基于电子负载的恒定微小电流实现及原理分析  

Realization and Principle Analysis of Constant Small Current Based on Electronic Load

作　　者：董莹荷[1] Dong Yinghe(Department of communication and Information Engineering,Shanghai Technical Institute of Electronics&Information,Shanghai,201411,China)

机构地区：[1]上海电子信息职业技术学院通信与信息工程学院,上海201411

出　　处：《现代科学仪器》2021年第3期68-70,共3页Modern Scientific Instruments

摘　　要：恒定的电流一般是从电源获得。市面上比较普遍的是稳压电源即恒压源,恒流源技术难度高于恒压源,尤其是输出恒定微小电流。输出电流越小,实现难度和价格越高,影响了它的推广和应用。文章先从经济适用的角度介绍了基于电子负载的恒定小电流的实现方法和一般步骤,电子负载串联在有源电路中可以以微小电流的方式“取用”电源,实现稳压电源输出恒定微小电流。再通过实验验证输出微小电流的大小及稳定性,并从电子负载的原理上给出了恒定小电流的本质,讨论分析了电子负载的三种常用工作模式对电路的影响。为实现满足精度要求的恒定微小电流提供了可行的选择。The constant current is generally obtained from the power supply.The more common one in the market is a stabilized voltage supply,that is,a constant voltage source.The technical difficulty of a constant current source is higher than that of a constant voltage source,especially for outputting a constant small current.The smaller the output current,the higher the difficulty and price of realization,which affects its promotion and application.The article first introduces the realization method and general steps of constant smalll current based on electronic load from an economical and applicable point of view.The electronic load can be connected in series in an active circuit to"take"the power supply with a small current to achieve a constant and small output of the stabilized power supply.Current.Then through experiments to verify the size and stability of the output small current,and from the principle of the electronic load given the nature of the constant small current,discussed and analyzed the impact of the three common operating modes of the electronic load on the circuit.It provides a feasible choice for achieving a constant small current that meets the accuracy requirements.

关 键 词：电子负载 微小电流 稳压电源 实现方法 原理分析 

分 类 号：TM933.1[电气工程—电力电子与电力传动]