A method of operation of power semiconductors

The invention relates to a process for preheating of power semiconductors (1), which are arranged (2) of the inverter (3) in converters (3), in particular a DC voltage intermediate circuit, wherein a temperature (T) of at least one of the power semiconductors (1) by means of a temperature detector (5) is detected by a temperature comparison (V Furthermore, a computing unit (7) for performing the method is provided as well as a driving device (10) which is designed to execute with the computing unit (7) the process. Also provided are the inverter (3) with a DC intermediate circuit (2), wherein the power semiconductor (1), the computing unit (7) and the control device (10), as well as an electric or hybrid vehicle (13) having a from the inverter (3) operated electrical machine (4), in particular an asynchronous machine (AM), or a synchronous machine (SM).