Finite Element Analysis of Inductor Core Loss under DC Bias Condition
The finite element method is a popular way to analyze the magnetic core loss in complex core structures. However, accurate calculation of the inductor core loss under DC bias conditions is still a challenge, because magnetic properties like permeability and core loss density change when a DC pre-magnetization is present; especially for a saturable core. This paper proposes a method which can accurately calculate the inductor loss under DC bias current conditions. The method utilizes the material model built by curve-fitting the measurement data, and the model is effective and simple. To verify this approach, planar inductors with low-temperature co-fired ceramic (LTCC) ferrite are simulated, and the calculated core losses are experimentally verified.