Patent attributes
A power supply system includes: a first electrical storage device; a charging device charging the first electrical storage device with external power from an external power supply; a second electrical storage device supplying an auxiliary load with a voltage lower than an output voltage of the first electrical storage device; a first converter stepping down a voltage of power from the first electrical storage device and supplying the auxiliary load and the second electrical storage device with a voltage; a second converter having a capacity smaller than that of the first converter and charging the second electrical storage device with the external power; and a controller, when the external power is charged, controlling charging power from the charging device to the first electrical storage device and charging power from the second converter to the second electrical storage device based on a state of charge of the second electrical storage device.
