恒流源驱动感性负载电路优化设计与试验研究

第39卷第11期2018年11月自 动 化 仪 表PROCESS AUTOMATION INSTRUMENTATION Vol.39No.11Nov.2018

收稿日期:2018-05-15作者简介:朱友峰(1993 ),男,在读硕士研究生,主要从事智能化测控仪器及自动化装置方向的研究,E-mail:zyf9281@https://www.sodocs.net/doc/8012660893.html,;

曹玉强(通信作者),男,硕士,教授,主要从事检测技术及应用方向的研究,E-mail:caoyuqiang@https://www.sodocs.net/doc/8012660893.html,

恒流源驱动感性负载电路优化设计与试验研究

朱友峰,曹玉强,姜明顺,丁昌鑫,张晓麒

(山东大学控制科学与工程学院,山东济南250061)

摘 要:激发极化法是目前在金属探矿二地质普查等地质勘探工作中广泛采用的探测方法三探测的首要工作是保证激励源的供电性能三直流恒流源在多点供电输出时,以其恒流特性成为首选三直流恒流源在驱动阻性和容性负载时,供电电流能精确上升到设定值;但是驱动感性负载时,实际电流值低于设定电流值三测量供电回路中各点的电压并分析,发现电路中出现了交流分量三通过在反馈回路增设补偿电容改善了恒流源性能,解决了由于引入感性负载导致供电电流偏小的问题三试验结果表明,经过优化设计的恒流源供电电流能够达到设定值,满足地质勘探中对供电电流的要求,减小了采集误差三

关键词:探测;直流恒流源;感性负载;电容补偿;集成运放;恒流法;负反馈;交流干扰

中图分类号:TH702;TP272 文献标志码:A DOI:10.16086/https://www.sodocs.net/doc/8012660893.html,ki.issn1000-0380.2018050017

Optimization Design and Experimental Research of Inductive Load Circuit Driven by Constant Current Source

ZHU Youfeng,CAO Yuqiang,JIANG Mingshun,DING Changxin,ZHANG Xiaoqi (College of Control Science and Engineering,Shandong University,Jinan 250061,China)

Abstract :Currently,induced polarization method is a widely used detection method in geological exploration work such as metal prospecting and geological survey.Ensuring the power supply performance of the excitation source is the primary task of detection.DC constant current source is the first choice with its constant current characteristics at multipoint power supply output.When the DC constant current source drives resistive and capacitive loads,the supply current can rise accurately to the set value;but when it drives the inductive loads,the actual current value is lower than the set current value.The voltage of each point in the power supply circuit is measured and analyzed;the AC component is found in the circuit.By adding compensation capacitor in the feedback loop,the performance of the constant current source is improved,and the problem that the power supply current is reduced due to the introduction of inductive load is solved.The test results show that the power supply current of the constant current source can reach the set value after the optimized design,which meets the requirement of the supply current in the geological exploration and reduces the acquisition error.

Keywords :Detection;Constant current source;Inductive load;Capacitor compensation;Integrated operational amplifier;Constant current method;Negative feedback;AC interference 0 引言

随着电法勘探在地质探测工作中的大量应用,探

测中对直流恒流源的需求越来越多[1-2]三在地质探测中,直流恒流源一般都在大电流状态下工作,在工作时

需要非常稳定的输出,才能保证检测结果的准确三一

旦出现供电电流波动,采集结果将会引入误差,后续的

分析工作将不准确[3]三为了保证直流恒流源的稳定输出,必须确保恒流源的性能稳定二受负载影响小二电路

输出不随负载的变化而波动三目前,在实际应用的电法勘探中,直流恒流源在给阻性负载供电时能满足需求,但是在供电输出点较远的情况下,加入较长的电缆后,实际电流达不到设定值[4]三针对以上问题,对电路的工作原理进行详细的测试与分析,发现加入电感后电路中出现了交流成分三本文对交流成分产生的原因进行研究,并提出一种电感负载补偿电路,使直流恒流源在驱动感性负载时也能达到电流输出要求,有效提升了直流恒流源的性能三

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