超高稳定度大直流恒流源的设计  

Design of Ultrahigh-Stability Big DC Constant Current Source

作　　者：占清[1,2] 朱自科[2] 陈勇[2] 张自长[2] 曾舒帆[2] 李亚娟[2] 

机构地区：[1]西南林业大学机械与交通学院,昆明650224 [2]云南省计量测试技术研究院,昆明650228

出　　处：《电子器件》2017年第3期607-611,共5页Chinese Journal of Electron Devices

基　　金：国家重大科学仪器设备开发专项项目(2011YQ090004)

摘　　要：研制的超高稳定度大直流恒流源在国防、计量、精密测量等领域都有着重要的应用价值。该直流恒流源主要采用直流电流比较仪作为反馈采样元件,使用"极低负载效应分布式电阻"作为恒流源的输出信号采样电阻,可降低电阻功耗,温漂减小,噪声有抵消效应,使恒流源的稳定性提高了一个数量级;采用功率管并联,实现大直流输出。测试结果表明:该恒流源稳定性优于0.001%(1 min),最大输出电流达400 A,是一款性能优异的超高稳定度的大直流恒流源。Development of ultrahigh-stability big DC constant current source has important application value in the field of national defense industry,metrology,precision measurement and so on.The design of DC constant current source,DC current comparator was adopted as a sampling element and the Distributed Low Load Coefficient Precision Resistor was used as a constant current source feedback and the output signal of the sampling resistor,so the overall stability of the constant current sources was improved.And the power tube in parallel realized DC constant current source of big current output,thereby the system reliability was also improved.The performance of the designed constant current source is tested,and the results indicate that the source could generate a ultrahighstability current.The stability of the output current is excel to 0.001%（min）,the maximal output current is 400 A and it’s an excellent ultrahigh-stability big DC constant current source.

关 键 词：恒流源 超高稳定 极低负载效应 大电流 直流电流比较仪 

分 类 号：TM9[电气工程—电力电子与电力传动]