应用于PFN-Marx发生器重频充电的紧凑空心脉冲变压器

Theoretical research of compact air-core pulse transformer for PFN-Marx generator repetitive charging

通过理论分析研究了一种高能量转换效率(高于50%)的紧凑重频空心脉冲变压器。这种脉冲变压器可以应用于PFN-Marx发生器的重频充电。通过深入分析脉冲变压器的等效模型,得到了脉冲变压器能量转换效率、次级电压峰值、初级电流峰值以及初级电流变化率最大值的表达式,并与Pspice软件的模拟结果进行比较。结果表明:理论计算的电压、电流波形与模拟计算结果基本一致,验证了理论分析的正确性。同时,通过理论分析得到了能量效率大于50%的脉冲变压器结构尺寸。

A compact air core pulse transformer with an energy conversion efficiency of 50% was theoretically investigated. The transformer was employed to repetitively charge a small sized solid state Marx modulator. A pulse forming network （PFN） was added to each stage of the Marx to lengthen the pulse width to several ten ns. By an in depth analysis of the equivalent circuit of pulse transformer, the expressions for calculating the energy conversion efficiency, the peak of the secondary voltage, the peak and steepness of the primary current of the transformer were deduced in this paper. The calculation results were compared with the simulation ones by Pspice software. The analysis results indicate that the theoretical calculation of the primary voltage and current waveform were in accordance with the results of the simulative calculations. Therefore, the correctness of the theory in this paper was verified. Meanwhile, the structural parameters of the transformer with an energy conversion efficiency of 50% were obtained by theoretical calculation. The parameters will provide a theoretical guidance for the design and fabrication of the pulse transformer.