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UPS(uninterruptible power supply)is the battery (mostly lead-acid maintenance-free battery) connected to the host computer, through the main inverter put the direct current change City normal voltage to work for system equipment.It is mainly used to provide stable power for single computer, computer network system or other power electronic device.In the normal mains input, UPS will be used after the mains voltage supply load equipment, at this time of the UPS is an ac mains voltage regulator;In the mains interruption (forced outage), UPS battery  can supply 220 v alternating current (ac) immediately, by inverter zero switching conversion method to the load continues, make the load to maintain normal work and protect the software and hardware load from being damaged.UPS usually provide protection for the equipment in overhigh voltage or under lower voltage.