UPS, namely, uninterrupted power supply is a type of uninterruptible power supply with energy storage device, inverter as main component, and constant voltage and constant frequency. It is mainly used to provide uninterrupted power supply for single computer, computer network system or other electrical and electronic equipments. When the electric supply input is normal, UPS will stabilize the voltage of the electric supply and supply to load. At this time, UPS is an AC electric supply voltage stabilizer. Meanwhile, it also charge the battery inside the machine; When the electric supply interrupts (accident blackout), UPS will immediately supply constant 220V AC current to the load by means of inversion conversion, making the load maintaining normal work and protect the software and hardware of load from damage. UPS devices usually offer protection to overlarge and too low voltage.

UPS is the third generation power frequency pure online ups systems directed towards reliability requirements on power supply from power grid, network monitoring, network systems and medical systems, overcoming increasingly difficult problems of power supply network environment caused by medium and large computer network system centralized power supply, developed by brand new digital technology. DC power supply is a device to maintain a steady current formed in the circuit such as dry batteries, storage batteries, and DC generators, etc.

UPS and DC power supply are necessary power supply support equipment for enterprises. Their traditional maintenance management includes: first, routine appearance checking. Periodically replace batteries, filter capacitor, and draught fan these quick-wear parts. During overhaul, make battery activation; second, transform or adopt replacement equipments, and use advanced tools to test the battery performance. This management method costs companies high input cost, and takes maintenance staffs large workload. It is not easy to acquire equipment operation status and critical data in real time, and the accident prevention capacity of the equipment is low. Online maintenance management can avoid the shortcomings of the traditional way and get benefits.

UPS is short for uninterrupted power supply, which can protect computer systems, after a power outage, continue to work for a period of time to enable users for emergency file saving so that users would not affect work or lose data due to power outages.

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