Patent ID: 8035252

Claim:
A power supply system capable of supplying an electric power to a load device, comprising: first and second chargeable power storage devices; a power line configured to transfer electric power between the power supply system and said load device; a first converter provided between said first chargeable power storage device and said power line, the first converter performs voltage conversion between said first chargeable power storage device and said power line; a second converter provided between said second chargeable power storage device and said power line, the second converter performs voltage conversion between said second chargeable power storage device and said power line; and a control device that controls said first and second converters, wherein said control device determines (1) a maximum electric power transferable between said first and second chargeable power storage devices via said power line and (2) a transfer direction of the electric power based on an allowable discharge power and an allowable charge power of each of said first and second chargeable power storage devices, and the control device controls said first and second converters to transfer the determined maximum electric power between said first and second chargeable power storage devices.