– 77 –
7. Peripheral circuit of microcomputer
● Fig. 7-1 shows the microcomputer and its peripheral circuits.
Table 7-1, the basic operations of each circuit block, and Fig. 7-2, the system configuration.
R24
R245
Detection resistor
DC current
SPM
terminal
0V
5V
5V
D205
R222
R221
C283
R247
R338R110
R108
C105
C103
CT1
C282
Is
D104
R249
0V
0V
0V0V
0V
0V
IC4
0V
0V
SPM
terminal
R248
C281
Reset
IP cutter
Id
(AX-6V01)
Outdoor
Microcomputer
0V
0V
C224
5V
Q212
Q205
C223
R368
R369 R367
R365
C351
R366
R345
Is
6
8
4
5
7
48
16
60
61
12V
ZD201
Fig. 7-1 Peripheral circuit of microcomputer (AX-6S)
Table 7-1
Circuit block
Basic operation
Peak current
cutoff circuit
Overload external
judgment circuit
Voltage amplifier
circuit
Reset circuit
This circuit detects DC current flowing power module: When over-current
(instantaneous value) flows, it stops upper and lower arm drive circuit and also
produces lp signal to stop microcomputer.
This circuit detects DC current flowing to power module and produces signal to
notify microcomputer of overload status.
This circuit voltage-amplifies DC current level detected by detection resistor and
sends it to microcomputer. In addition, setting of internal/external overload
judgment is performed.
This circuit produces reset voltage.
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