What types of UPS power supply are classified according to the working principle? UPS uninterruptible power supply is divided into three categories: backup, online and online interactive UPS. The performance of UPS power supply from high to low is: online double transformation, online interactive, backup type. Price is generally proportional to the performance. Understanding the working mode of the UPS power supply can help to better protect the UPS power supply in the daily maintenance.
What types of UPS power supply are classified according to the working principle?
The UPS power supply is what we often call the UPS uninterruptible power supply. The UPS power supply works in the following three modes:
1. The backup UPS power supply is directly supplied from the mains to the load when the mains is normal. When the mains exceeds its working scope or the power failure, the power supply is converted to the battery inverter through the conversion switch. It is characterized by simple structure, small volume and low cost, but the range of input voltage is narrow, the output voltage is relatively stable and the accuracy is poor, there is switching time, and the output waveform is generally square wave.
Backup sine wave output UPS power supply: the unit output can be 0.25KW~2KW. When the mains changes between 170V~264V, the UPS exceeds the 170V~264V.
2. Online interactive UPS power supply is directly supplied from the mains to the load when the mains is normal. When the mains is low or high, the internal voltage regulator line of the UPS is output. When the UPS power supply is abnormal or blackout, the power supply is converted to the battery inverter through the conversion switch. It is characterized by a wide input voltage range, low noise, small volume and other characteristics, but there is also a switching time.
The online interactive UPS power supply has filtering function, strong anti-city interference ability, conversion time less than 4ms, and inverter output is analog sine wave, so it can be equipped with servers, routers and other network equipment, or used in areas with harsh power environment.
3. Online UPS power supply, when the mains is normal, the mains provides the DC voltage to the inverter to the load; when the mains is abnormal, the inverter is powered by the battery, and the inverter is always in the working state to ensure uninterrupted output. It is characterized by a very wide input voltage range, basically no switching time and output voltage stability and high accuracy, especially suitable for high power supply requirements, but the relative cost is high. At present, the UPS power supply with power greater than 3 KVA is almost all online UPS power supply.
Online UPS power structure is complex, but has perfect performance and can solve all power supply problems, such as four-way PS series, which is able to output pure sine wave AC continuously at zero interruption, and can solve all power problems such as spike, surge, frequency drift; requiring large investment, it is usually used in demanding power environment of critical equipment and network center.
Four modes of UPS UPS operation
Depending on the usage situation, the UPS uninterrupted power supply can be converted to four different working modes: normal operation mode, battery operation mode, bypass operation mode and bypass maintenance mode.
1. normal operation
Under normal circumstances, the power supply principle of UPS uninterrupted power supply system is to convert the AC input power to direct current when the city is normal, and then charge the battery for use of power interruption; it should be emphasized that the UPS power supply system does not work when the power failure, if the voltage is too low or too high, instantaneous burst to affect the power quality of the normal operation of the equipment, the UPS system is in the working state to provide stable and clean power supply for the load equipment.
2. Bypass operation
When the mains is normal, when the UPS power appears overload, bypass command (manual or automatic), the inverter overheating or machine failure, the UPS power generally turns the inverter output to bypass output, that is, directly supplied by the mains. Since the UPS output frequency phase should be the same as the mains frequency during bypass, the phase lock synchronization technology is adopted to ensure that the UPS power output is synchronized with the mains frequency.
3. Bypass maintenance
When the UPS emergency power supply is repaired, setting the bypass manually ensures the normal power supply of the load equipment. When the maintenance operation is completed, the UPS power supply is restarted, and the UPS power supply turns to normal operation.
4. back-up battery
Once the mains is abnormal, UPS will convert the direct current stored in the battery to alternating current. At this time, the input of the inverter will be supplied by the battery pack, and the inverter will continue to provide power and supply the load to continue to use to achieve the function of continuous power supply.
Above is the classification of the UPS uninterruptible power supply, the UPS power supply is actually a special power supply device used to ensure the safety of electronic devices. When the mains works normally, it can play the role of stabilizing the pressure, so as to ensure the safety of electricity, if the mains is cut off, there is a power failure accident, it can convert the original electric energy into the normal voltage value of the mains to provide emergency electricity.
Post time: Jul-10-2023
