Dynamic Characteristics of Magnetic Core Under Micro-second Pulse Excitation

A one-stage magnetic pulse compression(MPC) system without external remagnetization circuits was designed and manufactured so as to test the dynamic characteristics of magnetic core under micro-second pulse excitation.Three pieces of magnetic core samples represent Fe-based noncrystal,Ni-Zn and Mn-Zn soft magnetic materials respectively.B-H curves of the magnetic cores were derived from the measured voltage and current waveforms.Variation characteristics of the three materials under micro-second pulse excitation can be figured out from the B-H curves.Through detailed analysis and comparison,it can be concluded that Fe-based noncrystal magnetic core has the largest jump of magnetic flow,so that the volume of magnetic core needed is minimal with the same volt-second product and the same number of windings;however,Mn-Zn ferrite magnetic core bears the minimal energy loss,which makes it suitable for applications under high repetitive frequency;Ni-Zn ferrite magnetic core,which owns the lowest relative permeability while saturation,is seemly in MPC circuits with relative high compression gain.