Electromagnetic Interference EMI Electromagnetic Compatibility EMC

7/28/2019 Electromagnetic Interference EMI Electromagnetic Compatibility EMC

1/14

1

Technical Seminar Presentation - 2004

Devraj SabatNationalInstitu

teofScience&T

echnology Electromagnetic Interference

(EMI) & ElectromagneticCompatibility (EMC)

Presented by

Devraj Sabat

EC200117322

Under the Guidance of

Mr. N. Srinivasu


2/14

2



teofScience&T

echnology AGENDA

EMI

SOURCES OF EMI

REDUCING EMI

EMC

EMC DESIGN CONSIDERATIONS EMC & EMI TESTING


3/14

3



teofScience&T

echnology INTRODUCTION

EMI-

It consists of any unwantedconducted or radiated signals of electric origin

that can cause degradation in system orequipment performance.

EMC-It is the ability of the system to function as

designed without any degradation inperformance due to EMI with in the operationalenvironment


4/14

4



teofScience&T

echnology

Classification of EMI

INTRASYSTEM EMI-

EMI problems with in the system one isdealing with.

INTERSYSTEM EMI-

EMI problems, that occur between two ormore systems.


5/14

5



teofScience&T

echnology EMI arises due to three basic

factors

Sources Transmission Path

Response


6/14

6



teofScience&T

echnology Sources of EMI

Natural EMI sources

Man made EMI sources

Broadband EMI sources

Narrowband EMI sources

Conducted EMI sources

Radiated EMI sources


7/14

7



teofScience&T

echnology

Reduction of EMI

Both Filtering & Shielding techniques are

used to reduce electromagneticdisturbances.

To reduce noise due to EMI at sources by

EMC oscillators.


8/14

8



teofScience&T

echnology Electromagnetic compatibility

(EMC)

First, EMC implies that the equipment will not

generate unacceptable interference emissionlevels which could cause interference .

Second, EMC implies that the equipment can

tolerate ambient levels of interference

without degradation of performance


9/14

9



teofScience&T

echnology

EMC Design considerations

Connectors

Grounding Shielding

Components

Electrostatic discharge


10/14

10



teofScience&T

echnology Testing

Low level testing-

Component, Equipment, Subsystem testing

Intermediate level testing- System testing

High level testing-

Electromagnetic environment with the test

item


11/14

11



teofScience&T

echnology Testing

Compliance tests-

Performed at the end of design.

Engineering tests- Deals with potential problems in the

designing process .

Audit tests-

It is associated with manufacturing & quality


12/14

12



teofScience&T

echnology Conclusion

EMI is a major problem in the development ofsystems.

EMC must be taken in to consideration during

the design stage. Environmental reliability testing is used to

eliminate potential problems

There are many EMC standards used in theregulation of products that may cause EMI.


13/14

13



teofScience&T

echnology References

Electromagnetic Compatibility Design Guide forAvoinics and Related Ground SupportEquipment by AD NAVAIR.

Electromagnetic Compatibility, design

handbook series 1.0. A.A. Smith Jr., Coupling of Externalelectromagnetic fields to Transmission lines,John Willey & Sons.

www.google. Com Military specification, Electric Cable, Aerospace

vehicle, General specification for, MIL-C-7078,August 9, 1971.


14/14

14



teofScienc

e&T

echnology

Electromagnetic Interference EMI Electromagnetic Compatibility EMC

Documents

Transcript of Electromagnetic Interference EMI Electromagnetic Compatibility EMC