Abstract
A practical method is presented: how to adjust the inductance curve of a nonlinear (saturable) inductor with respect to a desired shape. For this purpose, a nonlinear model was developed based on finite element method (FEM). It is shown how a highly efficient construction with low stray fields and maximum package density can be achieved. Different prototype inductors were realized to illustrate the practical capability of photovoltaic (PV) inverters as well as active power factor correction (PFC) applications. All simulations are verified by means of experimental data drawn from electrical measurements.
Highlights
A nonlinear shape of inductance is generally preferred if the peak inductor current is much higher than its effective current. This is typical for active power factor correction (PFC) systems [1]
To be able to predict the inductance curve L(I) of arbitrary core- and winding configurations [5,6,7], the static material curves shown in Figures 4 and 5 were implemented into a numerical field solver based on finite element method (FEM)
It is found that block yokes of Sendust (CoolMμ) metal powder with a relative permeability μi /μ0 = 125 are optimum
Summary
A nonlinear shape of inductance is generally preferred if the peak inductor current is much higher than its effective current (high crest factor). This is typical for active power factor correction (PFC) systems [1]. Due to magnetostriction close to zero (low noise) and moderate core losses at higher frequencies, the chokes are applicable for PV inverters as well as active PFC. Using the design methodology described later, a desired shape of the L(I) curve can be obtained with low stray fields, minimum losses, and a maximum level of package density
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