正向稳态到零输入态P^+-N-N^+功率二极管瞬变研究

Study on Transient Response of P^+-N-N^+ Power Diode from Forward Steady-State to Zero Input

从半导体器件物理角度,分析了从正向恒定电流IF(3A)转变到零输入的P+-N-N+功率二极管的瞬态响应,解释了瞬态过程中电流反向并达到反向峰值IR-peak(IR-peak>IF)的原因。通过在检测电路中采用反向平衡电流源,减小被短路的正向恒流电源对零时刻二极管瞬态响应的干扰,并利用仿真软件Silvaco-Atlas进行瞬态仿真,对结论进行了验证。

From the viewpoint of semiconductor device physics,transient response of P＋-N-N＋ power diode in the transition from forward steady-current IF（3 A） to zero input was analyzed,and the root cause for current inversion and peak reverse current IR-peak（IR-peak IF） in the transition was explained.By designing a test circuit with counterbalance current source,interference of shorted forward steady-current source to response of the power diode at zero-input was reduced.The analysis and conclusion were verified by transient simulation with Silvaco＇s simulation software Atlas.