开关电路潜通路分析的一种方法

One sneak circuit analysis method for the switch circuit

对开关电路建立图论模型,用功能支路和开关支路反映潜通路分析中的两类重要影响元素,用支路状态变量反映开关电路中支路的双态性.分析实际系统中各分系统接口模型的特点,利用开关函数的特点简化系统的潜通路分析.对开关函数的规范化形式进行变换,反映出功能支路和开关支路的关系,得到实际电路实现的功能数和实现各种功能的途径数.通过实际数目与设计数目的对比,定性地判定出电路中是否存在影响设计功能的潜通路和影响功能实现方式的潜通路.在此基础上有针对性地利用开关器件各种状态组合时实际路径与设计路径的比较,确定具体潜通路的位置.将该方法应用于典型的潜通路案例中,发现了系统中的潜通路问题,表明该方法快速有效,可以应用于工程分析.

The switch circuit was modeled by graph theory model.The function edge and the switch edge were two important factors in the sneak circuit analysis.The two states of edge were represented by the edge state variable.The characters of the interface in the circuit were studied and the sneak circuit analysis was simplified.The relationships between the function edge and the switch edge were showed by changing the standard format of the switch function.The number of the system functions and the methods of function realized were obtained.Whether there were sneak circuits which influence the design functions in the system were determined by using the comparison between the numbers in the design circuit and the actual circuit.The position of the sneak circuit can be known by analyzing the actual circuits in different combination of switches.The sneak circuit problem was found when use this method to analyze the typical sneak circuit example.The results show this method can be used to analyze the sneak problem quickly and effectively at engineering analyses.