有源恒压钳位瞬变电磁发射机技术  

Active constant voltage clamping technology for transient electromagnetic transmitter

作　　者：刘丽华[1] 吴凯[1] 耿智[1] 赵海涛[1,2] 方广有[1] 

机构地区：[1]中国科学院电子学研究所,中国科学院电磁辐射与探测技术重点实验室,北京100190 [2]中国科学院大学,北京100039

出　　处：《地球物理学进展》2016年第1期449-454,共6页Progress in Geophysics

基　　金：<深部资源探测核心装备研发>国家重大科研装备研制项目(ZDYZ2012-1-03)资助

摘　　要：针对瞬变电磁系统发射机对大电流、短关断延时、高线性度的技术要求,论文提出一种新颖的基于BOOST升压原理的有源恒压钳位瞬变电磁发射机电路,详细论述了恒压钳位原理和电路设计方法,重点分析了发射电流下降沿及上升沿恒压钳位动态过程、电路参数计算以及钳位电压恒定原理.研制完成钳位电压500 V,发射电流峰值50 A,发射波形为双极性方波的瞬变电磁发射机,并通过一系列测试实验进行验证.测试结果表明,在大电流发射及感性负载条件下,论文提出的有源恒压钳位方法成功实现了电流下降沿快速、线性关断,从而有效提高了发射电流波形质量及瞬变电磁系统对地下目标的探测能力.A novel active constant voltage clamping transient electromagnetic（ TEM） transmitter basing on the BOOST circuit is presented,according to the transmitting current＇s requirement,such as large amplitude,short turn-off delay time and high linearity of falling edge. The principles of constant voltage clamping technology and practical circuit design are described in details. The dynamic process of constant voltage clamping for current falling edge and rising edge,circuits parameters calculation,and clamping voltage stabilizing are analyzed. A TEM transmitter with 500 V constant clamping voltage,50 A peak current and bipolar square waveform is developed and verified by a series of experiments. The results demonstrated that constant voltage clamping technology realized fast turning off of falling edge and better linearity under large current and strong load inductance. Therefore, this transmitter could effectively enhance the quantity of the current waveform and target detection capability for the TEM system.

关 键 词：有源恒压钳位 关断延时 双极性方波 高速关断 线性度 瞬变电磁发射机 

分 类 号：P631[天文地球—地质矿产勘探]