| 摘要 |
A power supply apparatus with a back-up power unit includes: a plurality of AC-DC conversion units each connected in parallel to a commercial AC power source, and each converting an AC voltage of said power source to a high DC voltage; a plurality of DC-DC conversion units each connected to an output of each AC-DC conversion unit, each converting the high DC voltage to a low DC voltage to be supplied to a load, and each output thereof connected in parallel to said load; and a back-up power unit connected in parallel to the output of each AC-DC conversion unit through a first and second diodes in order to supply the high DC voltage to the DC-DC conversion unit when a failure occurs in the AC power source.
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