BUS POWER DEVICE AND POWER SOURCE CONTROL METHOD

摘要

To include a USB connector (150) that is connected to a high-power USB port (11) (or a low-power USB port (12)) of a USB-corresponding device (10) corresponding to a USB interface standard, a current/voltage detecting unit (107) that detects current/voltage supplied from the USB-corresponding device (10) to a bus power line (151) via the high-power USB port (11) (or the low-power USB port (12)) and the USB connector (150), and a power assisting unit (108) that assists a current to the bus power line (151) based on a result of comparison between a current detected by the current/voltage detecting unit (107) and a threshold current, and assists a voltage as much as the deficient amount to the bus power line (151) based on a result of comparison between a detected voltage and a threshold voltage. <IMAGE>