Switching Order Of Power Module; Voltage Waveform At Each Point - Hitachi RAM-55QH5 Service Manual

Upper arm
transistor
Lower arm
transistor
U
Voltage point
A
320-360V
Upper arm transistor
Current at
B
+
V
U –
Fig. 3-2 Switching order of power module
+
transistor chopped
Chopping period
ON
Fig. 3-3 Voltage waveform at each point
E
F
+ +
U
W
V –
T
-
U transistor ON
T
– 81 –
+
V
–
W
Time