Basic working principle of backup UPS
When the mains power supply is normal, the power frequency AC power supplies power to the load through the filter, automatic voltage regulator, and relay contact sl. When the mains power supply is suspended, the UPS power supply manufacturer uses the thatch battery and the inverter to supply power to the load, and the inverter converts the DC power supply into an AC power supply, and supplies power to the load through the relay contact s.
Performance characteristics of backup UPS
The biggest advantage of this UPS is its simple structure, low cost and low noise. UPS power supply manufacturers found that the essential feature of the backup UPS is the high line of the inverter, so the inverter is usually in a standby state. Moreover, because of the small capacity, most of the switching switches use fast-switching relays (2-5mg) instead of static switches with higher-speed switching, so the switching time is relatively long. When the mains power is normal, the UPS directly conducts the mains power to the load end, so there is no rectification, filtering and other functions, and it is easily affected by the grid voltage and harmonic current. Only when the mains input is terminated or the power supply quality exceeds the normal input range of the UPS, the inverter is started to switch to the battery discharge state, and the UPS outputs a quasi-square wave.
Because this type of UPS has a narrow input range, small capacity, and poor output power quality, the overall availability is poor. UPS power supply manufacturers believe that it is only suitable for normal power supply maintenance in non-important occasions such as a single PC, such as home with computer maintenance.
Advantages and disadvantages of backup UPS
1. Advantages
Low product price and low operating cost. Under normal circumstances, the inverter is in a non-working state, and the power of the grid is directly supplied to the load, so the power conversion efficiency of the backup UPS is very high. The battery life is generally 3 to 5 years.
2. Disadvantages
When the grid power supply fails, it takes a long time to switch from the grid power supply to the inverter power supply. For devices requiring high power quality, the length of the transition time is very important. Furthermore, because the inverter of the backup UPS power supply does not work frequently, it is not easy to grasp the dynamics of the inverter, and it is easy to form a hidden fault. Backup uninterruptible power supply is generally used for some non-critical low-power equipment.
Does the UPS backup damage the computer?
The UPS backup power supply is not harmful to the computer, because the UPS power supply is a kind of continuous power supply and Uninterruptible power supply equipment, when the computer is connected to the mains for normal use, a sudden power failure will cause a shutdown, while the UPS power supply can provide power instantly and keep the computer from shutting down.
