IGBTs are the core of the power electronics equipment. If a short-circuit fault occurs in the IGBT and it cannot be protected in time, the equipment will probably suffer damage, which even can cause a severe accident and economic loss. Therefore, it is necessary to take precautions to protect the equipment, especially the military devices of high reliability. The IGBT generally depends on accessory drivers for protection when a short-circuit fault occurs, but now they are not yet qualified for fault detection and prevention perfectly. For this reason, to solve the problems of hard or soft short-circuit and overcurrent in the IGBT, this paper analyzes the electrical signal characteristics of its short-circuit faults, compares various kinds of short-circuit fault detection plans and proposes a scheme of online estimation for the IGBT collector current by use of its driver with simple op amp circuit. Thus, IGBTs fault can be perfectly detected.
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