When the mains input is normal

When the mains input is normal, UPS will supply the electricity regulator to the load, in which case the online offline ups is an alternating electric regulator, while also charging the energy storage device such as a battery pack; When the mains interruption (accident blackout) when, UPS immediately energy storage device (such as a battery or flywheel energy storage system) through an inverter to convert alternating current to the load supply methods continue to make to maintain the normal work load and protect the load software and hardware from damage . UPS devices usually low voltage and voltage are too large to provide protection.