恒流源驱动感性负载电路优化设计与试验研究

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

激发极化法是目前在金属探矿、地质普查等地质勘探工作中广泛采用的探测方法。探测的首要工作是保证激励源的供电性能。直流恒流源在多点供电输出时,以其恒流特性成为首选。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。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。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。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。

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.