The device structure and physical models of 4h - sic mosfet and mesfet are built and the properties are simulated with the use of medici software . the influence of the temperature and structure parameter on the device ' s properties is summarized indicates that no negative resistance exists in breakdown property and the breakdown voltage is up to 85v and 209v separately . the maximum power density of 4h - sic mesfet is as high as 19 . 22w / mm . at the same time , the processes of sic field - effect transistor is studied and the fabrication processes suitable to sic mosfet are developed . 论文分析建立了4h - sicmosfet和mesfet器件的结构模型和物理模型,采用二维器件模拟软件medici对4h - sicmosfet和mesfet的输出特性进行了模拟分析,研究了温度和结构参数对器件特性的影响,表明两种器件的击穿特性均没有负阻现象,击穿电压分别达到85v和209v ,由此得到4h - sicmesfet最大功率密度可达到19 . 22w mm ;同时,研究了sic场效应晶体管的制作工艺,初步得到了一套制造sicmosfet器件的制造工艺流程,研制出了4h - sicmosfet器件。
The key parts of barretter are made of irf840 field - effect transistor , the magnetic ring and high frequency choking coil which adopting negative temperature index . such components can provide barretters a wide applicable voltage 160v - 250v . low power consumption , minor temperature rise , stable functions , long life - span 镇流器核心元件采用irf840场效应三极管,磁环及高频扼流圈采用负温系数,这样的元件选择使整流器适用电压范围宽160v - 250v ,功耗低,温升小,性能十分稳定,确保其拥有很长的寿命。