The magnetic field distribution of the molded inductor(typical sizes of 6.6 mm×6.6 mm×3 mm)was firstly simulated using electromagnetic simulation software.Then the equivalent magnetic circuit model of the inductor was proposed and how the coil structure affects the inductance and DC superposition characteristics of molded inductor were analyzed in detail.When the coil diameter D increases from 2.0 mm to 5.2 mm while keeping the number of coil turns at 8.5,the total magnetic resistance inside the inductor first decreases and then increases,while the inductance value increases and then decreases.When D =4.8 mm,the total magnetic resistance and inductance reaches the minimum and maximum values,respectively.When using the same magnetic core material,the inductors with coil structure of N=10.5,D =3 mm(N10D3)and N=8.5,D =4 mm(N8D4)have similar initial inductance values,but the internal magnetic field distribution of the N8D4 inductor is more uniform than that of the N10D3 inductor,i.e.,exhibiting better DC superposition performance.
molded inductorsequivalent magnetic circuitmagnetic resistancemagnetic field intensityDC superimposition
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维普
