Tags: Q: What is a backup UPS power supply? Answer: The backup UPS power supply is also called non-online UPS power supply. The biggest difference between it and the online UPS is its working state when the mains power is normal. The backup UPS is usually in the battery charging state when the mains power is normal. In the event of a power failure, the inverter switches to the working state in an emergency, and converts the DC power provided by the battery into a stable AC output. Therefore, the backup UPS is also called offline UPS. . The advantages of backup UPS power supply are: high operating efficiency, low noise, and relatively cheap price. It is mainly suitable for occasions where the mains power fluctuation is not large and the power supply quality is not high, and it is more suitable for home use. However, this kind of UPS has a switching time problem, so it is not suitable for use in critical places where the power supply cannot be interrupted. But in fact this switching time is very short, generally between 2 to 10 milliseconds, and the computer's own switching power supply should be able to maintain about 10 milliseconds when the power is off, so personal computer systems generally do not appear due to this switching time. problem. Small backup UPS generally can only continue to supply power for a few minutes to tens of minutes, mainly to allow you time to back up data and finish the work at hand as soon as possible, and its price is also low. For non-critical computer applications, such as personal home users, a low-power backup UPS can be equipped. But some can still determine the power supply time due to the capacity of the battery.