| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply device that can be switched to an input AC voltage without any uninterruptible disconnection, can avoid an inverse power flow, and can cope with the connection of an inductive load or a capacitative one, and to provide a power supply system. <P>SOLUTION: The uninterruptible power supply device or a power supply system comprises: first and second switching elements used as the current path between the I/O terminals of the input AC voltage, and as an inverse power flow prevention means; first and second rectifying elements; a power supply output means for outputting voltage having a waveform similar to a full-wave rectification waveform of the input AC voltage when the input AC voltage drops; third to sixth switching elements that are turned on or off to convert the waveform of current flowing from the output voltage of the power supply output means to the waveform of the input AC voltage; and a ninth switching element subjected to forward biasing for continuity when the load voltage increases while the inductive load, or the like is connected to suppress an increase in a load voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT |
