| 摘要 |
A portable computer having a first battery pack and a second battery pack supplying electric power, and a system power supply supplying the electric power from either of the first battery pack or the second battery pack as system driving power, includes a first switching part allowing the electric power from the first battery pack to the system power supply to be supplied and broken, a first switching control circuit part turning on/off the first switching part to supply and break the electric power for the system power supply, a battery sensor sensing whether or not the second battery pack supplies the electric power to the system power supply; and a battery state output circuit controlling the first switching control circuit part to turn off the first switching part when the battery sensor determines that the second battery pack supplies the electric power to the system power supply.
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