BUS POWER DEVICE AND POWER SOURCE CONTROL METHOD

摘要

A bus power device includes a USB connector (150) connected to a high-power USB port (11) (or a low-power USB port (12)) of a USB-compatible device (10) corresponding to the USB interface standard, a current/voltage detector (107) for detecting current/voltage supplied to a bus power line (151) via the high-power USB port (11) (or the lower-power USB port (12)) and the USB connector (150) from the USB-compatible device (10), and a power assist unit (108) for assisting current to the bus power line (151) according to the comparison result between the current detection result in the current/voltage detector (107) and a current threshold value and assisting insufficient voltage to the bus power line (151) according to the comparison result between the voltage detection result and a voltage threshold value.