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Tianjin UPS Uninterruptible Power Supply Quotation, Tianjin UPS Uninterruptible Power Supply Phone, Tianjin UPS Uninterruptible Power Supply Wholesale Working Principle: Audio, System Composition, Figures 1 and 2 Figure 1 and Figure 2 show typical UPS system block diagrams, with the basic structure consisting of a rectifier and charger that converts AC to DC, and an inverter that converts DC back to AC. Batteries store energy and maintain a normal charging voltage when AC power is normal. In case of a power outage, the battery immediately supplies power to the inverter to ensure the UPS's AC output voltage. The following simplified diagrams illustrate various working conditions of UPS systems (taking online UPS power supplies as an example). (1) When the city power is supplied normally within the UPS's allowed range, as shown in Figure 2, the thick lines depict the flow of power energy. [3] (2) In case of a main power failure, where the city power is cut off, the power supply instantly switches to being provided by the inverter, as shown in Figure 3. [3] (3) When the load is too heavy or the inverter within the power supply fails, the UPS will switch to an auxiliary route to be powered directly by the main power supply, as shown in Figure 4.