If a power inductor as part of line filter reaches saturation current and goes into saturation will it come back to normal after the load current reduces to nominal level? In otherwards, is core saturation reversible process?
-sridhar
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into saturation will it come back to normal after the load current reduces to nominal level? In otherwards, is core saturation reversible process?
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** AC line filters are normally made such that saturation of the ferrite is not possible.
Cos there are two windings carrying current in opposite directions.
** Yep.The core may have some temporary magnetisation, but that soon vanishes with use.
... Phil
yes, unless the overcurrent was exterme enough to damage it permanently (eg: burn the insulation off the windings)
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into saturation will it come back to normal after the load current reduces to nominal level? In otherwards, is core saturation reversible process?
It is for DC use as part of LC filter to minimize the surges particularly from inductive load switching. Does inductive surge for such a brief period of few milli seconds cause the core saturation?
** Core saturation is virtually instant.
It depends on the current level flowing in the winding, independent of the frequency.
.... Phil
goes into saturation will it come back to normal after the load current reduces to nominal level? In otherwards, is core saturation reversible process?
inductive load switching. Does inductive surge for such a brief period of few milli seconds cause the core saturation?
it could... you have the figures, run the arithmetic.
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Note: some ferrites are not reversible. Ni-Zn ferrites usually warn to avoid saturation, else permeability will drop somewhat.
I swear I've had one toroid (strip steel core) which stayed magnetized after being saturated for a while (too much DC bias). Running it at AC (no DC bias, AC well below saturation), it still ran hot and noisy (banging its head against saturation).
Magnets are weird.
Tim
-- Deep Friar: a very philosophical monk. Website:
Back in the day, seems like I remember a vendor trying to sell me some magnetically biased "DC inductors". Claimed twice the amp-turns for the same size core.
It's not rocket science:
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
into saturation will it come back to normal after the load current reduces to nominal level? In otherwards, is core saturation reversible process?
In a word, YES.
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