高电压闭合磁环小型脉冲变压器

Compact high-voltage pulse transformer with closed magnetic core

研制了一种结构紧凑、电压升压倍数高达109倍的200 kV级脉冲变压器,以实现高压脉冲变压器的小型紧凑化。用电磁理论分析、电路模拟及实验测试3种方法对变压器的耦合、耐压和输出特性进行了研究,对重要参数进行了计算和设计。采用晶粒取向硅钢薄带作为变压器磁芯,且磁芯闭合,变压器的有效耦合系数高达0.95以上。高分子材料的绝缘套筒结构和分层交替的绕线方式,使得变压器在初级低压充电2.1kV时,次级可输出幅度为230 kV、半高全宽为3μs的高电压脉冲。模拟和实验结果验证了理论设计的合理性。

A compact 200 kV pulse transformer with step-up ratio of 109 was developed to miniaturize high-voltage pulse transformer. Researches on coupling, high-voltage insulation and output characteristics of the transformer were carried out by electromagnetic theory, circuit simulation and experiments. Important parameters were calculated and designed. As the closed magnetic core of the transformer was made of crystal-tropism silicon-steel strip, the effective coupling coefficient reached as high as 0.95. With insulated structure of polymeric cylinder and alternate-winding method, the secondary windings of transformer could deliver a high-voltage pulse of 230 kV and full width at half maximum (FWHM) of 3 μs when initial voltage of the primary energy-storage capacitor was 2.1 kV. Results of simulation and experiments has proved the theoretical design.