ELECTRICAL SYSTEM 7-7
Generator
Regulator / rectifier
Ig.switch
SCR
IC
Load
Battery
When the engine r/min becomes higher, the generated voltage of the generator also becomes higher and the
voltage between the battery terminals becomes high accordingly. When it reaches the adjusted voltage of the
I.C., (Integrated Circuit) and it is turned “ON”, a signal will be sent to the SCR (Thyristor) gate probe and the
SCR will be turned “ON”.
Then, the SCR becomes conductive in the direction from point A to point B. At this time, the current gener-
ated from the generator gets through the SCR without charging the battery and returns to generator again. At
the end of this state, since the AC current generated from generator flows to point B, the reverse current
tends to flow to SCR. Then, the circuit of SCR turns to the OFF mode and begins to charge the battery again.
Thus these repetitions maintain charging voltage and current to the battery constant and protect it from
overcharging.
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