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Power electronic technology 1 Profile: Power electronic technology is a new branch applied to power field ,it is a technology which uses the power electronics device (such as thyristor and GTO, IGBT etc.) to transform and control the electric power. The power which transformed by power electronic technology can be big to hundreds of MW even GW, also can be small to several W even under and 1W , the information electronic technology is different from power electronic technology, the power electronic technology is mainly used in electric power transformation.Power electronic technology are put into power electronics device manufacturing technology and communication technology two branches.Power electronic technology has become a indispensable specialized fundamental course in modern electrical engineering and automation major, which playes an important role in cultivating the specialized talented person. Power Electronics this name appears in the 1960s . In 1974, W.N ewell from the United States use a fall triangle to described the Power Electronics, and thinks it is made of the cross of the power of science, electronics and control theory three courses. This view is generally accepted by the world. Power electronics and power electronic technology are called respectively from the academic and technical engineering two different angle . Generally, the birth of power electronic technology is marked by the first thyristor that is developed by American general electric company , the concept and foundation of power electronic technology is established because of the thyristor and brake canal converter technology development. Before electronic technology has been used in power transformation, so the period before the appearance of thyristor can be called of power electronic technology prehistoric or dawn period. In the late 1970s, GTO, Power BJT, Power MOSFET developed with a full speed as a representative of all-controlling devices, and it makes the Power electronic techn