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What is the difference between voltage stabilizer and transformer?

2020-06-24

The voltage stabilizer is opposite to the transformer. The transformer is a device that changes the AC voltage. The main components are the primary coil, the secondary coil, and the iron core. In electrical equipment and wireless circuits, it is often used for lifting voltage, matching impedance, and safety isolation. The voltage stabilizer is composed of voltage regulating circuit, control circuit and servo motor. There are many types. The common voltage stabilizers are: high power compensation type power regulator, automatic AC regulator, parameter regulator, Purification power supply ac automatic voltage regulator (avr)  and so on.


We knew in middle school that electricity can generate a magnetic field, and the magnetic field can also be converted into electricity. If alternating current is applied to one coil, an alternating magnetic field is generated. If this magnetic field is passed through another coil, a voltage stabilizer can also be induced on the other coil. This is the principle of a transformer. Simply put, the transformer uses the principle of magnetic coupling.


The voltage stabilizer uses the principle of negative feedback. How does this principle work? For example, turn the tap halfway, and install a sensor at the tap to detect the amount of water. If the amount of water is too large, then Automatically adjust the faucet a little. If the water output is too small, the faucet will be automatically opened to keep the water output constant. The principle of the voltage stabilizer is similar to this: There is a circuit in the voltage stabilizer that can detect the change of the output voltage. When the output voltage changes, this circuit will provide feedback to the servo motor, and then the servo motor drives the arm to automatically adjust the power. The position of the brush to stabilize the output voltage is the simplest voltage regulator. The larger-capacity regulator also uses the principle of voltage compensation.


All voltage stabilizers use the same technique to stabilize the output voltage. The output voltage is sampled through a voltage-dividing resistor connected to the inverting input of the error amplifier, and the non-inverting input of the error amplifier is connected to a reference voltage. The error amplifier always tries to force its inputs to be equal. To this end, it provides load current to ensure that the output voltage is stable (that is, negative feedback).


It should be noted that although the transformer does not have a voltage stabilizing effect, it is possible to design a transformer with a voltage stabilizing effect using negative feedback technology, which is not a problem, but general transformers are not like this. The output voltage of the transformer within a certain range of use does not change much, and what we call voltage regulation is not a concept.


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