Ni-Zn铁氧体的动态磁特性  

Dynamic magnetic characteristic of Ni-Zn ferrite magnetic cores

作　　者：张东东[1,2] 严萍[1] 王珏[1] 周媛[1,2,3] 邵涛[1] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院研究生院,北京100049 [3]天津工程师范学院,天津300222

出　　处：《强激光与粒子束》2010年第4期739-742,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(50907068;50707032);中国科学院知识创新工程重要方向项目(KGCX2-YW-339)

摘　　要：设计并制作了基于没有附加磁芯复位电路的单级、双级磁脉冲压缩系统电路,用于测试Ni-Zn铁氧体磁芯在μs及亚μs级脉冲激励下的动态磁特性。磁芯的磁滞回线由测量到的磁开关两端电压和电流数据经计算得到,由磁滞回线可知磁芯在μs及亚μs级脉冲激励下的各种特性参数如饱和磁感应强度、剩余磁感应强度、矩形比、磁通密度跳变、矫顽力、饱和磁场强度及单位体积材料磁滞损耗;通过比较两块磁芯在μs及亚μs级脉冲激励下的各种动态磁特性参数可知:两块磁芯随激励脉冲宽度变窄磁芯磁性能有不同程度的下降,亚μs级脉冲激励下的矫顽力和单位体积材料磁滞损耗都比μs级脉冲激励下增大约3倍;饱和磁感应强度小、剩余磁感应强度大的Ni-Zn铁氧体磁芯动态磁特性性能优异,适合用于更窄脉冲的压缩电路中。A test circuit was designed and built,which is based on one-stage and two-stage magnetic pulse compression systems without external demagnetization circuits,so as to test the dynamic magnetic characteristic of Ni-Zn ferrite magnetic core under excitation pulses of microsecond and sub-microsecond level.The hysteresis loop of the magnetic core was calculated by tested voltage and current from the magnetic switch,with which various characteristic parameters of the magnetic core under the two kinds of excitation pulses can be easily gained,including saturated magnetic induction intensity,residual magnetic flux density,square ratio,magnetic flux density variation,coercive force,saturated magnetic-field intensity and magnetic hysteresis loss of unit material volume.The comparison of the dynamic magnetic characteristic of two cores,each of which was excited by pulses of microsecond and sub-microsecond level respectively,shows that the narrower excitation pulse brings about the dynamic magnetic characteristic decline for both cores,but with different degrees.The coercive force and magnetic hysteresis loss of unit material volume under sub-microsecond excitation are about four times those under microsecond excitation.

关 键 词：脉冲功率 磁脉冲压缩 磁开关 软磁材料 磁滞回线 

分 类 号：TL503.5[核科学技术—核技术及应用] TN78[电子电信—电路与系统]