Most electric and electronic devices—such as motors, power
supplies, and microprocessors—generate some degree of
high-frequency electromagnetic noise. Although a common issue, the
noise produced can prove to be problematic, especially in critical
operations, as it degrades the quality of signal and power
transmissions.
Electromagnetic interference (EMI) filters are one solution
industry professionals employ to mitigate the effect of
electromagnetic noise on power and signal lines. By using the
devices in their electrical and electronic equipment, they enhance
system performance by redirecting and reducing the noise by
canceling or grounding the line.
Technical Specification
- Rated voltage:250VAC/600VDC
- Rated current: 1A-300A
- Operating frequency: 50/60Hz
- Temperature range : 40/085/56
Custom EMI Filters
Our team fully understands that an off-the-shelf solution may not
be right for every customer. Fortunately, as experts in
electromagnetic interference filtration, we have the knowledge and
skills to design and build custom EMI filters to meet unique needs.
We provide full-service custom solutions, offering customer support
from project concept to project completion. Our services include
design and analysis of the filter circuit, design and layout of the
packaging, prototyping, and testing, all of which are optimized to
deliver the highest quality at the best possible price. We
accommodate custom filter designs with voltage ratings between 0 to
400 VDC and 0 to 480 VAC, current ratings between 0 to 400 A, and
frequencies up to 400 Hz. Higher ranges are also available upon
request.
How Do EMI Filters Work?
EMI filters exist as separate or integrated devices in electrical
and electronic equipment. In simplest terms, within such equipment,
they act as low-pass filters for unwanted—generally
high-frequency—current. They consist of passive electrical
components—including inductors and capacitors—that, when assembled
together, form a complete LC circuit. The inductor component allows
low-frequency and DC currents to pass through uninhibited and
blocks high-frequency current (i.e., the noise). Once blocked, the
low impedance path provided by the capacitor component directs the
noise back into the power supply or a grounded connection.
Since EMI filters are only capable of diverting conducted
interference, the devices are often combined with shielding and
insulation components to block radiated noise that travels through
the air. Radiated interference is especially a concern when there
is a significant length of conductor between the filter and the
interference source. If there is only a short length of wire
between the filter and the noise source, the EMI filter alone may
suffice.
