Priority is claimed on Japanese Patent Application No. 2006-146882, filed May 26, 2006, the contents of which are incorporated herein by reference.
1. Field of the Invention
The present invention relate to a power supply system of a fuel cell vehicle.
2. Description of the Related Art
A conventional power supply system of a fuel cell vehicle is known which increases the output voltage of a fuel cell using a first DC-DC converter and input it to a load, wherein if the output electrical power from the fuel cell is insufficient for the requirement by the load, then the deficiency is compensated by inputting additional electrical power to the load from a power storage device via a second DC-DC converter, while if the output electrical power from the fuel cell is excessive for the requirement by the load, then the excessive electrical power is supplied from the fuel cell to the power storage device via the first DC-DC converter and the second DC-DC converter, to charge the power storage device (for example, refer to Japanese Unexamined Patent Application, First Publication No. 2003-208913).
The power supply system of a fuel cell vehicle having the above-mentioned construction needs cooperative operations of the two DC-DC converters to supply stable current and voltage to the load; and it has been an object to establish a control method therefore.
The present invention was made in view of the above-mentioned circumstances and has an object of providing a power supply system of a fuel cell vehicle which enables a cooperative control of two DC-DC converters to supply stable current and voltage to a load.