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2. 3 Operating Principle
Figure 2-4 The UPS operating principle
1. Input filter: it filters the input and provides clean AC power to the UPS.
2. AC/DC converter: In Normal mode, it converts the AC input power to
regulated DC power, and raises the regulated DC voltage for DC/AC
converter.
3. DC/DC converter: Raises the DC Voltage from the battery system to the
optimum operating voltage for the inverter when the UPS operates in
Battery mode.
4. DC/AC inverter: In Normal mode, it utilizes the DC output of the
AC/DC converter and inverts it into precise, regulated sine wave AC
power. In Battery mode, it receives energy from the battery through the
DC/DC converter.
2 Product Description
5. Bypass: It is very important in the UPS system. In the event of a UPS
fault that will not lead to UPS shutdown, the load will be automatically
transferred to the bypass. Meanwhile, the LED indicators will indicate
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the fault type, and the fault information will be reported through the
communication ports.
6. Charger: The charger of standard UPS provides 1A charging current; and
long backup time provided 7A charging current.
7. Battery: Sealed maintenance-free lead –acid battery can be used as the
DC source of the UPS.
8. Output filter: It filters the output and provides clean AC power to the
load.
