普朗克常数h测定系统中磁场线圈稳流源研究  

Special Constant Current Source for Magnetic Field of Measuring System of Planck's Constant

作　　者：王农[1] 韩冰[1,2] 贺青[2] 张钟华[2] 李小亭[1] 

机构地区：[1]河北大学质量技术监督学院,河北保定071002 [2]中国计量科学研究院,北京100013

出　　处：《电测与仪表》2011年第7期1-6,共6页Electrical Measurement & Instrumentation

基　　金：国家科技支撑计划资助项目(2011BAI02B03);国家自然科学基金面上项目(51077120)

摘　　要：在建立我国普朗克常数h测定系统中,对高稳定度直流电源提出了新的要求。本文提出一种基于串联补偿型的专用磁场稳流源。通过设计特殊的采样电阻,选用稳定的基准电压,优选性能突出的运放,并针对感性负载进行关键的补偿,搭建了一套稳定度达到4.5×10-6/30min的稳流源,可用作现阶段普朗克常数h测定系统的磁场稳流源。A constant current source with high stability is required in establishing measuring system of Planck＇s constant.The technique based on series compensation type for special constant current source for magnetic field was described.Therewith the constant current source with 4.5×10-6/30min stability was constructed through designing the extraordinary sampling resistor,selecting stable voltage reference and operational amplifier with outstanding properties,offsetting the phase shift of inductive load.As a special constant current source for magnetic field,it presently could serve for the measuring system of Planck＇s constant.

关 键 词：普朗克常数h 磁场稳流源 基准电压 采样电阻 MOSFET 

分 类 号：TM933[电气工程—电力电子与电力传动]