When using UPS power supply, it is also necessary to calculate the size of the load and avoid overloading or underloading. Overloading can cause long-term operation in an overloaded state and shorten the service life; If the load is too small and the working circuit operates in an abnormal state for a long time, there is also a certain degree of harm. A reasonable load should be controlled between 50% and 80%. Practice has proven that controlling the output load at around 60% is optimal for good reliability. When overload or inverter failure occurs, it will switch to bypass mode operation, and there is no backup function at this time. The power supply used by the load is directly supplied through the power system.
From the perspective of basic application principles, it is a power protection device that includes an energy storage device, with an inverter as the main component and frequency output regulation. It is mainly composed of rectifier, battery, inverter, and static switch.
1. Rectifiers: Rectifiers are rectifying devices that convert alternating current (AC) into direct current (DC). It has two main functions: first, converting alternating current (AC) to direct current (DC), filtering to power the load, or providing it to the inverter; Secondly, provide charging voltage to the battery. Therefore, it also serves as a charger;
2. Battery: A device that uses a battery to store electrical energy. It consists of several batteries connected in series, and its capacity determines the time required to maintain discharge (power supply). Its main function is: (1) When the mains power is normal, electrical energy is converted into chemical energy and stored in the battery. (2) When the main power supply fails, chemical energy is converted into electrical energy and provided to the inverter or 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 filtering circuit;
4. Static switch: It is a non-contact switch, which is an AC switch composed of two thyristors (SCR) in anti parallel, and its closing and opening are controlled by a logic controller. It is divided into two types: conversion and parallel. The conversion switch is mainly used in bidirectional power supply systems, and its function is to achieve automatic switching from one mode to another; And the type switch is mainly used for parallel inverters and main power sources or multiple inverters.