PFC Inductor Design Considering Suppression of the Negative Effects of Fringing Flux

Abstract

In this paper, the main aim of the study was the investigation of the possibilities of power inductor design, reflecting the performance of the component itself, as well as the operational efficiency of the power factor correction (PFC) converter. PFC inductors represent a key component of the converter, while within the design of any magnetic component, several design rules must be considered to provide proper operational performance. Here we discuss skin-effect, while the proximity effect and formation of fringing flux pose a more serious problem in terms of mitigating their negative impact. Therefore, in this study, the space is devoted exclusively to the analysis of the impact of the fringing flux of the PFC inductor and subsequently to the possibilities of its suppression. The resulting optimizations are reflected in the investigation of the operational efficiency of the PFC converter.

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“…The air-gap permeances were calculated using a standard method presented in [33]. Moreover, when the magnetic flux passes through the air gap between E and I cores, it causes a fringing effect [34]. The permeance equations can be stated as P 12 = P 13 = P of + P if + P bf + P f f + P gf (9) P 11 = 2P if + P bf + P f f + P gf (10) and,…”

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“…However, as the gap increases, the magnetic flux lines begin to bulge, causing the effective reluctance of the air gap to decrease and the inductance to increase in a non-linear relationship, a phenomenon known as the fringe effect. For more details on the fringe effect, the interested reader may refer to [33,35].…”

“…However, as the gap increases, the magnetic flux lines start to bulge out around the gap, causing a reduction in effective air gap reluctance and consequently an increase in inductance, a phenomenon known as the fringing effect, which explains the change in trend of the curve. For more details on fringing effect the interested reader can refer to [33,35].…”