Patent ID: 8810061

Claim:
A vehicular power supply apparatus, comprising: a main power storage device for storing electric power for traveling; a power storage device for auxiliary machinery for storing electric power for auxiliary machinery; a charger configured to receive electric power from a power supply external to a vehicle and charge said main power storage device and said power storage device for auxiliary machinery; and a control device for controlling said charger, wherein said charger includes a capacitor for smoothing charging power outputted to said main power storage device, said control device includes: a charging control unit for controlling charging of said power storage device for auxiliary machinery by said charger such that said power storage device for auxiliary machinery can receive residual electric charge in said capacitor; and a discharging control unit for controlling said charger, after the end of charging of said main power storage device by said charger, such that the residual electric charge in said capacitor is discharged into said power storage device for auxiliary machinery, said charging control unit controls charging of said power storage device for auxiliary machinery such that remaining capacity of said power storage device for auxiliary machinery does not exceed a prescribed amount, said prescribed amount is determined based on an amount of electric power stored in said capacitor, said charger further includes: a main circuit for converting a voltage of electric power supplied from said power supply and outputting the electric power to said main power storage device; and a sub power supply unit for converting a voltage of the electric power outputted from said main circuit and outputting the electric power to said power storage device for auxiliary machinery, said charging control unit controls charging of said power storage device for auxiliary machinery by said sub power supply unit such that said power storage device for auxiliary machinery can receive the residual electric charge in said capacitor, and said discharging control unit controls said sub power supply unit, after the end of charging of said main power storage device, such that the residual electric charge in said capacitor is discharged into said power storage device for auxiliary machinery.