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Core losses for DC biased ferrites

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ahmedsalah00

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Hello all,
I am trying to calculate the ferrite core losses resulting from the an alternating current biased by a certain DC value. the core is ETD29 and the material is Epcos N27. What is the value of flux density B that can be used in the Manufacturer Pv curves? Bmav , Bav or ∆B ? the attached picture illustrates the change of B over time.
 

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