Patent ID: 9153984
Filing Date: 2015-10-06
Classification: G01R,H01M,H02J,Y02E

Abstract:
1. A charging device which charges a portable device via a universal serial bus, the charging device comprising: a power supply unit which supplies current to a portable device coupled through a voltage bus (VBUS); a plurality of available power indicating circuits which notify, through a data line, a portable device coupled to the charging device of a signal indicating suppliable amount of current; a control unit which obtains, from a portable device coupled thereto at a time of adjustment, information identifying the portable device; a storage unit which stores, for a plurality of portable devices, a table defining correspondence between information identifying the portable devices and available power indicating circuits, and a measurement unit which measures amount of current supplied to the portable device through the voltage bus (VBUS), wherein the control unit selects, referring to the table based on the obtained information, an available power indicating circuit, and activates only the selected available power indicating circuit at a time of actual operation; and wherein, when the control unit does not obtain, from a portable device coupled thereto, information identifying the portable device, or when an available power indicating circuit corresponding to information is not defined in the obtained table, the control unit activates the available power indicating circuits one by one, causes the measurement unit to measure amount of current supplied to the portable device through a voltage bus (VBUS) and stores a measurement result in the storage unit, selects an available power indicating circuit exhibiting the maximum current supply amount, referring to the storage unit, and activates only the selected available power indicating circuit at a time of actual operation.