A line filter is the kind of electronic filter that is placed between electronic equipment and a line external to it to attenuate conducted radio frequencies rfi also known as electromagnetic interference emi between the line and the equipment.
Ac power line filter schematic.
One major reason for installing a filter directly at the power entry point is the suppression of the conducted emissions that would otherwise be injected directly onto the power lines.
In particular an ac line filter is used between the ac power line and the equipment smps or an electronic circuit.
According to the characteristics of emi at the power port the emi line filter is a passive low pass filter which transmits ac to the power supply without attenuation and greatly attenuates.
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Passive power lines filters are now present in almost all domestics and industrial applications.
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Indeed you can consider the output capacitors part of a filter that reacts against the output impedance of the power supply circuit.
These ripple components are removed by placing a filter circuit at the output of the rectifier.
Increasing the value of the output capacitance will reduce noise.
It consists of a desired dc component of voltage and b unwanted ripple components.
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Cmn can be suppressed by the use of inductors within an emi filter that are placed in series with each power line and by y capacitors that are connected from both power line conductors to ground.
Many generic emi suppression filters work well only in emc test labs but do little or even can boost emi in real life installations see here why cleansweep patented power line noise filters block emi on real life power lines both common mode and differential mode and uniquely in ground.
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Power line filters are generally designed as passive filters composed of resistors capacitors and inductors without active components like transistors.