Loss characteristics of a magnetic core for pulsed power applications
Loss characteristics of a magnetic core for pulsed power applications
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DOI：
10.1109/tps.2007.907905
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发表时间：
2007-12-01
影响因子：
1.5
通讯作者：
Akiyama, Hidenori
中科院分区：
文献类型：
--
作者：
Choi, Jaegu;Namihira, Takao;Akiyama, Hidenori
为了研究磁芯在快脉冲磁化下的损耗特性，制作了一个低电感电路。从实测的电压和电流波形中导出了B-H曲线，并使用一种新的方法来确定饱和时间，从而导出了磁芯的损耗。导出的B-H曲线显示出以下特性：高的非饱和磁导率与饱和磁导率之比（mu（un）/mu（sat））、约2.5T的最大磁通摆动、高的剩余磁通密度与饱和磁通密度之比（B-r/B-s）和低的铁损。此外，对于固定电容，磁芯损耗随着充电能量的增加而增加，这意味着磁芯损耗与饱和时间成反比，而百分比磁芯损耗随着充电能量的增加而减小。磁滞损耗与频率成正比，对于所用磁芯，涡流损耗可以忽略不计。芯饱和期间的耗散能量对于每个频率始终是充电能量的3.0%，这表明芯饱和并且表现为空气芯。
A low-inductance circuit has been fabricated in order to investigate loss characteristics of the magnetic cores under fast pulse magnetization. The B-H curves have been derived from the measured voltage and current waveforms, and the losses of the magnetic cores have been derived using a novel method to determine time to saturation. The derived B-H curves show the following characteristics: a high ratio of unsaturated to saturated permeability (mu(un)/mu(sat)), a maximum flux swing of about 2.5 T, a high ratio of remanent flux density to saturation magnetic flux density (B-r/B-s), and a low core loss. Furthermore, the core loss increases as the charging energy increases for a fixed capacitance, which means that the core loss is inversely proportional to the time to saturation, whereas the percentile core loss decreases as the charging energy increases. The hysteresis loss is proportional to frequency, and the eddy current loss can be neglected for the used core. The dissipated energy during core saturation is consistently 3.0% of the charging energy for each frequency, which indicates that the core is saturated and behaves as an air core.