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ZH Liang - AI AP
05 Dec 2003
Page 1
for internal use only
Infineon Technologies Asia Pacific
IGBT Gate Drive: Current & Power
Values of C
ies
& C
res
are given in IGBT data sheet.
The factor of 5 (or 6) is used due to the effect of C
res
(high ∆V, high ∆Q).
+R
O_Driver
Miller
Capacitor
C
G
E
ZH Liang - AI AP
05 Dec 2003
Page 4
for internal use only
Infineon Technologies Asia Pacific
IGBT Gate Drive: Gate Resistors
It is necessary to use gate resistors (R
g
) because the
switching speed should be limited in order to reduce
di/dt & dv/dt and hence over-voltage & EMI problem.
The cost of using R
g
is the increase of switching losses.
To set switch-on & switch-off time separately, Rg can be
split into R
g_ON
and R
g_OFF
.
R
g_ON
R
g_OFF
Driver
R
g_OFF
R
g_ON
Driver
ZH Liang - AI AP
05 Dec 2003
Page 5
for internal use only
Infineon Technologies Asia Pacific
IGBT Gate Drive: Power Supplies
Gate driving voltage for IGBT
turn-on is normally +15V.
Gate driving voltage for IGBT
turn-off can be 0V or negative
(-5V to -15V).
Negative gate driving voltage
helps IGBT switch off faster &
remain in off state, but it
needs dual power supplies.
Whether to use 0V or negative
gate driving voltage depends
on the requirement on cost &
performance.
With Single Power Supply
+15V
0V
Driver
With Dual Power Supplies
+15V
0V
-15V
Driver
ZH Liang - AI AP
05 Dec 2003
Page 6
for internal use only
Infineon Technologies Asia Pacific
IGBT Gate Drive: Interface
Opto-couplers is commonly used as interfacing
devices for applications where both signal
transmission and potential isolation are required.
Opto-couplers offers reliable isolation between IGBT
(high-potential) & micro-controller (low-potential).
Opto-couplers has long signal delay (µs) and is
expensive.
+V
CC
+V
DD
Micro-
controller
Isolation
Driver
ZH Liang - AI AP
05 Dec 2003
Page 7
for internal use only
Infineon Technologies Asia Pacific
IGBT Gate Drive: Half-bridge Drive
Standard configuration: 2 drivers, 2 power supplies, 2 opto-couplers
Advantages: standard, reliable
Disadvantages: using opto-couplers, higher system cost
+V
CC1
+V
DD1
Micro-
controller
Isolation
Driver
+V
CC2
+V
DD2
Driver
-V
CC1
-V
CC2
剩余103页未读,继续阅读
资源评论
- zhaoweiblue2014-12-15非常好的资料,讲的非常全,对驱动学习很有帮助
- vivi01262016-03-03非常感谢。很好的资料
- u0104710532014-07-12感觉非常实用。
tengyu421
- 粉丝: 0
- 资源: 1
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