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Inductors - Typical Applications
Energy Storage
An inductor stores energy in the form of magnetic ?ux.
+
Vin
–
+
Vin
–
Switch On
Current through an inductor is
transformed to produce magnetic ?elds.
Inductor is charged when the circuit is
on.
When off, the inductor acts as a current
source, discharging current which ?ows
through the circuit as the magnetic ?uxes
collapse.
Noise Filters
An inductor presents a series of impedances (Z=jwL+R) to suppress electromagnetic
interference (EMI). The reactance jwL resists the ?ow of noise signal while the equivalent
loss resistance R of core material absorbs the undesired signal.
L
Signal laden with noise
C
*
Clean signal
*Filtering performance advances with addition of capacitor
2
Bourns? Surface Mount Power Inductor and Common Mode Chokes Selection Guide ~ 2010
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