Contractual requirements imply or specify filters.Įssentially, an AC power or mains EMI filter is a low pass filter that blocks the flow of “noise” while passing the desired input which can be DC or 50/60/400 Hertz power frequency. Even for military/aerospace equipment, they must be protected from failure due to EMI noise and security requirements may call for filters to protect classified data. Designers often forget that an EMI filter can assist in meeting immunity and fast transients requirements and radiated emissions as well. One reason is that regulatory agency requirements dictate that conducted and radiated emissions be constrained below specified limits, but the unit must also pass immunity/transient requirements. However, for this article, we will focus on the AC/Mains EMI ( Electro Magnetic Interference) power type filter. The general term filter, of course, can also be used for a device on control and signal type lines. Filters accept an electrical signal at its input and deliver a different or modified signal at its output depending upon the filters internal configuration. The term “signal” can be a communication or power type signal. It is a device usually composed of discrete components which can be placed between circuits, networks, or equipment/systems to either emphasize, de-emphasize or control the frequency components of a desired or undesired signal. To start at the very beginning, what is an electrical filter? An electrical filter can be passive, active, analog, or digital.
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