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ELECTROMAGNETIC

COMPATIBILITY

Dr. Donald ChurchSenior Staff Enineer

International Rectifier Auto!oti"e S#$te!$

November 17, 2005

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Electromagnetic Compatibility

Outline

Introduction: Terms & Definitions

EMC in Product Development: Activities & Outputs

EMC in te Automotive Environment: Callenges

E!ample: Electro"#ydraulic Po$er %teering %ystem

EMC and te IEEE: Education

uestions

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E'ECT(OMA)*ETICCOMPATI+I'IT,

-EMC.

/0 Electromagnetic Emissions

,our %ystem Cannot Interfere 1it Oter

%ystems or %ubsystems in te 2eicle

-e0g03 4M (adio.0

50 Electromagnetic %usceptibility

,our %ystem Must Continue to Operate Correctly

in te Presence of Interference 4rom Oters or

Transient Disturbances0

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E'ECT(OMA)*ETIC I*TE(4E(E*CE

-EMI.

Conducted Interference

Enters6E!its on 1ires for Po$er or Control

(adiated Interference

Enters6E!its Troug te Air

Emissions Must be Controlled to Protect:

AM & 4M (adio %tations

Aircraft Communications & *avigation

Emergency %ervices 'and Communications

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EMI MEASUREMENT

7nits: d+u2

89d+u2 ;/#? @ /99M#?

%pectrum Analy?er %creen

/8u2

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EMC in Product Development

Typical Development Cycle Outputs

Product %pecification

%ystem Arcitecture

Pysical Design

Product ualification

Corresponding EMC Outputs

EMC (e=uirements Analysis

EMC Concept (evie$

EMC Design (evie$

EMC 'essons 'earned

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EMC in Product Development

Typical EMC Activities During Product Development

%pecification:

Arcitectural6%ystem Design:

Detailed Design:

Prototype6ualification:

Define te EMC re=uirements -8 types.0

1ic directives applyB

Ensure te standards are understood0

1at are te implicationsB

Propose preliminary EMC design concepts0Create te EMC test plan0

Propose PC+ design strategies0

(evie$ Po$er %tage Concept for EMC0

Do an EMC ris> analysis0

Implement te strategies and concepts0

Do pre"screening tests and simulation0

Do formal certification testing0

(e"design & (e"testB

4ailures ere are e!pensive

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EMC In Te Automotive Environment

#ars Environment

Po$er 'ine Transients

(4 Interference

Electrostatic Discarge

Po$er 'ine Electric & Magnetic 4ields

#ig (eliability

/ ppm )oal

4ail %afe is Critical

E!treme Cost %ensitivity

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EMC In Te Automotive Environment:

%usceptibility

Po$er TransientsInductive 'oad %$itcing

2oltage %ag

'oad Dump

(4 Immunity

On"+oard Transmitters

(adio %tations

Airport (adar %ystems

%ensors are Most 2ulnerable

Electrostatic Discarge -E%D.

7p to /8>2

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EMC In Te Automotive Environment:

Emissions

(adiated Emissions2ery %ensitive (eceivers

Distance to te Antenna

89d+ 'o$er Tan Commercial 'imits

Cables Are 7nintended Antennas

PC+ Traces Also (adiate

Digital Circuits Are Te Main %ource

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EMI 'esson F/: (emember 4ourier

Te Energy in a Trape?oidal 1aveform is a 4unction of te Pulse

1idt andte (ise and 4all Times0

E!ample: 59>#? $aveform $it /9ns rise & fall times0

4/ /;>#? 45 ;5M#?

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E'ECT(O"#,D(A7'IC

PO1E( %TEE(I*) %,%TEM

#ydraulic Pump

Electronic Control 7nitTree"Pase InverterMicrocontroller & %61%ensorsCA* +us

Tree"Pase +rusless

DC Motor

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Conducted Emissions (esults

Test Conditions; Typical Load, PWM @ 2!"A, #,RPM

PWM

$a%&onics

Po'e% Sta(e

) I*+

Load -ast Ed(es ) I*+

Lo' -%e./ency; #01$ ! "M$ $i(3 -%e./ency; "M$ 4 #M$

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EMC A*D T#E IEEE

Ancora Imparo4 I Am %till 'earning

Mic3elan(elo at A(e 56

IEEE EMC %ociety

IEEE Annual EMC %ymposium

*A(TE & Te IEEE EMC %ociety

4ostering and promoting Tecnical A$areness3Education and Acievement in EMC

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EMC %ummary

1at it is and $y it is important

Designing Early for EMC

EMC Callenges in te Automotive Environment

E!ample of a Certified Automotive Component

Continuing Education Troug *A(TE & IEEE

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