This document discusses electromagnetic interference (EMI) and electromagnetic compatibility (EMC). It defines EMI as an electromagnetic disturbance that can degrade or cause malfunctions in electronic equipment. EMC is described as a state where devices function satisfactorily in a common electromagnetic environment without introducing intolerable interference to other systems. The primary mechanisms of EMI transmission are radiation and conduction from the source to the receptor. The document also outlines different types of EMI based on causes, duration, and bandwidth, and lists some effects of radiation on the human body.

1. EC8072
ELECTROMAGNETIC INTERFERENCE
AND COMPATIBILITY
PREPARED BY
R.PONNI ,AP/ECE

2. EMI- ELECTROMAGNETIC INTERFERENCE
• An Electromagnetic disturbance which may degrade
the performance of an equipment or device or
cause malfunction of the equipment is called
electromagnetic interference.
• Refers to the interaction between electric and
magnetic fields and sensitive electronic circuits
and devices.

3. EMC- ELECTROMAGNETIC COMPATIBILITY
• Electromagnetic Compatibility is a near perfect
state in which a receptor (device or system)
functions are satisfactorily in common
electromagnetic environment without introducing
intolerable electromagnetic disturbance to any
other device/ equipment/system in that
environment

4. EMC
• Electromagnetic Compatibility is a near perfect
state in which a receptor (device or system)
functions are satisfactorily in common
electromagnetic environment without introducing
intolerable electromagnetic disturbance to any
other device/ equipment/system in that
environment

5. Mechanisms of Electromagnetic
Interference (EMI)
• Electromagnetic Compatibility is a near perfect
state in which a receptor (device or system)
functions are satisfactorily in common
electromagnetic environment without introducing
intolerable electromagnetic disturbance to any
other device/ equipment/system in that
environment

6. Mechanisms of Electromagnetic
Interference (EMI)
• Path 1:Direct radiation from source to receptor.
• Path 2:Direct radiation from source picked up by the
electrical power cables or the signal/control cables
connected to the receptor , which reaches the receptor
via conduction.
• Path 3: EMI radiated by the electrical power, signal or
control cables of the source.
• Path 4:EMI directly conducted from its source to the
receptor via common electrical power supply lines or
via common signal/control cables.

7. Mechanisms of Electromagnetic
Interference (EMI)
• The primary mechanism by which EMI moves from
its source to the receptor are radiation and
conduction.
• The receptor becomes a victim when the intensity
of the EMI is above tolerable limit.

8. Mechanisms of Electromagnetic
Interference (EMI)

9. Practical experiences & concerns
EMI/EMC Interference (EMI)

10. Types of EMI
•Based on causes and problems:
1. Intra-EMI
2. Inter-EMI
•Based on the way it was created:
1.Man made EMI
2.Naturally occurring EMI

11. Types of EMI
•Based on its duration:
1.Continuous Interference
2.Impulse Interference
•Based on its bandwidth:
1.Narrowband EMI
2.Broadband EMI

12. Effects of Radiation on the human body
•Hair
•Brain
•Thyroid
•Blood system
•Heart
•Gastrointestinal tract
•Reproductive tract