What are the classifications of UPS power supplies?
UPS power supply is one of the commonly used power supply types. Some people may ask, what is UPS power supply? In fact, UPS power supply is also an uninterruptible power supply.
According to the new standard IEC (International Electrotechnical Commission), UPS is divided into the following 3 categories according to its structure and operating principle:
(1) Passive backup UPS power supply
It means that the inverter is connected in parallel between the mains and the load and is simply used as a backup power source. This kind of UPS power supply, when the mains power is normal, the load is completely and directly supplied by the mains, the inverter does not do any electric energy conversion, and the battery is powered by an independent charger; when the mains is abnormal, the load is completely inverted The device provides power.
Passive backup UPS has the advantages of simple structure and the cheapest price. It is used for some non-important loads, such as home computers. However, when the mains power fails, the relay will switch the inverter to the load. The switching time is longer, usually a few milliseconds interruption, so the passive backup UPS power supply should not be used for slightly important computer equipment.
(2) Online interactive UPS power supply
Means that the inverter is connected in parallel between the mains and the load, acting as a backup power source, and the inverter is used as a charger to charge the battery. Through the inverter's reversible operation mode, it interacts with the mains, so it is called interactive. This kind of UPS power supply, when the mains is normal, the load is supplied by the improved mains, and the inverter is used as a charger to charge the battery. At this time, the inverter acts as an AC/DC converter; and when the mains In the event of a fault, the load is completely powered by the inverter. At this time, the inverter functions as a DC/AC converter.
Online interactive UPS has the advantages of simple structure, convenient implementation, easy parallel connection, easy maintenance and repair, high efficiency, low operating cost, high reliability of the whole machine, etc. Its performance meets certain load requirements, and is especially suitable for certain computers in the network The equipment adopts a distributed power supply system. The disadvantage of this type of power supply is that its voltage stabilization performance is not high, especially the dynamic response speed is low, and the anti-interference ability is not strong, and the circuit will produce harmonic interference and modulation interference.
(3) Double conversion UPS power supply
Means that the inverter is connected in series between the AC input and the load, and the power supply continuously supplies power to the load through the inverter. The power supply mode of this kind of UPS power supply is as follows: when the mains power is normal, the mains supplies power to the load through the rectifier and inverter; when the mains power is abnormal, the storage device supplies power to the load through the inverter.
Double-conversion UPS is the mainstream product of UPS power supply. It has the advantages of good performance, high voltage stability and frequency stability, strong functions, hot backup connection and parallel redundant connection functions. Its disadvantage is that when the capacity is less than Below 10kVA, the efficiency of the whole machine is not high, generally around 85%.
Hope the artical to help you have a certain understanding of UPS power classification, More information also could contact LEBEKAN for details.