Patent ID: 8787050

Claim:
A circuit connection control system of a fuel cell having a plurality of unit cells, the circuit connection control system comprising: a point connection portion to which an anode current collecting portion and a cathode current collecting portion of each unit cell are electrically connected; a voltage measuring unit that measures an output voltage of each unit cell; a switching unit connecting the anode current collecting portions and the cathode current collecting portions of the plurality of unit cells at the point connection portion; and a DC-DC converter that converts a voltage generated from the fuel cell to a predetermined voltage, wherein the switching unit includes: a plurality of main switches, one main switch being installed at an inlet end of each unit cell, the main switches being equal in number to the unit cells; a plurality of series connecting switches, each series connecting switch connecting an outlet end of one unit cell of the plurality of unit cells and an inlet end of another unit cell of the plurality of unit cells, one of the main switches being between each series connecting switch and the inlet end of the another unit cell, the series connecting switches being one less in number than the unit cells; a plurality of by-pass switches that each connect an inlet end of one unit cell of the plurality of unit cells and an inlet end of another unit cell of the plurality of unit cells, one of the main switches being between each by-pass switch and the inlet end of the another unit cell, the by-pass switches being equal in number to the unit cells; and a plurality of parallel connecting switches that each connect an outlet end of one unit cell of the plurality of unit cells and an outlet end of another unit cell of the plurality of unit cells, the parallel switches being one less in number than the unit cells.