| 摘要 |
PURPOSE: An offline uninterruptible power supply for saving energy is provided to minimize the no-load loss and reduce the transfer time by using an auxiliary power supply device. CONSTITUTION: An offline uninterruptible power supply for saving energy includes a rectification part, a charge portion(110), a battery(B), an inverter portion(140), an input power sensor(190), an output power sensor(200), a battery state sensor(210), an auxiliary power converter portion(120), a control portion(130), an input power switch(160), an output power switch(170), a PLL circuit(180), a transformer(150), and a filter portion(220). The rectification part converts AC power to DC power and the charge portion charges the battery(B). The battery(B) is charged by the power of the charge portion(110). The inverter portion(140) inverts the DC power of the battery(B) to the AC power. The input power sensor(190) is used for sensing the input power. The output power sensor(200) is used for sensing the output power. The battery state sensor(210) is used for sensing a state of the battery(B). The auxiliary power converter portion(120) supplies the power to each element. The control portion(130) receives output signals of each sensor and controls the offline uninterruptible power supply. The input power switch(160) is used for selecting the power of the rectification part or the power of the auxiliary power converter portion(120). The output power switch(170) is used for selecting the commercial power or the power of the inverter portion(140). The PLL circuit(180) is used for synchronizing the commercial power with the output power. The transformer(150) is used for boosting the supply voltage. The filter portion(220) is installed at a front end of the load.
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