Mitsubishi 4DQ5 Service Manual Page 80

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(c) Engine starts and alternator charges battery
~----------------~B~------------------~
IC
regulator
........... ...-otl·····
·1,
Battery
":"
(d) Alternator charges battery excessively
~~--------------~B~----------------~~
IC
regulator
As
alternator output voltage rises higher than the
regulated voltage, zener diode Dz permits the
current to flow to the base
of
transistor Qt.
As
transistor
Ql
turns on, the current flows from
the three diodes to transistor
Ql,
causing transistor
Q2
to turn off. Under this condition, the field
current
is
reduced to weaken excitation
of
the rotor
and, consequently,
output
voltage begins to fall.
-76
-
Fuse
box
......
--tII······I..-,.
Battery
":"
When
output
voltage has sufficiently dropped,
zener diode
Dz
permits no current to flow. Now
transistor
Ql
turns
off
and transistor Q2 turns on
and, consequently, the field current increases and
output voltage rises again. This process
is
endlessly
repeated to keep
output
voltage at a virtually
constant level.
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