UPS is an energy storage device that contains, as the main components in the inverter, voltage regulator, stable output frequency of power protection equipment. Its main role: emergency use, to prevent a sudden power failure affecting the normal work, or even damage the system; eliminate electricity surges, instant high voltage, instantaneous low voltage, wire noise and frequency offset and other "power pollution", the system provides high power quality and stability. Currently, UPS has been widely used in many fields, and started to enter the home, manufacturers are APC, Hill PL.
A, UPS components
Mainly by the UPS rectifier, battery, inverter and static switch and other components.
1, the rectifier. AC into DC, after the supply of filtered load or inverter; the same time, to provide livestock battery charging voltage, the charger from the role.
2, the battery. UPS used to store electrical energy, by a number of batteries in series, the size of its capacity to maintain supply determines the length of time. Mains is normal, to convert electrical energy into chemical energy stored in the battery; mains failure, the chemical energy into electrical energy supplied to the inverter or the load.
3, inverter. The inverter bridge control logic and filter circuit, the direct current into alternating current.
4, the static switch. Formed by two parallel thyristor reverse a non-contact switch, the open / close control by the logic controller, and the models point conversion type and two. The former are used for two-way power supply system, to achieve automatic switching between the two, which are used for parallel inverters with mains or inverter.

Two, UPS optional
Optional UPS should be chosen based on the most suitable UPS.
1, confirm the need for a UPS type. On the current situation in terms of power, UPS power protection equipment is necessary. Different needs of different users of the UPS. For example, the critical equipment necessary to use high performance, high security system line UPS, to arrive to engage in high-voltage grid, spikes, surges, interference, output pure power; personal or home users can use back-up UPS, low price a thin, light, switch to the battery from the mains supply switching time <10MS.
2, determine the need for UPS power. List all equipment to be protected, will power the equipment plus 30% of the aggregate and expand capacity to prepare for system upgrade.
3, to determine the load required to spare the time, when power failure occurs, only a simple operation such as load, you can choose standard UPS; still a long operation such as load, should be selected long-acting UPS.