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.

Differential-output current loops(B-dot probes) were designed and calibrated to derive inner-MITL current in the PTS facility.The B-dots’ upper limiting frequency was 51.7 MHz in frequency response experiments,which was satisfactory for current measurement in our experiments.The B-dots were calibrated using a radial transmission line that was driven by an azimuthally symmetric current pulse.And then the B-dots were calibrated using a radial transmission line with a post-hole convolute feeding structure.The result indicates that the sensitivity of B-dots are consistent in the two calibration systems.The interference test and experiments with variable peak currents were performed to focus on B-dot linearity,and insulation,pressure exerted by magnetic fields,energy absorbing and related temperature rise of B-dot were analyzed in order to assess the validity of B-dot calibration.The results imply that the B-dots are valid for several mega-ampere current measurements.Also,it shows that outer-MITL current and inner-MITL current are self-consistent in PTS experiment.