| 摘要 |
<p>A power supply unit is provided to implement a simple control circuit, and reduce a production cost by switching an output operation of a power selection unit. A power supply unit includes a power selection unit(120), a system unit(110), and a control unit(130). The power selection unit is connected to the system unit. The power selection unit selects and outputs one of a plurality of powers to the system unit. The control unit is installed on a power supply path between the power selection unit and the system unit. The control unit controls the power selection unit so that the power selected by the power selection unit is intermittently outputted to the system unit in response to a power switching signal which is applied from an external. The powers include an adapter power and a battery power. The power selection unit selects one having a larger input voltage from the adapter power and the battery power.</p> |
