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IRS25091SPbF
Negative V S Transient SOA
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 11; here we
define the power switches and diodes of the inverter.
If the high-side switch (e.g., the IGBT Q1 in Figures 12 and 13) 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 11: Three phase inverter
DC+ BUS
DC+ BUS
Q1
ON
V S1
I U
Q1
OFF
V S1
D1
I U
Q2
D2
Q2
D2
OFF
DC- BUS
Figure 12: Q1 conducting
OFF
DC- BUS
Figure 13: D2 conducting
Also when the V phase current flows from the inductive load back to the inverter (see Figures 14 and 15), and Q4 IGBT switches on,
the current commutation occurs from D3 to Q4. At the same instance, the voltage node, V S2 , swings from the positive DC bus voltage
to the negative DC bus voltage.
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