| 摘要 |
An uninterruptible power supply includes an input switching circuit, an AC-to-DC converting circuit, a bus capacitor, an energy storage unit, a charging circuit, a DC-to-DC converting circuit, and a system control circuit. The input switching circuit receives an input AC voltage. The AC-to-DC converting circuit is used for converting the input AC voltage into a bus voltage. The energy storage unit is used for storing electric energy. The charging circuit is used for charging the energy storage unit. The DC-to-DC converting circuit is used for converting the energy storage unit connecting node voltage into a regulated DC voltage. The system control circuit is used for controlling operations of the uninterruptible power supply. When the uninterruptible power supply is initiated, the AC-to-DC converting circuit is disabled and the bus capacitor is charged by the DC-to-DC converting circuit under control of the system control circuit.
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