基于纯硬件电路的三余度信号表决器设计

Design of Triple Redundancy Signal-voter Based on Pure Hardware Circuit

针对数模混合式机载控制系统输出的多余度控制信号、模拟式机载控制系统设计中余度输入输出信号综合难度大的问题,对较典型的三余度信号设计了纯硬件的表决器。利用高增益运算放大器对最小及最大信号输入作用的正反饱和特性,并通过将正反饱和作用相互抵消的方法,实现了模拟三余度信号的中值选择;借助于继电器的对电压控制信号的自我识别方式,实现了三余度电压控制信号的多数表决。仿真及测试表明,所设计的三余度信号硬件表决器能够简单有效地解决数模混合式控制系统三余度指令输出的综合问题,以及模拟备份控制系统三余度信号的输入与输出表决,从而能够简化余度系统的设计,提高系统可靠性。

For the big difficulty of synthesizing redundant electrical redundant control signal in the digital-analog hybrid airborne control system and electrical redundant input signal in the analog airborne control systems, pure hardware voters for analog signal and voltage signal were designed in this paper based on triple redundancy. By using high- gain operational amplifier positive and negative saturated to the minimum and maximum signals, and thus offset the function of the two signals then the middle value was selected. By self-recognition of relays to voltage control, a majority voter was achieved. Simulation and test results shows that the design of the triple redundancy signal hardware voter can simply and effectively achieve the middle value of the three signal selection function in digital-analog hybrid and analog airborne systems, and thus simplify the design of the redundancy system.