FUEL CELL SYSTEM AND METHOD FOR CONTROLLING A HEATING CURRENT FOR TEMPERATURE CONTROL OF A FUEL CELL STACK OF A FUEL CELL SYSTEM

The invention relates to a fuel cell system (), wherein the fuel cell system () comprises a fuel cell stack () for generating an output voltage and a boost converter () for increasing the output voltage of the fuel cell stack (), having at least one converter unit (, , , ), wherein the converter unit (, , , ) comprises a coil () and a controllable switch () for increasing the output voltage of the fuel cell stack (), wherein the controllable switch () comprises a variable resistor. Furthermore, the fuel cell system () comprises a control apparatus (), wherein the control apparatus is configured so as to control the controllable switch () of the at least one converter unit (, , , ) in such a way that the resistor of the controllable switch () of the at least one converter unit (, , , ) is adjusted for controlling a heating current for temperature control of the fuel cell stack ().