The overvoltage protection of low-power UPS power supply is mainly achieved through two solutions

Low power UPS power supply has been widely used. Due to the small capacity of low-power UPS power supply, in addition to lightning protection, attention should also be paid to overvoltage protection during use. At present, there are two main solutions for overvoltage protection of low-power UPS.

Low power UPS power supply has been widely used. Due to the small capacity of low-power UPS power supply, in addition to lightning protection, attention should also be paid to overvoltage protection during use. At present, there are two main solutions for overvoltage protection of low-power UPS.

The first solution is to increase the flow capacity of MOVs, such as selecting different specifications of MOV devices, which can increase the flow capacity to 10kA-25KA (8/20 μ s. About once. In this way, it can not only withstand long-term or periodic overvoltage energy discharge, but also maintain a low level of residual voltage on the line. However, this will significantly increase the cost of protection (by tens of times).

The second solution is to increase the operating voltage of the MOV, such as selecting different specifications of MOV devices to increase the operating voltage from 470V to 560V or 620V. In this way, without changing the flow capacity, the probability of MOV action and energy release time are greatly reduced without increasing costs. However, this will increase the residual voltage on the line.

These two are currently two effective solutions for overvoltage protection of low-power UPS power supplies. In addition, users need to pay attention to a reasonable power overvoltage protection scheme that can withstand long-term or periodic overvoltage energy discharge, and can also maintain a low level of residual voltage on the line. This is also something that everyone needs to understand and face.