The working principle of the voltage stabilizer:
All
voltage regulators utilize the same technology to stabilize the output
voltage. The output voltage is sampled (Sampled) through a resistor
divider (ResistiveDivider) connected to the inverting input terminal
(InvertingInput) of the error amplifier (ErrorAmplifier), and the
non-inverting input terminal (Non-invertingInput) of the error amplifier
is connected to a reference voltage Vref. The reference voltage is
generated by the bandgap reference source (BandgapReference) inside the
IC. The error amplifier is always trying to force the inputs to be equal
across it. For this, it provides load current to keep the output
voltage stable:
Vout=Vref(1+R1/R2)
In
fact, this type of voltage regulator using a voltage regulator directly
is made of the principle of an autotransformer. The AN side in the
figure is the input side of the autotransformer, and the BN side is the
output side of the autotransformer. If When the input voltage is higher
than the output set point of 220V, the autotransformer works in a
step-down state, and if the input voltage is lower than 220V, the
autotransformer works in a boost state.
This
voltage regulator is different from the autotransformer mainly in that
the input point A can slide arbitrarily from 0V to 250V. In this way,
the input point of the input voltage can be adjusted at any time to meet
the constant output voltage. Generally, we put the input side A The
point is called the sliding arm, which is driven by the motor through
the reduction gear, and the steering of the motor is controlled by the
voltage regulator control circuit.
The
sampling circuit of the voltage stabilizer monitors the voltage between
the two output points of the voltage stabilizer at all times. When the
output voltage increases, it controls the motor to move in the direction
of the step-down of the autotransformer. When the output voltage
reaches the desired voltage, it stops controlling the motor movement. On
the contrary, the control circuit controls the motor to rotate in the
direction of boosting the autotransformer. It stops when the desired
voltage is reached.
The capacity of
this type of voltage stabilizer is all borne by the autotransformer of
the output voltage transformer, but due to the influence of its
manufacturing process, it cannot be made very large, and can only be
adapted to low-power occasions. If the power of the regulator is made
larger, it is necessary to add a compensation transformer to realize the
power expansion of the regulator.
The
capacity of this type of voltage stabilizer is all borne by the
autotransformer of the output voltage transformer, but due to the
influence of its manufacturing process, it cannot be made very large,
and can only be adapted to low-power occasions. If the power of the
regulator is made larger, it is necessary to add a compensation
transformer to realize the power expansion of the regulator
Three-phase voltage regulator works:
The three-phase voltage stabilizer is actually to connect the three voltage stabilizer units together with the "Y" connection method. Then use the control circuit board and the motor drive system to control the voltage regulator transformer to achieve the function of stabilizing the output voltage. If the three regulators The sliding arms of the voltage transformer are all driven by a motor. The voltage regulation method is a unified voltage regulator. If the sliding arms of the three voltage regulating transformers are independently adjusted by three motors, the voltage regulator is a three-phase separate voltage regulator. regulators. They work exactly the same as single-phase regulators.
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