Indian Journal of Science and Technology

Abstract

In the case of using fast fuses to protect power semiconductors like power rectifiers, a special attention has to be paid to the relation between the average and RMS values of the currents that flow through a given power converter. This paper presents the expressions to calculate the average and RMS current value in the case of a resistive-load series circuit. Also it is calculated the shape coefficient. It results that from fuses loading in the case of small firing angles, the power semiconductors can not be loaded at their average current. In this situation, the load has to be limited at the RMS fuse current value.
Keywords: Power Loss, Temperature, Fuses, Power Semiconductors.