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Andreas Nadler - Field Application Engineer
Andreas Nadler
Mains Filter
17. May 2024
Reading time: 10 Min.

Line filter – The last barrier in the switch mode power supply

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Desk with electronic components

1-phase mains filter design

How can the power grid be protected from unwanted interference caused by a connected device? This application note describes the steps required to create a suitably dimensioned mains filter.

To avoid unwanted interference in the power grid, a mains filter is often required to suppress interference signals generated by a connected load. This application note explains the steps required to design a suitably dimensioned mains filter.

Simulations and measurements are used to compare discrete versions of a single- and two-stage mains filter. In addition, the different core materials of current-compensated chokes and their properties are explained.

 

Contents:

  • Common mode, differential mode and LISN (Line Impedance Stabilization Network)
  • Calculation of a one- and two-stage line filter
  • Circuit simulation and realization
  • Comparative measurements in the EMC chamber
  • Calculations of varistor, leakage current and discharge resistance
  • Mains filter layout and component selection
  • Core materials for current-compensated chokes

 

Download: ANP015

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