| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device with a built-in battery, which can easily construct a circuit system for switching from charging to a mobile terminal connected to the outside into charging to an incorporated battery unit.SOLUTION: This power supply device with the built-in battery includes an AC-DC conversion circuit 101, a chargeable battery unit 103, and a DC-DC conversion circuit 105. In the power supply device, power is supplied from the AC-DC conversion circuit 101 to an external mobile terminal 107, an output voltage determining circuit 109 detects an increase in an output voltage of the AC-DC conversion circuit 101 when switching from CC charging to CV control. Thus, charging can be easily switched from power supply to the external mobile terminal 107 to the built-in battery unit 103. |
