In control systems operating with AC voltage, AC UPS is the most suitable. The offline or standby topology structure is very simple and clear. These products are inexpensive, so they are the most common type of AC UPS. Under normal circumstances, offline UPS transfers the main power from the input terminal to the output terminal, without any other interaction except for charging the battery connected in parallel with the main power circuit. If the main power supply fails, the UPS will switch from the main power circuit to the battery circuit. The transition time from UPS losing main power to battery power cannot exceed 10ms. A 10ms switch usually does not affect downstream equipment, but can protect systems sensitive to voltage fluctuations.
Kuna seti ndogo mbili za UPS za mawasiliano: vifaa vilivyoboreshwa (analogi) vya kutoa mawimbi ya sine na vifaa safi vya kutoa mawimbi ya sine. Kila aina ya pato la mawasiliano ni tofauti.
Kifaa cha mawimbi ya sine kilichoboreshwa hupata volti kutoka kwa kifurushi cha betri na kuunda matokeo ya muundo wa mawimbi sawa na mawimbi ya sine kwa njia rahisi iwezekanavyo. Ingawa aina hii ya UPS ina gharama ya chini, pia kuna shida kadhaa. Hatua muhimu katika voltage inaweza kuharibu mzunguko wa pembejeo wa vifaa vya chini vya mto. Hatua hizi kubwa pia zinaweza kusababisha idadi kubwa ya mabadiliko ya muda katika matokeo ya UPS. Hii inaweza kusababisha kushindwa mapema kwa moduli ndogo za PC na PLC za nguvu.
UPS safi ya wimbi la sine itatoa pato la mawimbi ya sine ambayo ni sawa na muundo wa mawimbi unaolishwa na usambazaji mkuu wa nguvu wa 120/230V. Pure sine wave UPS ni chaguo bora kwa vifaa nyeti vya udhibiti kama vile vidhibiti vya mantiki vinavyoweza kupangwa (PLCs), mifumo ya udhibiti iliyosambazwa (DCS), na Kompyuta za viwandani (IPC). Ingawa saketi zaidi zinahitajika, vifaa vya kudhibiti vinavyoendeshwa na UPS vina muda mrefu wa kuishi, na hivyo kupunguza gharama ya jumla ya umiliki.
Critical task applications require more advanced UPS, namely dual conversion or online UPS. This UPS will never be in standby mode. The battery circuit is actively connected to the system. If the main power supply is interrupted, there will be no interruption or voltage drop in the output, thus achieving seamless operation of the battery. The online system has built-in filtering and regulating devices. During normal operation, it converts the input power from AC to DC, and then converts it back to AC through an inverter.