IGBT驱动有效死区时间计算与仿真
1.死区的定义
图1 双脉冲的原理示意图
图1中参数的定义:
•
t
d(on): from 10% of
V
GE to 10% of
I
C
•
t
r: from 10% of
I
C to 90% of
I
C
•
t
d(off): from 90% of
V
GE to 90% of
I
C
•
t
f: from 90% of
I
C to 10% of
I
C
死区计算公式定义:
t
dead
= [tf+(t
d
_
off
_
max
−
t
d
_
on
_
min )
+ (t
pdd
_
max
−
t
pdd
_
min)]
×
1
.5
公式中参数定义:
图2 IGBT驱动电路示意图
5.1
R29
VGE
C21
L12
13n
VGE1
L19
7n
Vce
L10
13n
Q7
Ig
Vle
ICE
VG
图3 IGBT实物模型仿真图
3.门极电阻电容容差分析
3.1 门极开通电阻容差分析
AC1206国巨贴片电阻温度系数TCR=±50ppm/℃
门极开通电阻:
R
Gon
3.3 5.1+( )Ω 8.4 Ω=:=
常温: t
1
25:=
工作最高温: t
2
105:=
AC1206国巨贴片电阻影响因数及其容差:
高温暴露正偏差:R
Gon_P_HT
R
Gon
1 1.0%+( ) 0.05Ω+ 8.534 Ω=:=
高温暴露负偏差:R
Gon_N_HT
R
Gon
1 1.0%-( ) 0.05Ω- 8.266 Ω=:=
潮湿正偏差: R
Gon_P_MO
R
Gon
1 0.05%+( ) 0.05Ω+ 8.454 Ω=:=
潮湿负偏差: R
Gon_N_MO
R
Gon
1 0.05%-( ) 0.05Ω- 8.346 Ω=:=
偏置湿度正偏差:R
Gon_P_BH
R
Gon
1 1.0%+( ) 0.05Ω+ 8.534 Ω=:=
偏置湿度负偏差:R
Gon_N_BH
R
Gon
1 1.0%-( ) 0.05Ω- 8.266 Ω=:=
使用寿命正偏差:R
Gon_P_OL
R
Gon
1 1.0%+( ) 0.05Ω+ 8.534 Ω=:=
使用寿命负偏差:R
Gon_N_OL
R
Gon
1 1.0%-( ) 0.05Ω- 8.266 Ω=:=
焊温正偏差: R
Gon_P_SH
R
Gon
1 0.05%+( ) 0.05Ω+ 8.454 Ω=:=
焊温负偏差: R
Gon_N_SH
R
Gon
1 0.05%-( ) 0.05Ω- 8.346 Ω=:=
TCR
负偏差
:
R
Gon_N_TCR
R
Gon
1
50
10
6
t
2
t
1
-
(
)
-
8.366
Ω
=
:=
饱和蒸汽正偏差:R
Gon_P_FOS
R
Gon
1 0.05%+( ) 0.05Ω+ 8.454 Ω=:=
饱和蒸汽负偏差:R
Gon_N_FOS
R
Gon
1 0.05%-( ) 0.05Ω- 8.346 Ω=:=
正容差的阻值:
ΔR
Gon_P
R
Gon_P_HT
R
Gon
-
( )
2
R
Gon_P_MO
R
Gon
-
( )
2
+ R
Gon_P_BH
R
Gon
-
( )
2
+
R
Gon_P_OL
R
Gon
-
( )
2
R
Gon_P_SH
R
Gon
-
( )
2
+ R
Gon_P_TS
R
Gon
-
( )
2
++
...
R
Gon_P_BF
R
Gon
-
( )
2
R
Gon_P_TCR
R
Gon
-
( )
2
+ R
Gon_P_FOS
R
Gon
-
( )
2
++
...
R
Gon
3.143 %=:=
R
Gon_P
R
Gon
1 ΔR
Gon_P
+
( )
8.664 Ω=:=
负容差的阻值:
ΔR
Gon_N
R
Gon_N_HT
R
Gon
-
( )
2
R
Gon_N_MO
R
Gon
-
( )
2
+ R
Gon_N_BH
R
Gon
-
( )
2
+
R
Gon_N_OL
R
Gon
-
( )
2
R
Gon_N_SH
R
Gon
-
( )
2
+ R
Gon_N_TS
R
Gon
-
( )
2
++
...
R
Gon_N_BF
R
Gon
-
( )
2
R
Gon_N_TCR
R
Gon
-
( )
2
+ R
Gon_N_FOS
R
Gon
-
( )
2
++
...
R
Gon
3.143 %=:=
R
Gon_N
R
Gon
1 ΔR
Gon_N
-
( )
8.136 Ω=:=
3.2 门极关断电阻容差分析
偏置湿度负偏差:R
Goff_N_BH
R
Goff
1 1.0%-( ) 0.05Ω- 14.899 Ω=:=
使用寿命正偏差:R
Goff_P_OL
R
Goff
1 1.0%+( ) 0.05Ω+ 15.301 Ω=:=
使用寿命负偏差:R
Goff_N_OL
R
Goff
1 1.0%-( ) 0.05Ω- 14.899 Ω=:=
焊温正偏差: R
Goff_P_SH
R
Goff
1 0.05%+( ) 0.05Ω+ 15.158 Ω=:=
焊温负偏差: R
Goff_N_SH
R
Goff
1 0.05%-( ) 0.05Ω- 15.042 Ω=:=
热冲击正偏差: R
Goff_P_TS
R
Goff
1 0.05%+( ) 0.05Ω+ 15.158 Ω=:=
热冲击负偏差: R
Goff_N_TS
R
Goff
1 0.05%-( ) 0.05Ω- 15.042 Ω=:=
板弯曲正偏差: R
Goff_P_BF
R
Goff
1 0.05%+( ) 0.05Ω+ 15.158 Ω=:=
板弯曲负偏差: R
Goff_N_BF
R
Goff
1 0.05%-( ) 0.05Ω- 15.042 Ω=:=
TCR正偏差: R
Goff_P_TCR
R
Goff
1
50
10
6
t
2
t
1
-
( )
+
15.16 Ω=:=
TCR负偏差: R
Goff_N_TCR
R
Goff
1
50
10
6
t
2
t
1
-
( )
-
15.04 Ω=:=
饱和蒸汽正偏差:R
Goff_P_FOS
R
Goff
1 0.05%+( ) 0.05Ω+ 15.158 Ω=:=
饱和蒸汽负偏差:R
Goff_N_FOS
R
Goff
1 0.05%-( ) 0.05Ω- 15.042 Ω=:=
正容差的阻值:
ΔR
Goff_P
R
Goff_P_HT
R
Goff
-
( )
2
R
Goff_P_MO
R
Goff
-
( )
2
+ R
Goff_P_BH
R
Goff
-
( )
2
+
R
Goff_P_OL
R
Goff
-
( )
2
R
Goff_P_SH
R
Goff
-
( )
2
+ R
Goff_P_TS
R
Goff
-
( )
2
++
...
R
Goff_P_BF
R
Goff
-
( )
2
R
Goff_P_TCR
R
Goff
-
( )
2
+ R
Goff_P_FOS
R
Goff
-
( )
2
++
...
R
Goff
2.49 %=:=