With the development of miniaturization of portable electronic products,the power module is also devel-oping towards miniaturization,so it is particularly important to model and design the largest magnetic component in-ductor in the power module.For the thin-film inductors in chip inductors,the magnetic circuit model is established and the inductance is calculated by using the magnetic field division method.Then,the magnetic field of each reluc-tance was further analyzed,and the simple magnetic field expression is derived.The DC superposition characteristics of inductors are studied by substituting the permeability curve fitted by polynomial;The relationship between the number of turns and the resistance is analyzed when a target inductance value is designed,and it is concluded that the ratio of the magnetic core height under the optimal number of turns is about 59％;Finally,the accuracy and practicability of the model are verified by the finite element simulation software.When the core height ratio is 54.74％～63.16％,the error range is-1.97％～0.31％,and when the core height ratio is about 59％,the satura-tion current error is less than 4.28％.
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