Jak To Działa - Kompatybilność Elektromagnetyczna

Jak To Działa - Kompatybilność Elektromagnetyczna
Understanding EMI & EMC
What is EMI ?
Inspection Arch
Three Factor EMI/EMC
Electronics
Grounding
Cell Phone
Power Line
Connector
Lightening
Antenna
Path
Anachoic Chamber
?
Measurement Chamber with antenna
Electromagnetic Interference (EMI)
LISN
Sensitive Device
Cell Phone
Inductively coupled (magnetic field)
Diode
Capacitively coupled (Electric Field)
Antenna
Radiated (Electromagnetic field)
People
EMI Test : It is evaluated whether the radiated emission or the conducted emission discharged from the
EUT (Equipment Under Test) exceeds the limit value set beforehand.
Conducted Susceptibility
Transistor
Conducted (Electric Current)
Electromagnetic Susceptibility (EMS)
EMS Test : It evaluates whether EUT causes the malfunction by a peripheral electromagnetic radiation.
Spectrum Analyzer
Radiated Susceptibility
Potentially
Susceptible
Component
Potentially
Susceptible
Component
Suppression of EMI
Protect against Radio Waves, Microwaves & Power Lines
Using Filters
Effects of EMI
Ferrite Bead
Equipment under Test
?
A disturbing sound when talking on landline and your cell
phone rings.
?
Computer interfering with FM radio reception.
Shielded Cover
OR Protected Room
?
Operating vacuum cleaner causing “snow” on TV.
?
A shaky computer screen when your cell phone rings.
?
A buzzing car radio when you drive below a high
power line.
?
Your system reboots when you change the speed of
overhead fan with electronic regulator.
Electrostatic Discharge
Power Disturbance
Flicker and Harmonics
Cost of Addressig EMC
Using Shielding
?
A passing aeroplane causing disturbance in radio or
television transmission.
Classification of EMI
?
Use a low
impedance cover
?
Make good
connections between different parts of cover
?
Make many
smaller holes instead of one big
?
Use conductive
Radiated emissions
No Paint
Low Z
foil with a plastic cover
Use smaller holes
Broadband
?
Noisy
Component
?
Intentional
?
Un intentional
Shield
?
Conducted
?
Radiated
Electromagnetic Compatibility is related to the design of a product which will not get affected by external
Electromagnetic radiation and it will also not affect any other product due to its own electromagnetic
effects.
EMC pursues two issues
Cover
Narrow band
?
What is EMC?
Connect Shield
to
Reference
Cost of Addressing EMC Issues
Interference Source
Measurement of EMI
Analysis Software
Electromagnetic interference or EMI, is an unwanted disturbance that
affects an electrical circuit due to electromagnetic radiation emitted from
an external source. The disturbance may interrupt, obstruct, or
otherwise degrade or limit the effective performance of the circuit. The
source may be any object, artificial or natural, that carries rapidly
changing electrical currents, such as an electrical circuit, the Sun or the
Northern Lights.EMI is everywhere and it affects our equipment,
business atmospheres, and even our health. As power densities and
communication speeds increase in new systems, EMI is created in
normally compatible situations.
Learning
Shield
Conducted emissions
?
Intersystem
Noisy
Component
?
Intra system
?
Natural
?
Man made
SR
Connect
Shield to System
Reference
Concept l
Design l
Layout l
Prototype l
Testing l
Production
SR
Regulations
FCC-Federal Communications Commission
IEC - International Electrotechnical Commission
l
Military l
Medical l
Vehicular l
Other
For more information & EMI/EMC Solutions please contact
Scientech Technologies Pvt. Ltd. 94, Electronic Complex, Pardesipura, Indore-452010 India.
+91-731-4211100,
[email protected]
www.ScientechLearning.com
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