HL80型低纹波系数大电流程控恒流源研制
Development of HL80 low ripple high current computer-controlling constant current source
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摘要: HL80型大功率恒流源采用闭环实时串联线性调整技术实现输出电流的恒流控制，应用三相交流调压模块调控电源变压器的初级电压，以可编程控制器与触摸屏配合实现图形化的交互式操作界面，采用以太网构成通讯控制网络。当负载在2.0 ～3.0 Ω之间变化且输出电流在20～80 A之间变化时，HL80型恒流源的调整管压降可控制在(8±2) V范围内，输出电流稳定度优于0.12%，纹波系数优于0.11%。样机实现万次拷机实验无故障。Abstract: In HL80 constant current source, a closed-loop negative feedback and real time serial linear adjustion circuit is adopted for the control of the output current. Triphase AC voltage-modulation module is used to modulate the primary voltage of the transformer. The combination of PLC and touch-screen actualize the graphical interactive operation interface. The communication and control in HL80 is based on ethernet networks. As the load is changed from 2.0 to 3.0 Ω and the output current is changed from 20 A to 80 A, the voltage drop of the modulation transistor is controlled as 8 V±2 V, the precision of the output current is better than 0.12%, the ripple factor is lower than 0.11%. HL80 has been tested more than 10 000 shots without failure.
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