Establishment of inverter surge insulation and evaluation technology in next generation power electronic devices and equipment

提出了一种适用于高温至450℃、高压（1.2kV）区域的功率半导体器件的气体绝缘封装方法。通过改变气体介质的种类和压力，对放电起始性能进行了实验研究，并制作了原型包。此外，还研制了SiC逆变器，成功实现了对电机的驱动。该逆变器安装在600W级电动汽车系统中。在此基础上，利用光学和电磁检测传感器构建了逆变器浪涌局部放电测量系统。研究发现，相对湿度对局部放电起始电压的影响最为显著。

A package method using gas insulated medium is proposed for power semiconductor devices in the high temperature range to 450 degree C and high voltage (1.2kV) region. Experiments were performed on discharge inception properties by changing kind and pressure of gas medium, and a prototype package was made. In addition, SiC inverter was developed so as to succeed in driving a motor. The inverter was installed in an electric vehicle system with 600W class. Furthermore, a partial discharge measuring system for inverter surge was constructed using optical and electromagnetic detection sensors. It was found that relative humidity gives the most significant effect on partial discharge inception voltage.