1) Rectifier: A rectifier is a rectifier device that converts AC (alternating current) into DC (direct current). It has two main functions: first, to convert AC (alternating current) into DC (direct current), which is filtered and supplied to the load, or to the inverter; Secondly, provide charging voltage to the battery. Therefore, it also serves as a charger;
2) Inverter: Simply put, an inverter is a device that converts direct current (DC) into alternating current (AC). It consists of an inverter bridge, control logic, and filtering circuit;
3) Battery: A battery is a device used by UPS to store electrical energy. It is composed of several batteries connected in series, and its capacity determines the duration of its discharge (power supply).
Its main functions are:
- When the mains power is normal, convert electrical energy into chemical energy and store it inside the battery.
- When there is a power failure, convert chemical energy into electrical energy to provide to the inverter or load;
4) Static switch: Static switch, also known as static switch, is a contactless switch that is an AC switch composed of two thyristors (SCR) in reverse parallel. Its closing and opening are controlled by a logic controller. It is divided into two types: conversion type and parallel type. The conversion switch is mainly used in systems powered by two power sources, and its function is to achieve automatic switching from one power source to the other; Parallel type switches are mainly used for parallel inverters and mains or multiple inverters.
UPS power supply is composed of a set of AC+DC charging+AC/DC inverter devices. The battery in UPS is in a charging state when the mains power supply is normal. Once the mains power is interrupted, the battery immediately outputs the stored DC power to the inverter to supply the computer equipment with AC power, maintaining the continuity of power supply to the computer equipment. In general, the power supply of small and medium-sized backup UPS is maintained by batteries for about 10-30 minutes.
When the voltage of the power grid is working normally, power the load as shown in the figure, and at the same time, charge the energy storage battery; When there is a sudden power outage, the uninterruptible power supply starts to work and is supplied by energy storage batteries to maintain normal production. When the load is severely overloaded due to production needs, the grid voltage is rectified to directly supply power to the load.