Offline UPS, also known as backup UPS, means that the inverter does not work when the mains is normal, and only starts to work when the mains is out of power and the battery is discharged. When the mains is normal, the mains is supplied to the electrical equipment through a simple voltage regulation filter output, and the battery is in a charged state. When there is a power failure, the inverter works to convert the DC power provided by the battery into a stable AC power output to the electrical equipment.
Offline UPS has the advantages of small size, high efficiency, low price and low operating cost. Since the inverter is in a non-working state under normal circumstances, the grid power is directly supplied to the load, so the power conversion efficiency of the offline UPS is very high.
But it also has the following disadvantages:
1. The load is not really isolated from the on-line power supply system.
2. The long transfer time and the lack of a true static switch means that the time required to transfer the load to the inverter is relatively long.
3. Although this conversion time is acceptable in some applications (such as a separate computer, etc.), this performance cannot meet the requirements of large or complex sensitive loads (such as large computer centers, telephone exchanges, etc.).
4. The output voltage cannot be adjusted.
Therefore, the offline UPS is mainly suitable for occasions where the fluctuation of the mains power is not large and the requirements for the quality of the power supply are not high. Its switching time is generally less than 10 milliseconds, so it is not suitable for use in places where critical power supply cannot be interrupted. However, in fact, the switching time is very short, and the switching power supply of a general computer or electrical equipment itself should be able to maintain about 10 milliseconds when the power is turned off. Generally, the electrical equipment will not have problems due to this switching time.In order to meet the needs of different customers, our company has launched a series of offline UPS, welcome to consult or place an order at our Alibaba store (https://soyan.en.alibaba.com/).
