Patent ID: 8723508

Claim:
A method for analyzing the DC superposition characteristics of an inductance device using an electromagnetic field simulator, comprising a first step of determining an initial magnetization curve from initial magnetization to saturation magnetization, and pluralities of minor loops at different operating points on said initial magnetization curve, on a toroidal core made of the same magnetic material as that of said inductance device, and using each operating point and incremental permeability defined as the gradient of each minor loop at each operating point, to obtain point-list data showing the relation between magnetic flux density or magnetic field strength and said incremental permeability; a second step of determining an operating point at a predetermined direct current on each element obtained by mesh-dividing an analysis model of said inductance device by an electromagnetic field simulator based on the initial magnetization curve of said toroidal core, allocating the incremental permeability to said operating point from said point-list data, and integrating the inductance of each element obtained from said incremental permeability to determine the inductance of the entire inductance device; and a third step of repeating the second step at different direct current levels to determine said DC superposition characteristics.