[EL] 問﹕Uninterruptible Power Supply UPS 可以分為幾多種？

答﹕

1. Offline / Standby, 供電嗰陣一頭叉住舊電，一頭比電，到冇市電嗰陣就轉用電池


2. Line Interactive, 類似 Offline / Standby, 當大既Voltage轉變時用電池；轉變唔大嗰陣就用隻Autotransformer嚟調電壓，咁舊電既損耗就冇咁大。


3. Online / Double Conversion, 由市電入嚟開始已經唔係直接比A.C., 而係先變直流再兵分兩路，一路比Equipment, 一路差住舊電。即係响供電期間UPS係全程介入，保障上係最好。

* Rectifier係由AC轉DC; Inverter係由DC轉AC;


仲有種係Data Center 會用既Flywheel形式，又叫Dynamic UPS，Wiki話係Online式嚟，見 https://elvissharing.blogspot.com/2020/04/ac-el-fs-data-center-design.html

(Source: Wikipedia)