微电子技术与电力电子技术相结合,不但使电力电子领域为控制部分向数字化、小型化和高性能方向发展,而且使功率半导体器件自身向高耐压、大容量和高频化方向发展.功率半导体器件中,作力电力电子学基石的晶闸管具有大电流特性,但无自关断能力;广泛使用的双极晶体管需较大的基极驱动电流;可关断晶闸管GTO能在比双极晶体管更大的电流密度下工作,但开关速度低且门极关断电流大; The combination of microelectronics technology and power electronics technology not only makes the control part of the power electronics field towards digitization, miniaturization and high performance, but also makes the power semiconductor device itself develop toward high withstand voltage, large capacity and high frequency. Semiconductor devices, power electronics cornerstone of thyristors with high current characteristics, but no self-turn-off capability; widely used bipolar transistors need a large base drive current; thyristor thyristor can be in the bipolar transistor Larger current density work, but the switching speed is low and the gate off current is large;