高电磁兼容性大功率恒流源设计与实现

摘要

"神龙-Ⅱ"直线感应加速器运行时在其周围环境中产生较强的电磁干扰,严重影响恒流源等重要设备的运行.系统地分析了电磁干扰信号特征,在此基础上,采用全数字全光纤控制、电流/电压双闭环反馈控制等高可靠性电路设计,并综合应用共扼串扰脉冲抑制、分离地线及光电隔离等抗干扰措施,研制成功可在强电磁干扰环境下稳定运行的HL90型低纹波系数大电流程控恒流源,有力地保障了"神龙-Ⅱ"装置的正常运行.%High intensity electromagnetic interference will be induced during the operation of the "Dragon-Ⅱ"linear induc-tion accelerator,which will interfere the operation of the key equipments such as the constant current supply.The characteristics of the interference signal was analyzed throughly.Then the high reliability circuit for the constant-current supply was designed based on the comprehensive application of several techniques,such as the digital fiber communication system and the dual loops current and voltage feedback control system.Combined with the application of the common mode inductor,the isolation ground and the optical-electronically isolation module,the electromagnetic compatibility of the HL90 constant-current supply was im-proved greatly.The low ripple high current HL90 worked well in the high intensity interference circumstance.The coefficient of the ripple was less than 0.11％,the drift was less than 0.12％ and the malfunction percentage was less than 0.01％.This is helpful for the success of the "Dragon-Ⅱ"LIA.