6.2 门极-发射极电容CGE的变化
类似于门极电阻的变化,不同的
IGBT关断门极-发射极电容CGE对二极管导通的影响只是体现在整体的切换事件延迟上,如图52,53及54所示。
Max(C2): 15.83V, Max(C3): 77A, Min(C4): -32V
Figure 52: Diode turn-on with RG = 1.8Ω and CGE = 10nF
Max(C2): 15.42V, Max(C3): 75A, Min(C4): -34V
Figure 53: Diode turn-on with RG = 1.8Ω and CGE = 56nF
Max(C2): 15.42V, Max(C3): 77A, Min(C4): -34V
Figure 54: Diode turn-on with RG = 1.8Ω and CGE = 100nF
6.3 低门极电压VGE,min的变化
关于二极管在开通时的转换行为,可以看出,
IGBT驱动电压-8V或者0V对其影响没有差别,只是使整体的切换动作移位。如图55,56所示。文章来源:
http://www.igbt8.com/qd/144.html
Max(C2): 15.83V, Max(C3): 73A, Min(C4): -32V
Figure 55: Diode turn-off with VGE,min = -8V
Max(C2): 15.83V, Max(C3): 77A, Min(C4): -35V
Figure 56: Diode turn-off with VGE,min = 0V