![]() The roll-off referred to the lower tolerance limit of the inductance minus a safety margin is then assigned to this current. ![]() 20%, from the material saturation figure as judged by empirical data. ![]() ![]() It is then verified if the resulting value is distant enough, e.g. Note that the validity of Equation 1 improves with increasing air gaps. N stands for the number of turns, I for the current, l e for the effective magnetic length of the core and g for the air gap. 1.Ī target roll-off in the range of 10% to 30% is linked to a dc flux density as estimated from the dc current and the gapping factor β, defined by the reciprocal difference between the effective and the initial permeabilities: (Eq. The conventional way to formulate a dc-bias specification for a gapped core based on measurements shown in Fig. This is because incrementing key material properties requires advancement in both material composition and processing in order to push the limits. The importance of attaining a precise definition of target values is driven by the need of miniaturization, on one hand, and the slow progress of material performance, on the other. ![]() The widespread use of gapped ferrite cores for inductive components subject to a superposed dc current poses a challenge to the way the required properties are specified. ![]()
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