The easiest way of preventing EMI is to enclose the electrical equipment (if
possible) in a metal case. This is popularly known as 'Faraday Cage' and is
good at minimizing Radiated Interference (RMI). Additionally, most electrical
and electronic systems need a sequence of Inductor-Capacitor (LC) filters to
remove EMI. These filters are called as Feed-through (FT) capacitors and FT
filters.
FEEDTHROUGH FILTERS: A feed-through device consisting of an inductor
positioned between two capacitors connected to the ground. L, T, LL and Pi are
different types of feed-through filters.
Performance characteristics:
- Provides filtering in high frequency ranges (> 1 GHz)
- Can provide EMI protection in standard, high and extended performance
ranges
- 10 – 300 A, 130 V DC / 250 V AC
- FT capacitor performance increases with higher frequency, thus
providing better cost benefit
- FT filters can be used when higher performance is required over broad
range of frequencies
- FT filters have better performance than FT capacitors when the noise
source impedance is less than 50 Ohms
Applications of FT Filters:
- Home appliances
- Telecom Systems - Base Station Racks, Routers, Broadband
Communications
- Medical Systems - MRI Rooms, Screened rooms
- Power Systems - Main Power Supplies, Power Amplifiers and generators,
high current SMPS
- Industrial Systems - High Frequency welding equipment, Rolling Mills,
Variable Speed Drives, Frequency converters, Electric drives. Industrial
controls
- Military Systems - Military vehicles and equipment
- Office Automation
- Non-Conventional Energy
Why EMIS?
- EMIS feed-through components support a wide range of current ratings,
capacitance, thread sizes and mounting options
- Components are compact in size, have high contact reliability and are
easy to install
- EMIS filters are available in voltage ratings of 110/230/440/520/680
VAC & with current rating up to 2500Amps
- EMIS developed Military grade Chamber filters with >80dB suppression
from 14KHz to 30GHz. Filters rated for 400Hz AC applications are also
covered in this range. These products are under safety certification.
- EMIS filters have International Safety Certification as per CSA/C-US
/NEMKO. EMIS is the only brand manufactured in India with this
Certification.
- EMIS is associated with Indian Military R&D in developing and certifying
HEMP filters rated up to 1500amps in 3ph AC as per MIL 188-125.
- EMIS has developed Power line feed through Capacitors & feed through
filters Up to 600 Amps for 250V AC application. These are approved by
both Indian & international customers and are available as filter plates.
These products are under safety certification.
- Custom built feed-through components are available at customer
request.
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