Accurate characterization of the nonlinear magnetization characteristics of the magnetic core is crucial for numerical simulation of the induction voltage adder (IVA). The IVA’s excitation pulse has a rise time of tens of nanoseconds

thus the core’s magnetization characteristics under fast-pulse conditions are difficult to measure directly through experimental methods. In this paper

a prediction method for inverse J-A parameters of amorphous sandwiched core is proposed

the hysteresis loops of the core under different pulse frequencies are tested by the double-winding method;meanwhile

the saturation magnetic flux density

remanent magnetic induction

coercivity

differential permeability at coercive force point and saturation magnetic field strength are taken as the key characteristic parameters of the hysteresis loops

the experiment controls the peak excitation current to ensure the saturation point of the core remains unchanged

and the relationships between remanent magnetic induction

coercivity

differential permeability at coercive force point and excitation pulse equivalent frequency are obtained by numerical fitting. Finally

the characteristic parameters under high frequency are used to plot the hysteresis loops

followed by inverse J-A parameter identification. The volumetric core loss is characterized by the hysteresis loop area

and experimental tests are conducted on two sets of hysteresis loops above 1 MHz frequency. The results show that the error in core energy loss between the predicted and measured hysteresis loops is less than 3%

validating the effectiveness of this method. The inverse J-A parameter identified under fast-pulse excitation can be applied to the nonlinear modeling of IVA core.