| 摘要 |
PROBLEM TO BE SOLVED: To provide a set current value switch circuit for constant-current charging that is capable of controlling switching of charging current with accuracy. SOLUTION: A charging current lout that is outputted from a constant-current control circuit to an object to be charged at constant current, is detected. Charging current control signals S2 corresponding to a large number of switchable set current values are outputted to the constant-current control circuit to control the charging current lout to a preset current value. The large number the set current values are divided into an even number of stages on a magnitude basis, and amplifier circuits 30a-30b for charging current detection having amplifying characteristics corresponding to these stages of the set current values, respectively, are provided. These amplifier circuits output the charging current control signals S2 corresponding to the set current values according to the detected charging current Iout. The set current values are divided into relatively small values for steady charging mode and large values for quick charging mode, so that the switching of charging current will be controlled between steady charging mode and quick charging mode. |
