IRS2334SPbF/MPbF
Figure 14: Three phase inverter
DC+ BUS
Q1
ON
I U
V S1
Q2
D2
OFF
DC- BUS
Figure 15: Q1 conducting
Figure 16: D2 conducting
Also when the V phase current flows from the inductive load back to the inverter (see Figures 17 and 18), 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.
DC+ BUS
Q3
D3
OFF
I V
V S2
Q4
D4
OFF
DC- BUS
Figure 17: D3 conducting
Figure 18: Q4 conducting
However, in a real inverter circuit, the V S voltage swing does not stop at the level of the negative DC bus, rather it
swings below the level of the negative DC bus. This undershoot voltage is called “negative V S transient”.
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