一种电阻脉冲分压器的研制

Design of Resistive Divider for Measuring HV Pulse

陡前沿高压脉冲测量对分压器的响应性能提出了非常苛刻的要求。电阻分压器对地分布电容是影响其性能的关键因素。采取在高压臂的低压端加入套筒电极的补偿措施,部分地收集原本由高压臂电阻体流向地的杂散电容电流,并调节各相关参数的匹配以减小分压器高压臂对地分布电容的影响,研制出了一种新型的电阻分压器。PSpice性能仿真分析表明:该设计可以减少响应时间和上升时间3 ns以上,改变电极的长度即可在一定的范围内调节其响应性能;适当的电感将有助于降低上升时间。仿真分析还证实了阶跃响应上升时间能够实现<1 ns。对准阶跃波、静电放电枪校准波及纳秒双指数脉冲的实验测量表明该分压器性能优越。

The response time and rise time of a divider must be short enough for measuring the exp-pulse of high voltage and fast rise. Distribution capacitance between ground and resistance of a divider is the key factor that influences its performance. A new counterbalance way is researched, and the structure of new resistive divider is designed in this paper. A sleeve electrode pole is joined to its low voltage end of high voltage arm for reducing the effect of that distribution capacitance and adjusting the match of correlative distribution capacitances. The performance of new divider is simulated based on Pspice. The result of simulation presents that its response time and rise time are both reduced more than 3 nanoseconds. And its performance can be adjustable easily by changing the length of sleeve electrode pole. But its step response will overshoot when the pole is too long. In the meantime, simulation analysis indicates that proper value of inductance can help to reduce rise time on step response, and reducing its distribution capacitance of parts is important to improve its performance. It is also approved by emulation that rise time less than one nanosecond is able to be achieved. Measurement experiment of step wave, ESD wave and nanosecond double exponential wave are done also in this paper. Its result approves that this counterbalance technique is effective and predominant. The new divider is satisfactory to the measurement requisition, and has a favorable foreground of applicatiob.