磁开关磁芯动态参数测试及分析

Dynamic parameter test and analysis of magnetic switch core

磁开关是磁脉冲压缩系统的关键部分,磁开关的磁芯性能参数直接影响到磁脉冲压缩系统的总体性能。针对磁脉冲压缩系统中磁开关磁芯应用特性,设计了回路振荡法对磁芯动态磁特性进行测量。通过测量磁开关工作电压和电流参数,计算磁芯的动态磁滞回线,确定饱和磁感应强度、矫顽力等动态参数。基于实验测量参数建立了包含动态磁滞回线的磁脉冲压缩电路模型,研究了磁开关动态特性对电压传递的影响。根据研究结果可得,在磁脉冲压缩系统设计中选择矫顽力较小的磁芯,可降低磁开关的能量损耗,从而保证系统具有较高的电压传递效率。

Magnetic switch is the key part of magnetic pulse compression system. The performance parameters of magnetic switch core directly affect the overall performance of the magnetic pulse compression system. According to the physical properties and application features of the ferrite core, a loop oscillation circuit is designed to test the dynamic characteristics of the magnetic cores under fast pulse excitations, and the hysteresis loops of the ferrite cores under hundreds of nanoseconds excitations are obtained. The diagnosis of the winding current and the change rate of magnetic flux on the magnetic core provides necessary value for determining the hysteresis loop, saturated magnetic flux intensity and coercivity of magnetic core. A magnetic pulse compression circuit model with dynamic hysteresis loop is established based on the experimental measurement parameters, and the effect of the dynamic characteristics of the magnetic switch on the voltage transfer is studied.