7/29/2019 3.Emi System
1/36
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=13748136755325987/29/2019 3.Emi System
2/36
7/29/2019 3.Emi System
3/36
Interference
7/29/2019 3.Emi System
4/36
EMI Categories
7/29/2019 3.Emi System
5/36
Interference Fully opposed
Fully opposed signal
7/29/2019 3.Emi System
6/36
Interference Partially opposed
Partially opposed signal
7/29/2019 3.Emi System
7/36
Interference is the combination of two or more waves
to form a composite(mixed) wave.
PROPERTY OF EMI
7/29/2019 3.Emi System
8/36
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
7/29/2019 3.Emi System
9/36
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
7/29/2019 3.Emi System
10/36
Aspects of EMC
7/29/2019 3.Emi System
11/36
1) It describes the ability of an electrical or electronic
system to operate without interfering to other system.
Aspects of EMC
7/29/2019 3.Emi System
12/36
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
7/29/2019 3.Emi System
13/36
REASONS FOR COMPLIANCE
Regulatory Requirements
Domestic EMC: FCC Requirements
Penalties:
$7000/occurrence Bellcore
European: EMC: EMC Directive
Military/Aerospace Functionality and Mission Success
7/29/2019 3.Emi System
14/36
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
7/29/2019 3.Emi System
15/36
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
7/29/2019 3.Emi System
16/36
A system is electromagnetically compatible
if-
7/29/2019 3.Emi System
17/36
A system is electromagnetically compatible
if-
-It does not cause interference to other systems.
7/29/2019 3.Emi System
18/36
A system is electromagnetically compatible
if-
-It does not cause interference to other systems.
-It is not susceptible to emissions by othersystems.
7/29/2019 3.Emi System
19/36
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.
7/29/2019 3.Emi System
20/36
Thanks
Series 1
Series 30123
45
Series 1
Series 2
Series 3
7/29/2019 3.Emi System
21/36
Types of EMI
7/29/2019 3.Emi System
22/36
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.
7/29/2019 3.Emi System
23/36
EMI EMI
EMI
EMI
7/29/2019 3.Emi System
24/36
EMI
EMI
7/29/2019 3.Emi System
25/36
7/29/2019 3.Emi System
26/36
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
7/29/2019 3.Emi System
27/36
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..
7/29/2019 3.Emi System
28/36
Precautions at source side
7/29/2019 3.Emi System
29/36
7/29/2019 3.Emi System
30/36
Test Categories
Conducted emissions (CE)
Radiated emissions (RE)
Conducted susceptibility (CS)
Radiated susceptibility (RS)
7/29/2019 3.Emi System
31/36
7/29/2019 3.Emi System
32/36
7/29/2019 3.Emi System
33/36
7/29/2019 3.Emi System
34/36
7/29/2019 3.Emi System
35/36
7/29/2019 3.Emi System
36/36
22 September 2013 37
Thank You