[0009] The present invention will be further described below with reference to the drawings and typical embodiments.
[0010] Reference attached figure 1. This embodiment includes 1 is a power supply module, which provides the working voltage of each functional chip in the monitoring system; 2 is an inert gas detection module, which detects the inert gas pressure value in the coaxial transmission line in real time; 3 is an A/D conversion module, which converts the pressure value into Corresponding acquisition voltage; 4 is the limit feedback module, the travel sensor signal is sent to the FPGA control module through the feedback module; 5 is the RS485 module, responsible for the transmission of control commands to the remote console; 6 is the FPGA control module; 7 is the UART module , Realize the serial and parallel conversion of transmission data inside the FPGA, and realize the function of universal asynchronous transceiver; 8 is the air pressure control module, including the drive circuit that executes the charge and exhaust commands issued by the FPGA control; 9 is the air pressure control module, including the implementation of FPGA The drive circuit that controls the issued coaxial switching command; 10 is the inflation and exhaust device outside the controller; 11 is the coaxial switching device outside the controller.
[0011] The working principle of this embodiment is: when the system is working, the RS485 module 5 and the UART module 7 receive the monitoring command from the remote control terminal, and the limit feedback circuit 4 reads the status signal of the stroke sensor and sends it to the FPGA control module 6. The inert gas detection module 2 reads the analog signal of the pressure transmitter and sends it to the FPGA control module 6 through the A/D conversion module 3. The FPGA control module 6 performs judgment and analysis according to the monitoring command, and sends it to the air pressure control module 8 according to the comparison result. Sending control signals, the air pressure device is driven by the driving circuit in the air pressure control module 8. In this process, the air pressure detection module 2, A/D conversion module 3 and FPGA control module 6 collect and process data in real time. After meeting the monitoring command requirements, Finally, the FPGA control module 6 sends an operation command to the coaxial switching module 9, and the operation of the switching device 11 is driven by the driving circuit in the coaxial switching module 9. In case of any abnormality, an optical alarm is issued.
[0012] The main functions of the work of this embodiment are: (1) Real-time accurate detection of the coaxial transmission state, and the air pressure error rate is reduced to three in ten thousand. (2) Automatically monitor the transmission status during the whole process, and perform feedback control of inert air pressure. (3) Work normally under strong electromagnetic interference and large temperature drop environment. (4) The system self-checking function will automatically sound an alarm in abnormal situations.
[0013] Reference attached figure 2. In this embodiment, the power supply module 1 is composed of U15, which provides DC24V, 3.3V, and 1.2V respectively. U1 is the FPGA chip XC3S50-TQ144, used for asynchronous data sending and receiving, signal data analysis and processing, and coordinated control between chips. U14 is the core chip of the RS485 module, which is used for the read-write interface between the 485 bus and the FPGA. U2, U3, U4, U7 are 74HC14 six inverted Schmitt trigger integrated chips, which can play the role of anti-interference and signal shaping and then transmit them to the FPGA chip in parallel. U17 is a pressure transmitter HUBA50081, which provides the conversion from air pressure to voltage signal. U5 is a 16-bit LTC1606 data acquisition chip for high-precision acquisition of the analog signal of the pressure transmitter U17. U10 and U11 are MC1413 inverted driver chips, used to drive terminal relays or solenoid valves. U9 is a PC817 optocoupler chipset, a total of 8 PC817, used for signal feedback and isolation of interference signals. U6 is a PC817 optocoupler chipset, a total of 4 PC817, used for signal feedback and interference signal isolation. U8 is an LED diode, which provides an alarm signal when the coaxial transmission is abnormal. U12 is the crystal oscillator chip to provide the system clock. U13 is the online programming interface of FPGA.
