d on power electronic technology are the key equipment to build DC power grid. Large capacity semiconductor devices are the core components of these key equipment. Low cost, low loss and high reliability of large capacity semiconductor devices are very important to improve the economy and safety of DC power grid equipment. Among high-power power electronic devices, IGBT (insulated gate bipolar transistor) is mainly used at present, while IGCT (integrated gate to gate commutated thyristor) is a more potential semiconductor device. The market is mainly occupied by foreign enterprises such as abb in Switzerland, Infineon in Germany, Ge in the United States, and there is a wide space for domestic substitution
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