关于降低恒流段纹波的瞬变电磁发射电路研究*

doi:10.11985/2023.04.017

摘要/Abstract

摘要：

瞬变电磁发射系统对发射电流的波形有着较高的要求，发射波形越接近理想的方波，探测效果就越好，但实际情况下，发射波形难以达到理想方波，一般采用梯形波替代，而且发射恒流段的波形实际呈e指数上升而非近似水平的。针对上述问题，提出一种改进的发射电路，即通过两个场效应管(Metal oxide semiconductor field effect transistor, MOSFET)控制电阻线路的关断，并加入脉冲宽度调试(Pulse width modulation, PWM)控制，使发射恒流段斜率近似为0，而加入的两个可控电阻使发射电路的等效阻值更加灵活从而降低PWM斩波后纹波的幅值，使发射电流的恒流段更加平稳，从而降低对接收信号的影响。为缩短发射电流的关断时间通常加入恒压钳位控制电路加以控制，使探测效果更好。

关键词: 瞬变电磁法, 发射波形, PWM斩波, 恒压钳位

Abstract:

Transient electromagnetic emission systems have higher requirements on the waveform of the emission current. The closer the emission waveform is to the ideal square wave, the better the detection effect. However, in actual situations, the emission waveform is difficult to achieve the ideal square wave. Generally, trapezoidal waves are used instead. The waveform of the constant current section of the emission actually rises exponentially rather than the approximate level. Regarding the issue above, an improved transmitter circuit is proposed, that is, two metal oxide semiconductor field effect transistor(MOSFETs) are used to control the turn-off of the resistance circuit, and pulse width modulation(PWM) control is added to make the slope of the transmitter constant current section approximately zero, and the addition of two controllable resistors makes the equivalent resistance of the transmitting circuit more flexible, thus reducing the amplitude of ripple after PWM chopping, making the constant current section of the transmitting current more stable, thereby reducing the impact on the received signal. In order to shorten the turn-off time of the emission current, a constant voltage clamp control circuit is usually added to control, so that the detection effect is better.

Key words: Transient electromagnetic method, emission waveform, PWM chopping, constant voltage clamp

中图分类号:

TM133

巫庆辉, 顾鑫, 唐康, 侯利民. 关于降低恒流段纹波的瞬变电磁发射电路研究^*[J]. 电气工程学报, 2023, 18(4): 152-160.

WU Qinghui, GU Xin, TANG Kang, HOU Limin. Research on Transient Electromagnetic Transmission Circuit for Reducing Ripple in Constant Current Section[J]. Journal of Electrical Engineering, 2023, 18(4): 152-160.

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