METHOD AND CHARGE-UP CIRCUIT CAPABLE OF ADJUSTING CHARGE-UP CURRENT

摘要

A charge-up circuit includes a charge-up transistor configured to supply a charge-up current to a secondary battery in accordance with a control signal, a detection resistor connected in series with the charge-up transistor to detect the charge-up current, a current-to-voltage conversion circuit configured to generate and output a monitor voltage in accordance with the charge-up current based on each voltage at both end terminals of the detection resistor, a reference voltage generator configured to generate a predetermined reference voltage and including a voltage adjusting mechanism to generate the reference voltage from the constant voltage so that the charge-up current becomes a desired current, and a charge-up current control circuit configured to control the charge-up transistor so that the monitor voltage becomes the reference voltage.