一种改善瞬变电磁发射电流波形的系统设计

发布时间：2018-06-24 12:39

本文选题：瞬变电磁 + 电流波形　；参考：《电测与仪表》2017年03期

【摘要】：为了减小瞬变电磁发射机发射电流的关断时间,保证发射电流关断沿的线性度,抑制关断后电流过冲,简化钳位电压电路,设计了一种简便的瞬变电磁发射系统。提出了一种利用TVS管和电容相结合的恒压钳位电路并采用传统的在负载两端并联匹配电阻的吸收方式。通过调节TVS管的稳压值,可以调节关断时间和关断沿斜率;选择直接在负载两端匹配合适电阻,保证了关断前期处于欠阻尼状态,关断后期处于临界阻尼状态,在快速关断的前提下,有效防止关断后电流过冲,达到了改善发射电流波形的目的。实验结果表明,该系统电路结构简单、稳定、易于实现,在短关断延时、关断沿线性化和关断后无过冲方面,得到明显改善。
[Abstract]:In order to reduce the turn-off time of transient electromagnetic transmitter, ensure the linearity of the turn-off edge of the transient electromagnetic transmitter, restrain the current overshoot after switching off and simplify the clamp voltage circuit, a simple transient electromagnetic emission system is designed. This paper presents a constant voltage clamp circuit which combines TVs and capacitors and adopts the traditional absorption mode of matching resistor at both ends of the load in parallel. By adjusting the steady voltage value of TVs tube, the turn-off time and the slope along the turn-off can be adjusted, and the suitable resistor is matched directly at the two ends of the load, which ensures the underdamped state in the early stage of turn-off and the critical damping state in the latter stage of turn-off. On the premise of fast turn-off, the overshoot of current after turn-off is effectively prevented and the transmitting current waveform is improved. The experimental results show that the circuit structure of the system is simple, stable and easy to realize. The system has been improved obviously in the aspects of short turn-off delay, linearization of turn-off edge and no overshoot after turn-off.
【作者单位】：吉林大学仪器科学与电气工程学院地球信息探测仪器教育部重点实验室;
【基金】：国家重大科学仪器设备开发专项(2011YQ030133)
【分类号】：P631.325

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