变压器中初次级线圈对电容分压信号的影响

在小型脉冲变压器中,常采用分布式电容分压器实现输出电压的实时监测,但实际的测量波形存在畸变,为此根据变压器电容分压等效电路模型,结合ANSYS软件进行有限元仿真计算,分析了脉冲高电压变压器中分布式电容分压器输出信号的主要贡献源及影响程度;用频率响应法测量计算电容分压输出信号的结果表明:分压输出信号中,感应至初级线圈的信号约占24%,初级线圈对电容分压信号的影响较大,是一个重要的干扰源。针对以上结果,利用ANSYS软件进行结构优化,提出了降低初级线圈影响的方法。

Influence of Primary and Secondary Transformer Windings on Capacitive Voltage Divider

In order to explain reasons of abnormal output of mini pulse transformer and to analyze the main signal sources and influential factors of capacitive voltage divider when it works,according to the equivalent circuit model of capacitive divider,the simulation was performed by the ANSYS software.The results show that the primary and secondary windings of transformer are the main signal sources of capacitive voltage divider,and primary winding has some influences on the output signal.The signal induced from the primary winding is about 24% of output.Then frequency response method is used to measure the transformer and to confirm the distortion reasons of the output signals of the capacitive divider when transformer practically works.For improving the output of capacitive voltage divider,the configuration was optimized by the ANSYS software,moreover,it is pointed out that reducing the capacitance between the primary winding and capacitive divider can lower the influence of primary winding.