Electrothermal model of a fuse

Nowadays, power electronic applications operate with very high frequency. Fuses used for the protection of semiconductors may be affected by such high frequency. Thus, fuses have to be derated according to frequency and distance from the return conductor. Here, an electrothermal model of a fuse is proposed. From this model, current and temperature distribution can be calculated. Derating characteristics can then be obtained in order to prevent unexpected melting or thermal ageing.