| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a power supply device which stably supplies an electric power by receiving the electric power after checking whether or not an interface part is able to supply electric power. SOLUTION: The device has a voltage detecting means 11 which inputs an electric power P and other electric powers A and B independently and measures their voltages, a power source selecting means 12 which selects electric power which can be supplied to a load out of those electric powers and supplies the electric power to the load, and a load varying means 50 which judges the load supply capability of the electric power P from a voltage drop caused by placing a specific load on the electric power P in advance and at the time of power feeding from the electric power P, the power source selecting means 12 selects the electric power P when the load varying means 50 judges that there is the load supply capability.</p> |
