Abstract: For UPS power monitoring inadequacies, this paper introduces the design of the real-time online monitoring system. This paper designs the system hardware function module, and specific circuit principle diagram. And then, it applies a Markov theory to analyzing and modeling the reliability model of a single hardware function module and the whole system. It uses the model to quantitatively calculate the reliability of single hardware modules and the whole system. Through calculation and analysis, the method has practical value.

Key words: Uninterrupted Power Supply（UPS）, online monitoring, reliability, Markov theory

摘要： 针对UPS电源监控方面存在的不足，设计了实时在线的监控系统。设计了系统的硬件功能模块，给出具体电路原理图；应用Markov理论，对系统的单个硬件功能模块和整个系统进行了可靠性分析与建模；应用所建立的模型，对单个硬件模块的可靠度和系统的可靠度进行了定量计算。通过分析计算，提出的方法具有一定的实用性。

关键词: 不间断电源（UPS）, 在线监控, 可靠性, Markov理论