AC Resistance of Inductor

It is common to see a DC resistance value for inductors in their specifications, but AC resistance is often not indicated. Sometimes you may need to consider AC resistance when working with high frequency applications.

A practical inductor includes resistance components that generate eddy current losses at the core, as well as resistance components of conductive wires that increase due to skin and proximity effects. These component are referred to as AC resistance. This AC resistance value increases in proportional to the frequencies (as per the below example), have a significant impact on power losses and increases in component temperature at high frequencies and therefore need to be taken into consideration for practical use.


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