| 摘要 |
PROBLEM TO BE SOLVED: To provide a power unit which can generate specified voltage, receiving current supply from two or more power circuits. SOLUTION: This power unit is equipped with the first power voltage terminal (Va) and the second power voltage terminal (Vb), a DC/DC converter circuit 10 which converts inputted power voltage into an AC signal Vsw and then, converts it into DC voltage prior to output, and switching circuits 30 and 40 which switch the power voltage to be inputted into the DC/DC converter circuit 10 into either the first power voltage Va or the second power voltage Vb. The power unit is constituted to switch the switching circuits 30 and 40, on the basis of the AC signal Vsw of the DC-DC converter circuit 10. COPYRIGHT: (C)2006,JPO&NCIPI
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