Understand the use and function of UPS power supply in detail

UPS power supply is a kind of uninterruptible power supply protection equipment with energy storage device, inverter as the main component and stable voltage and frequency output. It mainly provides uninterrupted power supply for computer network system or power electronic equipment. When the mains power input is normal, the ups will supply the mains power to the load after stabilizing the voltage. At this time, the UPS is an AC mains power regulator, which also charges the battery in the machine. When the mains power is interrupted, the UPS inverter will convert to 220V AC to continue to supply power to the equipment, so that the load can maintain normal operation and protect the load software and hardware from damage.

UPS is widely used in mining, aerospace, industry, communication, national defense, hospital, computer business terminal, network server, network equipment, data storage equipment, emergency lighting system, railway, shipping, transportation, power plant, substation, nuclear power station, fire safety alarm system, wireless communication system, program-controlled exchange, mobile communication, solar energy storage Conversion equipment, control equipment and its emergency protection system, personal computer and other fields

UPS power supply system consists of five parts: main circuit, bypass, battery and other power input circuit, rectifier (REC) for AC / DC conversion, inverter (INV) for DC / AC conversion, inverter and bypass output switching circuit and energy storage battery.

The voltage stabilizing function of UPS system is usually completed by rectifier. The rectifier device adopts thyristor or high frequency switch rectifier, which has the function of controlling the output amplitude according to the change of external power. Therefore, when the external power changes (the change should meet the system requirements), the output amplitude is basically the same as the rectifier voltage. The purification function is completed by the energy storage battery. Because the rectifier can not eliminate the instantaneous pulse interference, there is still interference pulse in the rectified voltage. In addition to the direct energy storage function, the energy storage battery is like a large container capacitor connected to the rectifier. Its equivalent capacity is directly proportional to the capacity of the energy storage battery. Because the voltage at both ends of the capacitor can not be changed suddenly, that is to say, the smooth characteristic of the capacitor to the pulse is used to eliminate the pulse interference, which has the function of purification, also known as the interference shielding. The stability of frequency depends on the stability of the oscillation frequency of the converter. In order to facilitate the daily operation and maintenance of UPS power supply system, the system working switch, the automatic bypass switch after the self check failure of the host and the maintenance bypass switch are designed.