Modeling of fuses for melting time and fusing current analysis

This paper describes a new model that can calculate the melting time and fuse current of fuses from only the catalog value of joule-integral provided by the maker. The calculated value in the fuse is compared with the catalog value, so the circuit is open when these two values are equal. Two features allow us to obtain the value of joule-integral in a fuse easily and accurately for various circuits. One is a method for detecting the current in the fuse at any given time, so that the fuse current can be calculated accurately. The other is that the diffusion factor is taken into account, so that the melting time can be calculated accurately even when the fuse current is relatively small. There is no need to perform many fuse-blowing experiments and the melting time and fuse current can be calculated accurately and easily when the fuse is in a large circuit of a power-supply system.