Abstract
The electromagnetic behavior of the inductors used as passive circuit elements directly affects the electrical and mechanical performance of the power electronics circuits. In general, when using inductor core structures with or without airgap in the classical design process, the dynamic effects of the inductance value are not considered in the design stage. However, the inductance value may change during the operation of the circuit due to electrical and magnetic parameters of the inductor, and this change is called roll-off value of the inductance. In this study, the roll-off value has been measured graphically and numerically based on mechanical parameters (such as air-gap length) and electrical parameters (such as winding turns and DC current amplitude) for an air-gapped ferrite E core designed with FEA software. Thus, not only the inductance value calculated in the design stage but also the roll-off value during the operation of the circuit has been reported with the parametric simulation studies.
Highlights
NOWADAYS, advanced power electronics application area is growing with the tendency to use renewable energy sources and they are frequently used in daily life with current applications such as electric vehicles [1]
Roll-off value of the ferrite core inductor has been determined with the parametric finite element analysis (FEA) software based on mechanical and electrical parameters for air-gapped E core designed for a DC-DC boost converter circuit
In order to determine the dynamic inductance value according to this table, a number of specific parameters such as DC-DC boost converter switching frequency and inductor current ripple, which are designed for a certain power value, were utilized
Summary
For the effects of the air-gap parts on the dynamic inductance and roll-off values of the inductor, electromagnetic modeling facilitates the design process [7]. Roll-off value of the ferrite core inductor has been determined with the parametric FEA software based on mechanical and electrical parameters for air-gapped E core designed for a DC-DC boost converter circuit. The magnetomotor force can be modeled as an electrical circuit with the Amper-Winding (NI) value of the inductor and the reluctance values in the air-gapped inductor core (Fig. 1). For the inductance value and saturation flux value in air-gapped inductor design, Eq(9) and Eq(10) can be given [19] In this situation, the current value which can cause saturation of the air-gapped inductor core can be determined by Eq (11) [11]. The required air gap length Eq(13) may be calculated in the inductor designed with air gap for a given core cross sectional area (Ac) and the desired inductance value (L) [7]
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