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IRS2336x(D) Family
DC+ BUS
D BS
V CC
V B
(x3)
HO
C BS
(x3)
V S
R G,HO
(x3)
V S1
V S2
V S3
LO
ITRIP
(x3)
R G,LO
+
+
+
V SS
COM
V GE1
-
V GE2
-
V GE3
-
R 2
R 0
+
V X
R 1
-
DC- BUS
Figure 24: Separate V SS and COM pins
Tolerant to Negative V S Transients
A common problem in today’s high-power switching converters is the transient response of the switch node’s voltage
as the power switches transition on and off quickly while carrying a large current. A typical 3-phase inverter circuit is
shown in Figure 25; here we define the power switches and diodes of the inverter.
If the high-side switch (e.g., the IGBT Q1 in Figures 26 and 27) switches off, while the U phase current is flowing to
an inductive load, a current commutation occurs from high-side switch (Q1) to the diode (D2) in parallel with the low-
side switch of the same inverter leg. At the same instance, the voltage node V S1 , swings from the positive DC bus
voltage to the negative DC bus voltage.
Figure 25: Three phase inverter
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? 2009 International Rectifier
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