How Does AC Voltage Stabilizer Work?

AC voltage stabilizer introduction

AC compensating electric power voltage stabilizer (Hereinafter referred to as AC voltage stabilizer), it is introduced and absorbed from Western Europe and Japan advanced technology, meanwhile, combining the reality of China’s power grid, designed to stabilize the AC voltage. When the mains voltage fluctuates it can maintain the stability of output voltage automatically.

Compared with other types of voltage stabilizers, this series of products have the characteristics of large capacity, high efficiency, no waveform distortion, stable voltage stabilization, strong control function, and complete varieties. After the load is applied, it can withstand instantaneous overload, long-term continuous work, and manual/automatic switching at will. It has automatic protection devices, such as overvoltage and under voltage, and has the advantages of small size, lightweight, convenient use and installation, and reliable operation. Phase sequence or other protection functions can be customized.

AC voltage stabilizer structure

lt consists of a three-phase compensation transformer, three-phase regulating transformer, transmission mechanism, brush contact system, cabinet, and control system, etc. Three-phase regulating transformer bobbin winding outside surface after polishing processing, remove the insulation, the conductor surface smooth, so that the brush is a good contact. The transmission mechanism consists of motor and worm gear, sprocket, chain. The Brush system structure is reasonable and reliable to ensure brush pressure. Using the close cabinet, small volume, good heat dissipation, and instrument measuring position distinct and accurate indicating.

AC voltage stabilizer working principle

This series voltage stabilizer is insisted by the three-phase compensation transformer TB, three-phase voltage regulating transformer TUV inspection unit, motor control, and drive mechanism, touch operation circuit, protect circuit, etc. Its electrical schematic diagram 1.

Three phase ac voltage stabilizer electrical schematic diagram
Three phase AC voltage stabilizer electrical schematic diagram 1

The primary winding of regulating transformer TUV is Y type, connected to the output of the voltage stabilizer. The secondary winding connects the primary winding of the compensation transformer TB, and the compensation transformer working principle, as shown in the electrical schematic diagram 2.

Single phase AC voltage stabilizer electrical schematic diagram
Single phase AC voltage stabilizer electrical schematic diagram 2

Excluding compensation transformer impedance voltage drop, seen from graph 2: Uao = Uai + Uac.


  • Uai – voltage stabilizer A phase input voltage;
  • Uao – voltage stabilizer A phase output voltage;
  • Uac – voltage stabilizer A phase compensation voltage;

The working principle of this AC voltage stabilizer is: when A phase input voltage Uai increase △Uai, compensating voltage Uac also change accordingly △Uac and △Uac = -△Uai, make A phase output voltage Uao remains unchanged. So is the same phase B, C phase. The regulated process is: According to the change of output voltage, the voltage detection unit, sampling, testing and SM output signal control motor rotation, the chain drives the regulating transformer TUV brush set on the slide (or roll) to adjust the second voltage of the voltage regulator, by changing the polarity and the size of the compensating voltage, realize the stable output voltage automatically within the scope of the voltage regulation precision allowed, so as to achieve the goal of the automatic voltage stabilizer.

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