Semiconductor Diode Model with Thermal Behavior for a DC Current Limiting Device

The problem of large short-circuit currents is typical for short, autonomous power systems. This current must be limited for a long time, but not switch-off, because automatic circuit breakers should switch the system to emergency power circuits. To solve this problem, a semiconductor current-limiting device based on a DC-DC converter (chopper) is proposed in the paper. For such a device, it is necessary to consider in detail the thermal behavior of the semiconductor device parameters, in particular a diode. Detailed modeling of the thermal behavior of the volt-ampere characteristics will help optimize the semiconductor assembly, as well as simulate the operation of the current limiting device in more detail. The article demonstrates a detailed thermal model of a semiconductor diode for MATLAB Simulink. An algorithm for selecting the parameters of this model is proposed. The operation of this model as part of a current limiting device is shown.