With the rapid development of the air traffic control radar system and the continuous advancement of its technology, the requirements for the internal control system of the air traffic control radar are also getting higher and higher [1]. As the source of power for the normal operation of the air traffic control radar, the measurement and control of the power supply system of the air traffic control radar is even more important. Whether the power supply works normally or not will directly affect the performance of the ATC radar, so the power measurement and control system is an indispensable and important part of the ATC radar [2].
In order to eliminate power failure, it is necessary to understand the state of the power supply in real time [3]. This requires the real-time fault data of the power source to be captured at the moment of power failure, and can be stably saved in the fault environment, and then real-time measurement and control of system power parameters, digital information exchange and fault record display, etc., thereby reducing The skill requirements of operators and maintenance personnel improve the reliability of the system and reduce the average repair time of system failures [4].
1 The overall composition of the system design The overall composition of the system is shown in Figure 1, which mainly includes the PC104 embedded computer, the sensor and its detection circuit part, the contactor and its control detection circuit part.
The embedded computer using the PC104 bus has the advantages of superior hardware performance, mature and reliable, structural standards, easy replacement, and can expand the electronic hard disk, color display card, keyboard interface, printer interface, and various optional function cards. At the same time, the PC104 computer has abundant software resources, such as the support environment of various operating systems and various tool software that can be configured, thus making the software programming and development more rapid and convenient. This system uses the VxWorks real-time operating system as the platform. It includes a microkernel that can provide powerful network support, file system and I / O management, and C ++ programming environment to support various modules.
The power measurement and control system uses Hall element sensors to collect the current and voltage signals of the power supply under test. The signals detected by the sensors are output to the detection circuit as current signals. After A / V conversion, they are sent to AD for analog to digital conversion. , PC104 computer reads the data output by AD and makes corresponding calculations, and then sends the detection results to the remote upper computer through the network for real-time monitoring.
The system also receives the contactor control command sent from the remote host computer, and outputs the contact to the contactor through the control circuit to perform on / off control of a certain power source. At the same time, the state of the auxiliary contact of the contactor is detected by the contactor state detection circuit to observe whether the controlled contactor is in motion, and the detected state is sent to the remote upper computer through the network for real-time monitoring.
2 Sensor and its detection circuit
2.1 Voltage and current sensors The system uses Hall voltage sensors and Hall current sensors. Both are new band sensors that apply the Hall effect and zero-flux principles, and can measure DC voltage or current under isolation. Its main functional features are: (1) the closed-loop compensation characteristics using the Hall principle; (2) has good linearity; (3) optimized response time; (4) wide frequency band, high sensitivity; (5) small size No insertion loss [5].
The input of the voltage sensor is a wide-range DC voltage signal, and the input of the current sensor is a wide-range DC current signal, and the output is a measurement signal of 4 mA to 20 mA.
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