIC & MUTUAL)
RECEPTORS
E & M FIELD
H FIELD RECEPTORS
INDUCTANCE(PARASITIC &
MUTUAL)
E
H
NEAR FIELD
FAR FIELD
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SOURCE
RECEPTOR
SOURCE
RECEPTOR
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SYSTEM COMPATIBILITY ?
does not cause interference to other systemsis not susceptible to other system’s emissions does not cause interference to itself
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suppress the emissions at source
make the coupling path inefficient
make the receptor less emission susceptible
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• isolation (physical separation)
• limiting circuit bandwidth
• filtering
• grounding • SHEILDING
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MICHAEL FARADAY
1791 -1867
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Electric Field Coupling+ -
E-Field
+ -+
Metal Sphere
V=0
+
Field Terminations on Inside
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