UPS basic knowledge

Date:Aug 12, 2019

UPS is the abbreviation of the English "ninterrupTIblepowerSupply", which can ensure that the computer system continues to work for a period of time after the power outage, so that the user can save the disk urgently, so that you do not affect the work or lose data due to power outage. It plays two main roles in computer systems and network applications: first, emergency use, preventing sudden power failure and affecting normal work, causing damage to the computer; second, eliminating power surges on the mains, instantaneous high voltage, and instant "Power pollution" such as low voltage, wire noise and frequency offset improves power quality and provides high quality power for computer systems.

From the basic application principle, UpS is a power protection device that contains an energy storage device, with the inverter as the main component and the regulated frequency output. Mainly composed of rectifier, battery, inverter and static switch.

1) Rectifier: A rectifier is a rectifying device, which is simply a device that converts alternating current (AC) to direct current (DC). It has two main functions: first, to convert alternating current (AC) into direct current (DC), filtered to supply the load, or to the inverter; second, to provide the charging voltage to the battery. Therefore, it also acts as a charger at the same time;

2) Battery: The battery is used by UpS as a device for storing electric energy. It is made up of several batteries connected in series, and its capacity determines the time for maintaining discharge (power supply). Its main functions are: 1 When the mains is normal, the electric energy is converted into chemical energy and stored inside the battery. 2 When the mains fails, the chemical energy is converted into electric energy and supplied to the inverter or the load;

3) Inverter: Generally speaking, an inverter is a device that converts direct current (DC) into alternating current (AC). It consists of an inverter bridge, control logic and filter circuit;

4) Static switch: Static switch, also known as static switch, is a kind of non-contact switch, which is an AC switch composed of two thyristors (SCR) reverse parallel, which is closed and opened by the logic controller. control. Divided into two types of conversion and parallel. The conversion type switch is mainly used for two-way power supply system, and its function is to realize automatic switching from one way to another; and the type switch is mainly used for parallel inverter and mains or multiple inverters.

At present, mainstream UpS vendors include ApC, Shant, etc., which provide various levels of UpS to meet the needs of different user groups.

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