SC
SC
SC
SC Battery
Battery
Battery
Battery and
and
and
and Charging
Charging
Charging
Charging System
System
System
System
- 12 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Test
Test
Test
Test
Operating
Operating
Operating
Operating principle
principle
principle
principle of
of
of
of generator
generator
generator
generator
The operating principle of generator: divide three-phase
alternating currents (AC) generated by the three-phase
windings into two paths: take one as field current to go
through 3 excitation diodes 1 to D+ end and voltage
regulator 5, then go through moving contacts and slip
rings to field winding, finally, return to the voltage
regulator through slip rings and sliding contacts; The
other one goes through positive rectifier diode of
three-phase full-wave velocity converter bridge to
electric appliances in the vehicle and then returns
through negative power diodes.
Terminal B+ is an output one and Terminal D+ is
connected to charging indicator lamp and ignition
switch in the external circuit and then is connected to
battery positive pole. When starting the engine, contact
points of the ignition switch are closed and form initial
field current in field winding with the charging indicator
lamps lightening simultaneously (lighting inspection). In
the case of engine in idling operation condition, the
indicator lamp goes out. During vehicle running, if the
charging indicator lamp is lightened, it indicates faults
in generator system.
The hybrid germanium transistor voltage regulator is
adopted in this generator, consisting of a ceramic wafer
with protective resistance and an integrated circuit
enclosed in seal housing. It plays a role in: keeping a
constant output current of AC generator in the case of
wide engine speed range and large output current
change.
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