In the use of UPS
power supply, the overvoltage of the cost and its components are related to the service life of UPS power supply, such as over-voltage protection scheme plays an important role, in general, small capacity UPS main is not considered lightning protection, but the power of over-voltage protection.
There are two kinds of small capacity of UPS power supply overvoltage protection scheme, one option is to increase flow capacity of MOV, such as choosing 20 d471, 25 d471 even 32 d471 MOV devices, make the flow capacity of up to 10 ka to 25 ka (
The left and right sides.
In this way, both to endure a long time or periodically overvoltage discharge energy, will also be able to make online residual pressure in a low level.
However, this will make protection cost greatly increase (
The increase of dozens of times)
The second solution is to increase the action of MOV voltage, such as choose 14 d561 or 14 d621 MOV devices, make the action of the voltage from 470 v to 560 v or 620 v.
So, under the condition of the flow capacity does not change, can greatly reduce the MOV action probability and xie time, without increasing costs.
However, it makes online residual pressure increased.
Reasonable power overvoltage protection scheme is able to endure longer or periodic overvoltage discharge energy, will also be able to make online residual pressure in a low level.
So we must choose good overvoltage protection scheme for himself.
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