TD=[tpHL(max)- tpLH(min)]+[toff(max)-ton(min)]
IGBT模块门极并联电容对桥臂死区的影响:
Vdrive_H =15V
Vdrive_L = -7V
Rdrive_on = 68
Ω
Rdrive_off = 90
Ω
Cies = 2800*1.5pF:取规格书中Buck_MosFet的参数
Cge1 = 470pF:门极并联的电容
Vge_th = 3.5V
Cies2 = Cies+Cge1
Tg_on1 = Rdrive_on*Cies
Tg_on2 = Rdrive_on*Cies2
Td_on1=Tg_on1 ln(1-Vge_th/Vdriver_H)
Td_on1 = 75.885 nS
Td_on2=Tg_on2 ln(1-Vge_th/Vdriver_H)
Td_on2 = 84.377 nS
Tg_off1 = Rdrive_off*Cies
Tg_off2 = Rdrive_off*Cies2
Td_off1=Tg_off1 ln((Vge_th-Vdrive_L)/(Vdrive_H-Vdrive_L))
Td_off1 = 279.594 nS
Td_off2-Tg_off2 ln((Vge_th-Vdrive_L)/(Vdrive_H-Vdrive_L))
Td_off2 = 310.882 nS
ΔTdead = (Td_off2-Td_off1)-(Td_on2-Td_on1)
ΔTdead = 22.796 nS 为死区减少的时间