P^+-N-N^+功率二极管零输入态反向电流峰值研究

Study on Peak Reverse Current of P^+-N-N^+ Power Diodes at Zero-Input-State

从半导体器件物理角度出发,分析了P+-N-N+功率二极管零输入态下正向恒定电流IF与反向电流峰值IRM的解析关系。根据误差函数与初等函数的近似关系,推出简约解析关系式:(IRM/IF)=a+b×ln(IF+1)。在检测电路中引入反向平衡电流源,利用仿真软件Silvaco-Atlas获得瞬态仿真实验数据。通过Matlab软件对实验数据进行拟合分析,并对简约式适用范围和相关结论进行了验证。研究结果对P+-N-N+功率二极管的应用和相应电路系统的可靠性具有指导意义。

Relationship of forward steady-current IF with peak reverse current IRM for P＋-N-N＋ power diode at zero-input state was analyzed from the viewpoint of semiconductor device physics. Based on approximation relation of error function with elementary function, a reduced analytical expression was derived： （IRM/IF） = a ＋ b X In （IF ＋1）. A counterbalance current source was introducecl into test circuit. Experimental data were collected using Silvaco - Atlas transient simulation. Validity of the reduced analytical expression and relevant conclusions were verified with goodness fitting test by Matlab. This work is instructive for application of P^＋-N-N＋ power diode, and reliability improvement of corresponding circuit and systems.