基于CAN总线和LabVIEW的能馈电子负载监控系统

Monitor system of energy-feedback electronic load based on CAN bus and LabVIEW

为了实现对电源老化测试的自动控制和实时数据采集,基于CAN总线和NI的LabVIEW设计了一个能馈电子负载的监控系统。能馈电子负载系统由8个柜子共72个3 kW的电子负载单元组成,每个负载单元都由DSP控制。监控系统由电子负载单元内部的RS-485总线、柜子级的CAN总线以及系统级的CAN总线构成,并开发了基于LabVIEW的上位机人机监控界面。上位机通过三级总线可以和DSP通信,从而控制能馈电子负载系统的启动、停止,并能按照设定的电流值对电源进行测试,在测试过程中实时监测电源的状态。实际应用结果表明,该监控系统实时性好、可靠性高,取得了很好的控制效果。

In order to realize the automatic control and real-time data acquisition during the burn-in test of the power supplies,a monitor system was designed for the energy-feedback electronic load system with CAN bus and LabVIEW.The energy-feedback electronic load system contains 72 electronic load units with 3 kW which distribute in 8 cabinets.Each unit was controlled by DSP.The monitor system consists of RS-485 buses inside the units,CAN buses of cabinet level and one CAN bus of system level.By means of LabVIEW,a human machine interface（HMI） for monitoring and controlling was developed on PC.With the 3-level buses,the PC can communicate with each DSP and start or stop the whole electronic load system.Furthermore,the output currents of power supplies under testing were set by PC.The monitor system acquires the real-time output voltages and currents of the power supplies during the test.The practical results demonstrate that the monitor system is real-time and reliable.It achieves good performance.