基于恒流输出的指令控制设备的设计与实现

Design and Implementation of Command Control Equipment Based on Constant Current Output

为实现某地面测试设备16路控制指令的输出,完成对被测设备的自动化驱动控制,基于恒流输出并结合FPGA提出一种集成于PXI机箱的16路控制指令输出系统的自动化设计。在传统恒压输出的基础上引入LT3082设计恒流源输出,通过自检回路及备选输出的设计完成对设备的闭环控制;基于PXI架构,以FPGA为主控芯片,可配置全部16路控制指令独立输出,结合自检回路实现对设备工作状态的检验、指令输出状态的检查。结果表明,该设计在恒流输出的基础上能实现定时通断、脉冲输出、系统自检和状态查询等功能。

In order to realize the output of 16-channel control instructions of ground test equipment and complete the automatic drive control of the equipment under test, an automatic design of 16-channel control instruction output system integrated in PXI chassis is proposed based on constant current output and FPGA. Based on the traditional constant voltage output, LT3082 is introduced to design the constant current source output, and the closed-loop control of the equipment is completed through the design of self-checking circuit and alternative output;based on PXI architecture, FPGA is used as the main control chip, and all 16 control instructions can be configured to output independently, which can be combined with the self-checking circuit to check the working status of the equipment and the output status of the instructions. The experimental results show that the design realizes the functions of timing on-off, pulse output, system self-test and state query based on constant current output.