— 114 —
6F3A4768
(4) When Q1 and Q2 are ON (negative current)
(5) When Q2 and Q3 are ON (negative current)
(6) When Q3 and Q4 are ON (negative current)
Fig. 5.1.10 Main Circuit Operation for Three-level Converter
In the three-level converter, three levels of voltage (P potential, C potential, and N potential) can be output by
turning on/off four IGBTs from 01 (IGBT1) to 04 (IGBT4).
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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