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UPS（不间断电源）是伴随计算机的诞生而出现的。随着网络的迅速发展， UPS也被大规模地使用到网络中，成了网络系统安全运行的重要保障。尽管 UPS技术的发展不像计算机技术那么迅猛，但也是今非昔比。早先的 UPS电源使用飞轮等惯性系统来达到输出电压的稳定，掉电后的输出维持
UPS (uninterruptible power supply) is accompanied by the birth of the computer appeared. With the rapid development of the network, UPS has also been used on a large scale in the network and has become an important guarantee for the safe operation of the network system. Although UPS technology is not as fast as computer technology, it is not the same. Previous UPS power supply using flywheel inertial system to achieve the stability of the output voltage, power output after the maintenance