新型航空瞬变电磁法脉冲电流发射电路研究

来源期刊:中南大学学报(自然科学版)2017年第9期

论文作者:于生宝 姜健 孙长玉 陈旭

文章页码:2388 - 2396

关键词:航空瞬变电磁法;脉冲电流;降压式零电流开关脉宽调制

Key words:airborne transient electromagnetic method; pulse current; buck ZCS-PWM

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 novel pulse current emission circuit for airborne transient electromagnetic method was proposed. Buck circuit and H bridge circuit were combined together. The H bridge circuit was used as the load of Buck circuit; the H bridge circuit was used to control the direction of the emission current; Buck ZCS-PWM circuit was used to control the voltage of emission coil at both ends and promote the work frequency of the emission circuit. The problem that the noise, ripple and switching loss of the pulse current rising edge and flat top of the traditional transient electromagnetic method was solved. Energy-feedback and constant voltage clamp circuit was adopted to improve clamping voltage and control the falling edge of the pulse current. The blocking diode in H bridge circuit was used to eliminate the overshoot current. The effect of Buck ZCS-PWM controlling technology on the quality of waveform and the relationship between clamp voltage and turn-off time of falling edge were discussed. The specific design scheme and circuit parameter were given. The method of simulation and experiment was used to contrast and analyze with the current waveforms of the traditional emission circuit. The results show that there are many advantages about the current waveform of the novel airborne transient electromagnetic method. The noise, ripple and switching loss of the pulse current rising edge and flat top is small, and the time of falling edge is short. Linearity is high, and there is no overshoot current.

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