| 摘要 |
PROBLEM TO BE SOLVED: To reduce cost and power consumption.SOLUTION: A power feeding system according to an embodiment comprises a USB connector 8. A power feeding operation is performed from a power supply circuit 5 via the USB connector 8. A power feeding device 1 comprises: a first power supply line VBUS for the power supply circuit 5 that outputs a plurality of power supply voltages; a plurality of voltage regulator diodes T1, T2, and T3 that have breakdown voltages corresponding to the plurality of power supply voltages, respectively; and a control circuit 6 that selects one power supply voltage from the plurality of power supply voltages as a power supply voltage outputted from the power supply circuit 5, and selects from the plurality of voltage regulator diodes T1, T2, and T3 a voltage regulator diode to be connected with the first power supply line VBUS depending on the selected power supply voltage.SELECTED DRAWING: Figure 2 |
