Patent ID: 7638975
Filing Date: 2009-12-29
Classification: H01L,H02H,H02J,Y02E

Abstract:
1. A power supply control circuit interposed between a power supply apparatus and a storage device that stores power supplied by the power supply apparatus, the power supply control circuit controlling electric current that flows between the power supply apparatus and the storage device, the power supply control circuit comprising: a charging current detector being configured to detect the charging current flowing from the power supply apparatus to the storage device; a blocking unit being configured to cut off the backflow current flowing from the storage device to the power supply apparatus on the basis of an inputted blocking control signal; and a backflow monitoring unit having a comparator being configured to compare voltage on both ends of the charging current detector, the backflow monitoring unit being configured to monitor the presence of the charging current by sampling by the comparator, until the charging current is detected, the back flow monitoring unit being configured to monitor constantly the presence of the charging current by the comparator after the charging current has been detected, the back flow monitoring unit being configured to output a blocking control signal to cut off the backflow current when the charging current is not flowing.