1553B总线模块上电启动异常故障的分析与解决

Analyze and solve about last electricity start abnormal of 1553B data bus

机载计算机在系统上电时,1553B总线模块出现上电启动异常。从故障机理,时序逻辑和复位电路等方面分析,通过常温、高低温环境下的信号波形反复测试。分析定位为上电复位电路中的某电容导致上电复位信号爬升缓慢,产生抖动,引起1553B总线模块上电启动异常现象,对于此类现象采取有效措施,消除故障。

When the airborne computer at system up time, the 1553B data bus appear the start abnormal condition~ Analysis from the aspect of break down mechanism, the cycle time logic and reset electric circuit,test several times about the wave of the signal under normal,high and low temperature environment,After analyze,the reason for the abnormal was caused by an electric capacity in the wire reply an electric circuit up,the electric capacity caused the signal of start upset rise slowly,and also create trembles,and then the 1553B data bus show abnormal. Adopt valid measure to this kind of phenomenon, the cancellation break down.