| 摘要 |
In order to provide a power supply control circuit having a low charging loss and low leak electric current regardless of the type of power supply apparatus to allow the charging efficiency to be improved in an electronic apparatus that has a power supply apparatus or a charging device, and the length of time that the system can operate to be extended, there is provided a power supply control circuit (10) interposed between a power supply apparatus (11) and a storage device (12) that stores power supplied by the power supply apparatus (11), wherein the circuit has a charging current detector (13) for detecting the charging current IC flowing from the power supply apparatus (11) to the storage device (12); a blocking unit (15) for cutting off the backflow current (IR) that flows from the storage device to the power supply apparatus, on the basis of an inputted blocking control signal (SH); and a backflow monitoring unit (14) for monitoring by sampling for the presence of the charging current (IC) until the charging current (IC) is detected, constantly monitoring for the presence of the charging current (IC) after the charging current (IC) has been detected, and outputting a blocking control signal (SH) for cutting off the backflow current (IR) when the charging current (IC) is not flowing. |
