Temperature monitoring of power switches

A power electronic temperature sensing switch arrangement including a power converter (9) for electric drives or power rectifiers with a group of two or more semi-conductor electronic power switches coupled with or arranged on a common cooling body (1), and with a calculator (8) suitable for implementing and executing a temperature model for each of the electronic power switches (S1-S6), the electronic temperature emitting power switch arrangement also including interfaces for receiving signals representing switching and operating parameters as well as temperature measurement values in order to calculate the temperature or a temperature difference within electronic power switches (S1-S6) by means of the temperature model, wherein an electric current flowing through the electronic power switches (S1 - S6), an electric voltage applied to one or more electronic power switches (S1 - S6), a switching frequency or interval of the electronic power switches or thermic resistances or capacities of the electronic power switches (S1-S6) or the cooling body (1) are used as an input parameter for the temperature model(s) and the power switch arrangement using semiconductor electronic power switches wherein values for losses of one or more of the electronic power switches are processed by means of the temperature model characterised by at least one temperature sensor having an output coupled with the calculator (8), each temperature sensor being allocated to a subgroup of at least two of said electronic power switches, each temperature sensor (Thu, Thv, Thw) being centrally positioned in the middle between the electronic power switches of the subgroup to which the temperature sensor is allocated and connected in a heat transmitting way with the cooling body (1), wherein the number of allocated temperature sensors does not exceed half the number of electronic power switches in the group.