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 (ErrorAmp1 ifier), 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)
Principle Analysis of Single-Phase AC Voltage Regulator
Principle Analysis of Single-Phase SVC Direct Voltage Regulator
Point A is the input side of the single-phase regulator, and point B is the output side of the single-phase regulator
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 220, the autotransformer works in a step-down state. If the input voltage is lower than 220V, the autotransformer works in a boost state. (The figure is in the step-down state. state)
This regulator is different from the autotransformer mainly in that the input point A can slide arbitrarily between 0 and 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 eight The point is called the sliding arm, which is driven by the motor through the reduction device, 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, the motor is controlled to move in the direction of the step-down of the autotransformer, as shown in Figure 2) When the output voltage reaches the desired voltage, stop the control On the contrary, the control circuit controls the motor to rotate in the direction of boosting the autotransformer. (Figure 3) Stop 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 is larger, a compensation transformer should be added to realize the power expansion of the voltage regulator.
The working principle of the three-phase voltage stabilizer:
The three-phase voltage stabilizer is actually to connect the three voltage stabilizer units with the """ 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 three voltage regulator transformers are used The sliding arms of the three voltage regulating transformers are all driven by a single motor. The working principle is exactly the same as that of the single-phase voltage regulator.
