大功率恒流源是强流直线感应加速器(LIA)的关键设备之一, 用于为加速器电感线圈提供大功率准直流驱动电流, 其稳定度、纹波系数等指标要求极高。神龙-Ⅲ LIA恒流源采用串联线性双闭环回路双参量电流调控技术, 同时综合应用了以PLC控制器为核心的本地控制、以ARM控制器和工控机为核心的远程控制以及以太网网络通讯技术, 实现了强电磁干扰环境下远程控制高稳定性运行。该恒流源在负载0.5~0.6 Ω之间变化、输出电流在50~170 A之间变化时调整管压降控制在8 V±2 V范围内, 输出电流纹波和电流稳定度均优于0.5‰。

The high power constant current source is one of the key equipments of the high current linear induction accelerator (LIA) which outputs high power direct current to power the inductor. The requirement of the parameters such as instability, ripple coefficient is very strict. The serial linear dual-loop dual-parameters feedback control technical was applied in the design of the constant current source of Dragon-Ⅲ LIA to adjust the output current. In this device, the local control system based on the PLC controller, the remote control system based on the ARM controller and computer, and the communication system based on the Ethernet were comprehensively applied in the design of the control system, which made its stability very high as it operated under remote control model in high electromagnetic interference circumstance. As the resistance of the load change among 0.5-0.6 Ω and the current change among 50-170 A, the voltage drop of the transistor was restricted at 8 V±2 V, and the ripple coefficient and the drift of the current were less than 0.5‰.