UPS5000-A-30 kVA & 40 kVA & 80 kVA
User Manual
Copyright © Huawei Technologies Co., Ltd.
Figure 2-2 UPS conceptual diagram
2.2.2 Working Modes
2.2.2.1 Normal Mode
When the UPS works in normal mode, the rectifier converts the AC input voltage into the DC
voltage, which is then raised to the bus voltage by the power factor correction (PFC) circuit.
Then one part of the voltage passes through the DC-DC circuit to charge the battery string,
and the other part is converted by the inverter into AC voltage outputs. The two conversions
ensure high-precision and high-quality output voltages, protecting loads from interferences
such as input harmonics, burrs, and voltage transients. Figure 2-3 shows the conceptual
diagram of the UPS working in normal mode.
Figure 2-3 UPS conceptual diagram in normal mode
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