高稳定度磁体电流测量系统的研究和设计

摘要

40 T hybrid-magnet superconducting outsert requires a highly stabilized power supply whose DC ripple current request limits in ±5 ppm of 16 kA.The control method used is based on a digital regulation loop,so the measurement of the magnet current becomes the limiting factor for highly stability.And,the resolution of analog measurement system must better than 10 μV.For the design of such Highly Stabilized magnet current Measurement System,this paper first analyzes the impact of system noise and temperature characteristic.Then,the actual circuit is given.Finally,the experimental results show that this measurement circuit meets requirements.%40T混合磁体外超导磁体需要高稳定度电源,其输出电流纹波要求控制在-±5 ppm以内(额定电流为16 kA).电源控制系统是基于数字调节环,所以电源稳定度主要受限于磁体电流的测量.而且,模拟测量系统的输入分辨率要优于1OμV.对于这样一个高稳定度的模拟测量系统的设计,首先分析了系统噪声和温度特性对测量系统的影响,然后给出了实际的电路.最后通过实验验证该电路满足要求.