Patent ID: 7049788

Claim:
A power source device supplying power to an electric motor and an accessory circuit, comprising: a fuel cell power plant having an output terminal to which the electric motor and the accessory circuit are connected in parallel; a power storage device connected to the output terminal, the power storage device performing a charging operation and a discharging operation; and a DC/DC converter which regulates an input voltage of the power storage device in a charging operation and an output voltage of the power storage device in a discharging operation, the DC/DC converter being disposed between the power storage device and the terminal; wherein: the accessory circuit is connected to the output terminal not via the DC/DC converter, and the accessory circuit comprises: a first circuit and a second circuit, wherein the first circuit consumes more power than the second circuit, and a length of wire connecting the first circuit and the terminal is shorter than a length of wire connecting the second circuit and the terminal.