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EMI/EMC

SYSTEM

By KK Sawant , Assistant Professor, EE DEPT.

TOPIC-2

http://www.google.co.in/url?sa=i&source=images&cd=&cad=rja&docid=SYtBfYoV0epSCM&tbnid=x3RlDeDtehM5hM:&ved=0CAgQjRwwAA&url=http://www.bubblews.com/news/499336-benefits-of-lightning&ei=a6zwUYebG4vArAfngIGQCA&psig=AFQjCNHqy3gZEiq4tfXs2ngSfaDWGTqDAw&ust=1374813675532598http://www.google.co.in/url?sa=i&source=images&cd=&cad=rja&docid=SYtBfYoV0epSCM&tbnid=x3RlDeDtehM5hM:&ved=0CAgQjRwwAA&url=http://www.bubblews.com/news/499336-benefits-of-lightning&ei=a6zwUYebG4vArAfngIGQCA&psig=AFQjCNHqy3gZEiq4tfXs2ngSfaDWGTqDAw&ust=1374813675532598http://www.google.co.in/url?sa=i&source=images&cd=&cad=rja&docid=SYtBfYoV0epSCM&tbnid=x3RlDeDtehM5hM:&ved=0CAgQjRwwAA&url=http://www.bubblews.com/news/499336-benefits-of-lightning&ei=a6zwUYebG4vArAfngIGQCA&psig=AFQjCNHqy3gZEiq4tfXs2ngSfaDWGTqDAw&ust=1374813675532598http://www.google.co.in/url?sa=i&source=images&cd=&cad=rja&docid=SYtBfYoV0epSCM&tbnid=x3RlDeDtehM5hM:&ved=0CAgQjRwwAA&url=http://www.bubblews.com/news/499336-benefits-of-lightning&ei=a6zwUYebG4vArAfngIGQCA&psig=AFQjCNHqy3gZEiq4tfXs2ngSfaDWGTqDAw&ust=1374813675532598http://www.google.co.in/url?sa=i&source=images&cd=&cad=rja&docid=SYtBfYoV0epSCM&tbnid=x3RlDeDtehM5hM:&ved=0CAgQjRwwAA&url=http://www.bubblews.com/news/499336-benefits-of-lightning&ei=a6zwUYebG4vArAfngIGQCA&psig=AFQjCNHqy3gZEiq4tfXs2ngSfaDWGTqDAw&ust=1374813675532598http://www.google.co.in/url?sa=i&source=images&cd=&cad=rja&docid=SYtBfYoV0epSCM&tbnid=x3RlDeDtehM5hM:&ved=0CAgQjRwwAA&url=http://www.bubblews.com/news/499336-benefits-of-lightning&ei=a6zwUYebG4vArAfngIGQCA&psig=AFQjCNHqy3gZEiq4tfXs2ngSfaDWGTqDAw&ust=1374813675532598

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Interference

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EMI Categories

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Interference Fully opposed

Fully opposed signal

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Interference Partially opposed

Partially opposed signal

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Interference is the combination of two or more waves

to form a composite(mixed) wave.

PROPERTY OF EMI

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Interference is the combination of two or more waves

to form a composite(mixed) wave.

PROPERTY OF EMI

- based on the phase angle theta of two EM waves

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Interference can be equal/ to signal/match level of signal

Interference can (DESTRUCTIVE)destroy the signal completely

Interference is the combination of two or more waves

to form a composite(mixed) wave.

PROPERTY OF EMI

- based on the phase angle theta of two EM waves

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Aspects of EMC

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1) It describes the ability of an electrical or electronic

system to operate without interfering to other system.

Aspects of EMC

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1) It describes the ability of an electrical or electronic

system to operate without interfering to other system.

2) It also describes the ability of such systems to operateas intended within a specified electromagnetic

environment.

Aspects of EMC

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REASONS FOR COMPLIANCE

Regulatory Requirements

Domestic EMC: FCC Requirements

Penalties:

$7000/occurrence Bellcore

European: EMC: EMC Directive

Military/Aerospace Functionality and Mission Success

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THE EMC DIRECTIVE

89/336/EEC: The EMC Directive Adopted 1989 by Council of the European Communities

Original Implementation 1 January 1992

Amended by 92/31/EEC

Affects all products to be placed on the Market

Calls out essential protection requirements which includeemissions as well as susceptibility

Does not call out specifications or standards

New Approach Directive Essential Protection Requirements

Allows Self-Certification

CEMarking certifying products conformance

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APPLICATION OF

THE EMC DIRECTIVE

Electrical Apparatus Covered Exceptions: components, large installations and devices

that must comply with other Directives that addressEMC (e.g., telecommunications)

Member states adopt ENs

Penalties for non-compliance

Country-by-Country basis. Example: UK Requirements:

Fines up to 5000

Up to 3 months imprisonment for misuse of CE mark

Forfeiture of equipment

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A system is electromagnetically compatible

if-

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A system is electromagnetically compatible

if-

-It does not cause interference to other systems.

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A system is electromagnetically compatible

if-

-It does not cause interference to other systems.

-It is not susceptible to emissions by othersystems.

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A system is electromagnetically compatible

if-

-It does not cause interference to other systems.

-It is not susceptible to emissions by othersystems.

-It does not cause interference with itself.

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Thanks

Series 1

Series 30123

45

Series 1

Series 2

Series 3

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Types of EMI

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Types of EMI

Radiative EMI :Any Electrical or electromechanical

devices, including motors, power lines, antennas,

traces on a PCB, and even the silicon components

on the PCB.Conductive EMI : This EMI primarily shows itself as

electrical noise on the power supply lines of an

application and can be caused by induced voltagespikes from other devices within a system.

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EMI EMI

EMI

EMI

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EMI

EMI

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EMC problems

Common examples:

-Lines across the face of a TV screen when blender or vacuum

cleaner is working.

- Damage to the telephone and electronic devices due to lightninginduced surges on the lines.

- Computer interferes with the radio and TV reception.

- Screen on the video display jitters when the fluorescent lights are

on.

Cont..

U l

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Uncommon examples:

In Germany, a Wireless mobile car near opposite: a high power

broadcast transmitter -interference.

Operating cellular phones: laptop computers and other

electronic devices in an aircraft can cause interference to

aircraft's communication systems and rudder (steering) control.

Cellular telephone calls: interferes with the pacemaker of a heart

patient.

A dentists drill: begin to operate when the receptionist in the

adjacent room operate the cellular phone.

Cont..

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Precautions at source side

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Test Categories

Conducted emissions (CE)

Radiated emissions (RE)

Conducted susceptibility (CS)

Radiated susceptibility (RS)

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22 September 2013 37

Thank You