Common mode chokes are used in order to filter common mode
electromagnetic interference (EMI) currents without de-rating under high currents
and without causing signal degradation. Common mode chokes are applied to supply
and return pairs of conductors and are ideal for EMI filtering of signal and
power lines. Common mode chokes can
withstand high DC currents without filtering performance degradation, which is
an issue that can happen with differential mode filters such as small chip
beads.
https://www.futureelectronics.com/c/passives/filters--common-mode-chokes/products
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