Hitachi RAS-D18EX3 - Power Module Circuit Description

– 120 –
Fig. 3-1 shows the power module and its peripheral circuit.
The three transistors on the positive + side are called the upper arm, and the three transistors on the negative - side, the lower arm.
3. Power Module Circuit
W coil
V
A
DC
compressor
motor
U
U coil
V coil
W
R24
+
-
+
-
+
-
System Power module2
Fig. 3-1 Power module circuit (U
+
is ON, V
-
is ON)
W
-
V
-
U
-
W
+
V
+
U+
FUSE (25A)
0.35mH
Noise filter
coil
Ter minal
board
L
N
R008
Inrush current
protection
relay
C006
C503
C501
C502
R007
R001
Power relayCoil
B