Power supply control device and a power supply control method

PROBLEM TO BE SOLVED: To provide a power supply controller reducing power losses and noise generated by a step-up/down chopper. SOLUTION: The power supply controller (10) includes: a charge/discharge controller (11) which has a step-up/down chopper that carries out voltage conversion through switching operation by a plurality of switching elements and controls charging/discharging of a storage battery (20); and a bypass circuit (12) which is connected in parallel with the charge/discharge controller (11), and forms a bypass route for charging/discharging the storage battery by bypassing the charge/discharge control means when turned on or disconnecting the bypass route when turned off. COPYRIGHT: (C)2010,JPO&INPIT