Alternator With Neutral Diodes; Features - Mitsubishi 6M60-TL Service Manual

2.1 Alternator with neutral diodes

(1) Features

• The alternator with neutral diodes pro-
vides higher DC output during opera-
tion at high speeds than the alternator
without neutral diodes.
(2) Variations of voltage at neutral
point and operation of neutral di-
odes
• The potential at the neutral point var-
ies up and down with the neutral point
DC voltage (1/2 of output voltage) as a
center as shown.
• When the alternator is operated at
high speeds, the voltage at the neutral
point can increase to exceed the out-
put voltage (28 V) and decrease to be-
come lower than the ground voltage (0
V), and these voltages are lost in con-
ventional system. The neutral diodes
rectifies these over-voltage and under-
voltage (shaded portions of diagram)
and adds them to the DC output.
• When the voltage at neutral point is in
the range from 0 to 28 V, the conven-
tional diodes (other than neutral di-
odes) operate.
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