Hitachi RAS-50FH5 - HIC and Peripheral Circuits

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8. HIC and Peripheral Circuits
● Fig. 8-1 shows the micro computer and its peripheral circuits, Table 8-1, the basic operations of each
circuit block, and Fig. 8-2, the system configuration.
Table 8-1
Circuit block
Basic operation
Peak current
cutoff circuit
Set value circuit
Voltage amplifier
circuit
Reset circuit
Trip signal
synthesis circuit
Detects DC current flowing power module and during overcurrent (instantaneous
value) flows, stops upper/lower arm drive circuits and also produces lp signal by
which drive signal output is stopped.
Compares voltage detected, amplified and input to HIC with set voltage value in
microcomputer, and controls overload when set value exceeds input voltage.
Voltage-amplifies DC current level detected by the detection resistor and inputs
this to microcomputer. Internal or external overload is judged in microcomputer.
Produces reset voltage.
Modulates chopper signal to drive signal and stops according to presence/ab-
sence of lp signal or reset signal.
59
17
61
48
58
62
+
+
60
Is
D104
L
CT1
N
R005
0V0V
0V
0V
R221
C218
12V
292R
742R
7
01C
0V
0V
600R
501C
+
+
712C
900C
JW10
R252
R222
R248
IC4
C205
R288
IC5
+

2
3
1
+

6
5
7
Fig. 8-1 Microcomputer and Peripheral Circuits
RESET
Is
Id
Ip
Vd
CN13CN14
R41
R24
N1
IC1
SPM2  HIC
DC260-380V
P2
SPM2
MAIN P.W.B
Direct Current
DC Current
Detection Resistor
OC
F
0V0V
HIC
IC1
622C
0V
5
82R
682R
502D
402D
9
42R
4
82R
0V
522C
422C
0V
0V
222C
0V
0V
4
02C
0V
5
12C
9
82R
0V
0V
5V
5V
3
5
2
R
005R
24R
34R
43C
37
521
19
20
8
99
10
3938
MICROCOMPUTER
0V
R245