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6F3A4768
5.1.4 Three-level Converter Operation
Fig. 5.1.9 and Fig.5.10 show the main circuit operation principle for the three-level IGBT converter.
(1) When Q1 and Q2 are ON (positive current)
(2) When Q2 and Q3 are ON (positive current) (3) When Q3 and Q4 are ON (positive current)
Fig. 5.1.9 Main Circuit Operation for Three-level Inverter
P(+900V)
N(-900V)
Q1
Q2
Q3
Q4
D5
D6
Power supply
P(+900V)
N(-900V)
Q1
Q2
Q3
Q4
D5
D6
Power supply
P(+900V)
N(-900V)
Q2
Q3
Q4
D5
D6
Power supply
Q1
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