UPS是一种储能装置，当正常交流电源中断时，将蓄电池的直流输出转换为持续交流供电的重要外部电源装置。从原理上讲，它是一种集数字和模拟电路、自动控制逆变器、免维护储能装置于一体的电力电子设备。从功能上讲，UPS可以在电源出现异常时，有效地净化市电；在突然停电的情况下，还可以为计算机等设备提供一定时间的供电，让您有充裕的应对时间。从用途上讲，UPS广泛应用于从信息的采集、传输、处理、存储到应用的各个环节，其重要性随着信息应用重要性的提高而日益提高。
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