Hitachi RAC-25CNH11, Service Manual

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Diode stac
k
Reactor
Inr
ush
current protection rela
y
P
o
w
er rela
y
Stic
k rela
y
Noise Filter
Coil
FUSE(15A)
C812 C813
R807
C805
L804
R801
R802
80
F
µ
1000
F
µ
DC current (Id) detect resistance
1
2
U coil
V coil
W coil
DC compressor Motor
u
V
W
u
+
v
+
w
+
u
-
v
-
w
-
P
o
w
er Module
00
0
0
0
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3. Power Module Circuit
●
Fig. 3-1 shows the power module and its peripheral circuits. 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.
Fig.
3-1 P
o
w
er module circuit (U
+
is ON,
V is ON)