1、 Basic principles of UPS

-UPS mainly consists of rectifiers, inverters, batteries, static switches, and other components. The rectifier converts AC power into DC power, which charges the battery and supplies the inverter. The inverter converts DC power back to AC power, providing stable power to the load. When the mains power is cut off, the battery continues to supply power to the load through the inverter, achieving uninterrupted power supply.

2、 Technical parameters

-Capacity: In volt ampere (VA) or kilowatt (kW) units, it represents the maximum power that UPS can provide, and should be selected reasonably based on the load power. For example, if the total power of the load is 1000W, considering a certain margin, a UPS of around 1500VA can be selected.

-Input voltage range: indicates the allowable range of mains input voltage for UPS normal operation, and a wider range can adapt to voltage fluctuations in the power grid.

-Output voltage accuracy: The deviation range between the output voltage and the rated voltage. High precision output can better protect load equipment.

-Conversion time: The time for switching between mains power and battery power supply. The online UPS conversion time is very short and can achieve seamless switching.

3、 UPS classification

-Offline UPS: simple structure and low cost. When the mains power is normal, it directly outputs the mains power, and only switches to the battery inverter power supply mode when the mains power is abnormal, but the switching time is relatively long.

-Online UPS: always outputs power to the load through the inverter. When the mains power is normal, the inverter is powered by the rectified mains power; When the mains power fails, it is powered by the battery, with short conversion time and high output voltage quality.

-Online interactive UPS: Combining the characteristics of offline and online, it stabilizes the mains power through a transformer and outputs it while charging the battery during normal operation; When the mains power is abnormal, switch to battery inverter power supply.

4、 Battery management

-The battery is an important component of UPS, and attention should be paid to the charging method (such as float charging, equalization charging), charging current, battery life, etc. Regularly maintain the battery, including checking the appearance and connection of the battery, testing the battery capacity, etc.

5、 Installation and usage precautions

-The installation location should be well ventilated, dry, and avoid direct sunlight and proximity to heat sources. When connecting loads, it is important to ensure that the total power of the loads does not exceed the rated capacity of the UPS, and that they are properly grounded to ensure safety.