Answer Posted / bala murugan

In ordinary stabilizer, the transformer has number of
tappings or windings. With the help of relays, the
appropriate tapping can be switched to give output voltage
that is nearly equal to the line voltage required.
But in servo stabilizer there is an error anplifier to
give an error voltage. This vjoltage is got by subtracting
the dc reference vjoltage Cref and dc voltage rectified
from the output line. This voltage drives the servjo motor
in a direction to boost or buck the output voltage from the
secondary of the transformer.
Since the error amplifier continuously monitors the
output voltage, we get constant voltage output. By
adjusting the value of Vref, we can set the desired output
voltage.

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