Prof R T KennedyEMC & COMPLIANCE ENGINEERING 1 1.

Prof R T Kennedy EMC & COMPLIANCE ENGINEERING

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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

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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


14 2 A-8 A ANALOGUE CIRCUITS 2 3 4 RTK

5 6 7 8


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

http://www.cherryclough.com/

http://www.cherryclough.com/

http://www.ce-mag.com/


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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

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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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Prof R T KennedyEMC & COMPLIANCE ENGINEERING 1 1.

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