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Low-power UPS power supply over-voltage protection is mainly through two solutions
by：Power Kingdom
2021-06-16
Low-power UPS power supplies have been widely used. Due to the small capacity of the low-power UPS power supply, in the process of use, in addition to considering the lightning protection, but also pay attention to the protection of overvoltage. At present, low-power UPS overvoltage protection mainly adopts two solutions.
The first solution is to increase the current capacity of the MOV. For example, select MOV devices such as 20D471, 25D471 and even 32D471 to increase the current capacity to 10kA***25KA (8/20μs, once) . In this way, it can not only withstand a long time or periodic over-voltage energy discharge, but also keep the residual voltage on the line at a low level. However, this will greatly increase the cost of protection (a tens of times increase). The first solution is to increase the operating voltage of the MOV. For example, use MOV devices such as 14D561 or 14D621 to increase the operating voltage from 470V to 560V or 620V. In this way, without changing the flow capacity, the MOV's action probability and energy-reduction time are greatly reduced without increasing the cost. However, this will increase the residual pressure on the line. These two are the current two effective solutions for overvoltage protection of low-power UPS power supplies. In addition, users also need to pay attention to the fact that a reasonable power supply overvoltage protection program can withstand long-term or periodic overvoltage energy discharge, but also It can keep the residual pressure on the line at a low level. This is what everyone needs to understand and face.Custom message
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