Patent ID: 6215272
Filing Date: 2001-04-10
Classification: H01M,H02J,Y02E

Abstract:
A fuel cell device, comprising:a main body of a fuel cell,a DC-DC converter or a DC-AC converter for converting direct current power into direct current power of a predetermined voltage V 1 or an alternating current power thereof so as to output said direct or alternating current power, said direct current power being outputted from said main body of the fuel cell,an output terminal to an external load,an auxiliary device necessary for driving said fuel cell device,a secondary battery that, when said output from said main body of the fuel cell is lacking, generates an output voltage V 2 for driving said auxiliary device, said auxiliary device being necessary for driving said fuel cell device,a charge controlling unit for controlling charge of said secondary battery, anda circuit-switching controlling unit for controlling supply of said output power from said DC-DC converter or said DC-AC converter to said output terminal to said external load, said auxiliary device and said charge controlling unit, and for controlling supply of said output power from said secondary battery, said auxiliary device being necessary for driving said fuel cell device, wherein the relation between said output voltage V 1 from said DC-DC converter or said DC-AC converter and said secondary battery output voltage V 2 is so set as to satisfy V 1>V 2, and when said output voltage V from said main body of the fuel cell becomes lower than a predetermined voltage V 3 at the time of a sudden change of said external load, said output to said charge controlling unit is stopped, and when said output voltage V from said main body of the fuel cell is lowered even further and becomes lower than a predetermined voltage V 4, said output to said auxiliary device is switched from said output from said DC-DC converter or said DC-AC converter to said output from said secondary battery, said auxiliary device being necessary for driving said fuel cell device.