Hitachi RAS-20CNHZ2 - Page 68

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3. System Power Module Circuit
●
Fig. 3-1 shows the system power module and its peripheral circuit. (Current ACT module and power module are combined into one u
nit.)
The three transistors on the positive e side are called the upper arm, and the three transistors on the negative d side, the lower arm.
+
W
U
V
W
W
–
+
V
V
–
+
U
U
–
A
+
–
DC
Compressor
motor
U coil
V coil
W coil
System Power module 2
+
–
+
–
+
–
R24
ACT MODULE
0.35
m
H
Power relay
Coil
R002
R003
Inrush current
protection
relay
C006
R004
Noise filter
coil
L
N
Terminal
board
FUSE (25A)
INVERTER
Fig. 3-1 System power module circuit (U
+
is ON, V
–
is ON)