新型航空瞬变电磁法脉冲电流发射电路研究

发布时间：2018-04-16 10:13

本文选题：航空瞬变电磁法 + 脉冲电流　；参考：《中南大学学报(自然科学版)》2017年09期

【摘要】：提出一种新型航空瞬变电磁法脉冲电流发射电路,利用Buck电路与H桥电路相结合的方式,将H桥路作为Buck电路的负载,H桥路来控制发射电流的方向,Buck ZCS-PWM(降压式零电流开关脉宽调制)电路控制发射线圈两端电压,提升开关器件工作频率,降低开关损耗,解决传统瞬变电磁法发射电路脉冲电流上升沿与平顶段噪声强、纹波大问题,采用馈能恒压钳位电路提高钳位电压、减小脉冲电流下降沿时间,在H桥路中加入阻断二极管来消除下降沿电流过冲。讨论Buck ZCS-PWM控制技术对脉冲电流上升沿与平顶段波形质量的影响,钳位电压与下降沿时间的关系,给出具体设计方案及电路参数,采用仿真和实验的方法将其与传统发射电路所得电流波形进行对比分析。研究结果表明:新型航空瞬变电磁法脉冲电流发射电路输出电流波形具有上升沿与平顶段噪声与纹波小,开关损耗小,下降沿时间短,线性度高,电流无过冲等优点。
[Abstract]:A new type of aeronautical transient electromagnetic pulse current emission circuit is proposed, which combines Buck circuit with H-bridge circuit.The H-bridge circuit is used as the load of Buck circuit to control the direction of transmitting current. The Buck ZCS-PWM circuit controls the voltage at both ends of the transmitting coil, elevates the switching frequency and reduces the switching loss.In order to solve the problem of strong noise and large ripple of pulse current rising edge and flat-top section in traditional transient electromagnetic transmission circuit, a constant voltage clamp circuit is used to increase clamping voltage and reduce the time of pulse current falling edge.A blocking diode is added to the H-bridge to eliminate the drop-edge current overshoot.This paper discusses the influence of Buck ZCS-PWM control technology on the quality of pulse current rising edge and flat-top wave, the relationship between clamping voltage and drop edge time, and gives the specific design scheme and circuit parameters.The simulation and experiment methods are used to compare the current waveform with the traditional transmission circuit.The results show that the output current waveform of the new aeronautical transient electromagnetic pulse current transmitting circuit has the advantages of small noise and ripple in the rising edge and flat-top section, low switching loss, short descent edge, high linearity and no overshoot.
【作者单位】：吉林大学仪器科学与电气工程学院;
【基金】：国家高技术研究发展计划(863计划)项目(2013AA063904-1)~~
【分类号】：P631.326

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