Design of Aviation AC/DC Contactor Life Test System Based on PXI-2204 and CPCI-7434

The health status and operation life of aviation contactor are closely related to the safety of airborne power distribution system. This paper designs and builds a set of aviation contactor life test platform. The proposed circuit topology can perfectly realize the operation life test of contactor under different working conditions, and the invalid switching operations of the components are greatly reduced, so as to improve the contactor test experimental efficiency. The peripheral circuit adopts the driving circuit with CPCI-7434 digital I/O board, the signal acquisition and conditioning circuit with PXI-2204 data acquisition card and the power supply circuit. The full-automatic control life cycle test interface is designed by LabVIEW in order to collect and display the voltage and current signals of contactor contacts and coils. In addition, after system joint debugging, the whole set of life test platform successfully achieve designed functions, such as data output and storage in real time, ensure the visualization and operability of the whole test system on the premise of friendly human-computer interface.