Patent ID: 7933694

Claim:
A power supply system mounted on a vehicle capable of running while switching between a first running mode of running using electric power stored for running without maintaining said electric power and a second running mode of running while maintaining said electric power at a prescribed target, comprising: a power line for supplying and receiving electric power between a drive force generation portion for generating drive force for running upon receiving electric power from the power supply system and the power supply system; first and second converters connected in parallel to said power line; a first rechargeable power storage device connected to said first converter; a plurality of second rechargeable power storage devices; a switching device provided between said plurality of second power storage devices and said second converter, configured to connect any one of said plurality of second power storage devices to said second converter in accordance with a provided instruction; and a control device for controlling said first and second converters and said switching device, and said control device including a switching control unit for generating said instruction for sequentially switching for use said plurality of second power storage devices such that, when a state quantity indicating a charged state of the second power storage device connected to said second converter is lower than a predetermined value, a remaining second power storage device of which state quantity is not lower than said predetermined value is connected to said second converter, and outputting said instruction to said switching device, a first electric power allocation ratio calculation unit for calculating, based on a remaining electric power amount of each of said first power storage device and said plurality of second power storage devices, a first electric power allocation ratio indicating a ratio of allocation of charge and discharge electric power between said first power storage device and the second power storage device connected to said second converter by means of said switching device, to be used during said first running mode, a second electric power allocation ratio calculation unit for calculating, based on a difference between said state quantity in each of said first power storage device and the second power storage device connected to said second converter by means of said switching device and a target value thereof, a second electric power allocation ratio indicating a ratio of allocation of charge and discharge electric power between said first power storage device and the second power storage device connected to said second converter, to be used during said second running mode, and a converter control unit for controlling said first and second converters in accordance with said first electric power allocation ratio during said first running mode and controlling said first and second converters in accordance with said second electric power allocation ratio during said second running mode.