一种机载系统离散量采集接口电路设计

An Interface Circuit of Discrete to Digital on Airborne System

针对机载系统多路离散量采集接口电路的要求,研究了基于离散量采集芯片的多路离散量采集电路的设计。介绍了两种不同类型的离散量信号,并采用离散量芯片设计的方法,保证了两种类型多路离散量的采集和转换并具有雷电防护和接口自测试功能。同时利用FPGA实现了离散量采集芯片和主控之间的数据交换。最后经过实验测试,系统具备较强的现实意义,适用于航空领域机载系统的离散量采集需求。

In allusion to the requiremrait of multi-cbannel discrete input signal for airborne system,this paper proposes a circuit of multi-channel discrete input signal based on discrete inta＆ce IC.TWo kinds of different discrete signals are introduced and the method using discrete IC with lightning protection and built in test guaranteed the conversion of multi-chamel discrete input signal.FPGA is used to implement the canversion between discrete IC and the controller.Experimental results show tiiat tiie system can meet the requirement of multi-channel discrete input signal well and it has practical significance to airborne system.