Ac Regulator Function; Single Phase, Full-Wave Rectifier - Honda Motorcycle Service Manual

BATTERlESlCHARGlNGlLlGHTlNG SYSTEM
AC Regulator Function:
The AC regulator regulates the voltage t o the headlight; no
resistor is required. When the negative output of the charging
coil reaches a certain voltage, the AC regulator feeds current
t o the gate of SCR2 and turns it ON. The SCR2 is shorted and
a negative current to the coil regulates its output voltage.
Since the negative output voltage of the charging coil is not
used for charging the battery, the AC regulator has no effect
on charging the battery.
WAVEFORM OF@
WAVE FORM
. '
. . :
....
However, since when the negative output of the coil is cut off
the headlight voltage is also cut off, the AC regulator regulates
v
HEADLIGHT POWER
the output voltage to the headlight.
Single Phase, Full-Wave Rectifiers
These are used on medium engine displacement models.
Compared to the half-wave rectifier, the full-wave rectifier is
more efficient in using the alternator output for charging the
battery.
In order to convert the AC output of the alternator to DC, the
diodes are arranged as in the diagram at right, inside the
regulatorlrectifier. When the alternator is positive, the current
flows through D l
--,
battery- D 2 (shown by the white
arrows) and when the alternator is negative the current flows
through D3- battery - D 4 (represented by the black
arrows)
In this way, the AC output of the alternator is converted to a
DC waveform.
Similar to the single phase half-wave recitifier, the full-wave
rectifier may be a battery voltage feedback type or an internal
voltage feedback type. The circuit at right shows the battery
voltage feedback rectification method.
RECTIFI-
I
,
I
-
AC
VOLTAGE
REGULATORIRECTIFIER FEFDBACK LINE
Date of Issue: March, 1995
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HONDA MOTOR CO.,LTD,