Method and device for determining the temperature of a semiconductor switch

摘要

The method involves switching-on a semiconductor switch (1) by increasing gate emitter voltage (Uge) of the switch, where a gate resistor terminal (GA) of the switch is connected to an external electrical resistor (Rext) via a resistor. Time duration (dt) required for increasing the gate emitter voltage of the switch from a voltage (U1) to another voltage (U2). Temperature (T) of the switch is determined based on the determined time duration. The switch is switched-off when the detected temperature reaches or exceeds a temperature threshold value (Tk). An independent claim is also included for a device for determining temperature of a semiconductor switch.