Almost no electrical device is immune to EMI (electromagnetic interference), causing an unwanted electrical noise. The purpose of line filters is to reduce this noise (sometimes known as RFI – radio frequency interference) as much as possible. 

At AEPS group, we supply line filters capable of reliably serving in a variety of devices and industries.

  • Filtration modules for both AC and DC networks
  • Capable of functioning in almost all temperatures and climatic conditions
  • Amorphous nanocrystal line cores ensure efficient filtering
  • Rigorously tested for quality and safety

 

Ensure a smooth working of your device and get rid of unwanted interference by introducing the line filter into an equation. Your network alone might not be sufficient to protect your equipment from harm.

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Line filters suited for AC

Harsh environments are no obstacle to the proper functioning of our JETAF series AC power filters (and indeed all of our products). Suited for use in AC networks, they are an indispensable help in the protection of both analog and digital equipment, keeping it safe from surges and filtering noises in the modules and power supply units.

Their common mode chokes contain amorphous nanocrystal line cores, resulting in smooth filtering and improved temperature stability.

  • Nominal current of our JETAF series filters ranges from 1 A to 20 A
  • Case operating temperature range extremes are -50 °C to +85 °C
  • Overvoltage protection (voltage suppression)
  • For best performance, combining these with our AC/DC power supplies is recommended

With the exception of the JETAF15-400 filter, our AC power line noise filters are meant to be used in single phase AC systems. These filters, namely JETAF 1, 5, 10 and 20, uniformly have the following insertion loss (you can read more about insertion loss below later on):

Frequency range and insertion loss

0.15-0.3 MHz

≥20 dB

0.3-1 MHz

≥35 dB

1-10 MHz

≥55 dB

10-30 MHz

≥50 dB

The JETAF15-400 is designed to be used in AC 3-phase networks and its insertion losses are as follows:

Frequency range and insertion loss

0.15-0.3 MHz

≥55 dB

0.3-1 MHz

≥60 dB

1-10 MHz

≥30 dB

10-30 MHz

≥20 dB

 

Not just AC line filters – we got the DC covered as well

As with all our devices, the DC line filters are highly durable and can endure extreme conditions with relative ease. Designed for operation in DC networks, they will achieve their full potential when working together with our DC/DC power supplies and DC/DC converters. But of course they are compatible with most of the other off-the-shelf devices on the market as well.

  • Nominal current of the JETDF series filters ranges from 2.5 A to 20 A
  • Case operating temperature range extremes range from -60 °C to 130 °C
  • Protected from overvoltage

These are the insertion losses in our JETDF line surge filters:

Frequency range and insertion loss

0.15-0.3 MHz

≥15 dB

0.3-1 MHz

≥35 dB

1-10 MHz

≥55 dB

10-30 MHz

≥50 dB

 

Improve EMC profile to achieve better characteristics for EN-55022 and MIL-STD-461, improve performance of your electric devices, and protect them from unwanted signals that may result in damage. Our line filters are just the tool to do it.

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Let’s take a closer look at what makes the power line filters so useful

And there’s no better place to start than looking at the nature of the electromagnetic interference (EMI) itself.

Quite simply, EMI (or RFI – radio frequency interference) is an unwanted signal or disturbance coming from an external source (be it natural man-made), which is capable of negatively affecting an electrical circuit. The effects of the disturbance may range from decreased performance to the complete disabling of the circuit. There are various sources of electromagnetic interference and various ways to categorise it based on its effects. A good electrical power filter should be able to mitigate the effects of many of them.

The effectiveness of the filter is measured by the so-called insertion loss.

 

What is insertion loss in the DC or AC noise filter context?

The insertion loss refers to the loss of signal resulting from introducing the filter into the transmission line. The loss is formulated as the ratio of the signal at the filter input to the signal at its output. The loss values differ according to the frequency of the signal, and sometimes as a result of external factors (for example high temperature). It is measured in decibels (dB).

While the term loss usually has negative connotations, in this case, it is actually a beneficial thing, since it is the unwanted EMI signals that are being reduced. These signals can take on many forms, which we’ll take a look at right away.

 

Which types of interference can be encountered that require a power line noise filter?

First, the interference might be categorised by its origin.

  • Man-made EMI. This noise can originate from other devices or be produced in the circuit itself, particularly as a result of fast switching in switch-mode power supplies.
  • Natural EMI. Lightning strikes or cosmic noise can both act as a source of electronic disturbance.

Alternatively, one can look at it in terms of its duration, irrespective of its origins.

  • Impulse noise is short-lived, and can originate from both natural and man-made sources. Lightning, electrostatic discharge and complications in switching systems can all count as impulse noise.
  • Continuous EMI typically has its origins in circuits which produce continuous signal, or, in some of the more rare cases, in persistent background noise.

The noise can also be divided in terms of its bandwidth.

  • Narrowband noise. This noise occupies only a small part of the radio spectrum. It might be both continuous and impulsive, with its source being typically man-made (power line hums, local oscillators, etc.).
  • Broadband noise. This signal will occupy a much larger portion of the spectrum, possibly hundreds or more megahertz, and can come both as continuous, impulse or transient noise. Among its typical sources are unintentional radar transmitters, voltage regulators, thermostats or even the Sun.

 

Would you like to inform yourself more about how our filters can help you with a particular type of noise? Contact us and we’ll gladly elaborate!

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Consider the ways through which the electric noises reach the device

An important question to ask is whether the EMI is radiated from outside, that is, if the source of it and the end device are in no way connected. Handling the radiated EMI is, typically not the question of a proper line filter but rather of proper shielding.

In the case of conducted EMI, on the other hand, there is a direct conduction route through which the noise is able to travel – typically a power cable. That is where line filters tend to prove the most useful.

A third route through which the noise might travel is through magnetic induction and capacitive coupling. The first one occurs when there is a magnetic field between the source of the noise and the “victim” This might happen when their conductors are too close, thus inducing the current in the circuitry where it shouldn’t be. Capacitive coupling happens when the source transfers a charge to the victim circuitry while changing voltage.

 

The amount of noise is subject to regulations – EMI line filters are therefore necessary

Mitigating the noise is not only done to protect the device from malfunction or damage. Oftentimes, it is directly required by law, setting a limit on the amount of emitted noise. The majority of countries today mandate the so-called electromagnetic compatibility, meaning that all electronic devices must both withstand noise and do not emit it so as not to interfere with other devices.

 

With that in mind, these things need to be considered in all power filters for electronics

They should be meeting the emission limits according to the particular market – or multiple markets – they are intended to be used in. Our modules are suitable for a variety of uses in industries ranging from aeroplane, mining, UAVs, radar and IT technologies all the way to visual advertising.

To ensure that the filter is suitable for your particular needs, you should consider the following while choosing your products:

  • Rated voltage, or the maximum amount of voltage that the input can handle. Going above this value, you’re risking damaging the filter itself.
  • Rated current – the maximum current which the filter can handle within its operating temperature range.
  • Operating temperature / storage temperature. The storage temperature is a temperature in which the device can be stored without being powered. Operating temperature is a temperature at which the device actually operates. Our DC filters, for example, have an operating temperature ranging from -60°C to 130 °C.
  • Method of cooling. Our products are usually cooled conductively (via heatsink or a cold-plate) or in some cases via natural convection.
  • Safety standards and resistance against mechanical shock and vibrations. Our products meet the safety and resistance standards of both MIL-STD-810F and IEC/EN 60950-1.
  • Mean time between failures. The average time our AC filters can last without failure at 50° C temperature case is 200 000 hours. With our DC noise regulators, this value reaches 400 000 hours!

You will find the technical details covered in more depth in a datasheet attached to each of our products.

Contact us and tell us more about your project if you’re unsure which filter would suit you the most. We’ll be more than glad to help you make a more informed choice.

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