| 摘要 |
PROBLEM TO BE SOLVED: To drive a plurality of loads, which are different in operation voltage due to batteries, in low loss. SOLUTION: A power circuit includes a step-up circuit 2, which boosts the voltage of a battery, a load, which includes first loads 3 and 4 and a second load 9 requiring a voltage lower than those of the first loads 3 and 4, the first path 101, which supplies a voltage after boosting to the side of a load via the step-up circuit 2, the second path 102, which supplies the battery voltage to the load side without the step-up circuit 2, a step-down means 8, which steps down the voltage supplied to the load side to a voltage required in the second load 9, and a switching means 7, which switches the path into the second path 102 in case that the battery voltage is higher than the voltage required in the first loads 3 and 4, while the first loads 3 and 4 are operating, and switches it into the first path 101 in case that the battery voltage is lower than the voltage required in the first loads 3 and 4. COPYRIGHT: (C)2009,JPO&INPIT
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