Power semiconductor devices are high-power devices that perform power conversion and control. An electronic device that can be directly used in the main circuit for processing electrical energy to achieve the transformation or control of electrical energy. Mainly used in rectifier, inverter, chopper, AC voltage regulator, etc., widely used in various fields such as industrial and agricultural production, national defense, transportation, etc. In the rectifier class, rapid recovery diodes will have significant development. In high-voltage direct current transmission, thyristors (photo controlled thyristors) will have good development opportunities. Among the power transistors, IGBT has developed the fastest
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