铁基非晶磁环的高频响应和ns级脉冲响应特性
High-frequency response and ns-range pulse response of iron-based amorphous cores
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摘要: 为了获取高频和快脉冲条件下铁基非晶磁芯的重要特性参数，对三种国产铁基非晶磁环的高频响应和快脉冲响应特性进行了实验研究。通过1∶1变压器测试回路发现，在1~20 MHz等振幅正弦源信号作用下，磁芯响应信号幅度损失率从0陡增至50%~60%，当源信号频率继续增大时，响应信号幅度损失率维持在50%~60%。对磁芯快前沿脉冲响应特性进行频谱分析和实验研究的结果表明：受高频涡流损耗影响，磁芯对脉宽小于30 ns时的方波信号的幅度和平顶响应较差；源信号脉宽大于100 ns时，响应信号基本可与源信号重合，且最短前沿响应时间为10 ns。给出了20 Hz~1 MHz周期信号作用下，磁芯相对磁导率随频率的变化曲线。最后给出了在ns级快前沿脉冲作用下，磁芯脉冲磁导率的估算方法和测量结果。Abstract: In order to get important characteristic parameters of three kinds of domestic amorphous cores under the conditions of high frequency and fast pulses, frequency response and fast-pulse response of these cores are analyzed in detail in this paper. In the test circuit of a 1∶1 transformer, attenuation ratio of the response voltage increased from 0 to 50%~60% when the frequency of the sinusoidal source voltage increased from 1 MHz to 20 MHz. According to theoretical analysis, high-frequency eddy loss caused this voltage attenuation. Fast-pulse response of amorphous cores were also studied, and experimental results showed that these cores responded inferiorly to the amplitude and flat top of the square pulse when the pulse width was less than 30 ns. However, response signal and source signal
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