DIRECT-CURRENT POWER SUPPLY DEVICE AND METHOD FOR SHUTTING DOWN A FUEL CELL BLOCK

摘要

The invention relates to a direct-current power supply device (1, 21, 41), which comprises a fuel cell block (3, 23, 43) and a protective device (5, 25), and to a method for shutting down a fuel cell block (3, 23, 43). If, after operation, a fuel cell block (3, 23, 43) is disconnected from an electrical consumer (9, 29, 49) or from a direct current network (7, 27, 47), a problem arises in that remainders of fuel gases are still present in the fuel cell block. These fuel gases have to be removed from the fuel cell block (3, 23, 43). In order to solve for this problem, the invention provides that an electrical resistor (11, 31, 51) is connected in parallel to the fuel cell block (3, 23, 43). When shutting down the fuel cell block (3, 23, 43), a current flow from the fuel cell block (3, 23, 43) is maintained by the electrical resistor (11, 31, 51), whereby the remaining fuel gases inside the fuel cell block (3, 23, 43) are completely consumed.