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What is voltage stabilizer Advice on choosing a voltage stabilizer to suit your needs

What is voltage stabilizer? When to buy voltage stabilizer?

Voltage stabilizer (Voltage stabilizer) is an electrical device capable of transforming voltage and bringing high or low voltage current to a stable level (220V – 110V) based on the principle of electromagnetic induction. Currently, there are 2 power grids: 1-phase and 3-phase, so voltage stabilizers are also divided into 1-phase and 3-phase voltage stabilizers.

In addition to the stabilizing function, most voltage stabilizers have additional features such as input/output low voltage cut-off, input/output high voltage cut-off, overload cut-off, manual/automatic start-up, zero voltage conversion,… stable operation of electrical equipment.


The weak and unstable power source is the main cause of electrical equipment such as televisions, refrigerators, stereos, air conditioners, air conditioners, fans, etc. fire, engine failure.
Here are some cases that immediately think of buying a voltage stabilizer:

Weak and unstable power source: There is a problem in the low voltage power line, the surge in power voltage burns all electrical equipment in the house. Weak electricity makes the air conditioner unable to start, or run slowly, cooling is not deep, only running the fan, so it does not play its full role in cooling the air.

Protecting electrical equipment: On the power line with neighbors in the same area, welding machines are often used, the electricity is flickering, the light bulbs are constantly flashing, causing eye fatigue, and the lamp life is very low.

Stable power source: During peak hours, many families simultaneously use electrical appliances. The cooking of rice is greatly affected by weak electricity, the rice is not cooked or on the bottom of the river.

Using other electrical equipment: The family buys an additional electrical appliance (refrigerator, washing machine, air conditioner…) that uses 100V electricity and does not know how to use it.
With the help of voltage stabilizers with the ability to keep electricity stable, these conditions will be overcome.

2Principle of operation – Effect of voltage stabilizer

The most popular types of voltage stabilizers on the market today will have 5 main operating principles as follows:

Using toroidal transformer combined with brush, take the voltage out directly.

Use a compensating transformer to coordinate with a brushed toroidal transformer or an IGBT semiconductor device.

Use transformers and capacitors.

Use transformers to coordinate relay switching.

Using pulse transformer and electronic circuit.

Principle of operation using a toroidal transformer with brush

Conventional voltage stabilizers have a toroidal transformer wrapped with an electromagnetic wire, with a brush attached to the surface of the wire. The carbon brush will do the job of sliding to get the voltage of each turn of wire.
When the output voltage is low or high, the control circuit will command the motor to operate. Rotate forward or reverse to get the voltage at the loop on the toroidal transformer. When the output voltage is enough 220V, the comparator circuit will command the motor to stop.
And when there is a power failure, the brush will automatically return to the safe position, corresponding to the high input voltage so as not to accumulate voltage when the power is restored.

The principle of single-phase voltage stabilizer is simpler than that of three-phase voltage stabilizer. Each machine has only structure:

1 Control circuit.

1 Toroidal transformer (The larger the capacity, the larger the transformer).

1 Motor drives up and down rotation.

1 Standard size carbon brush with toroidal transformer.

Accessories that come with the machine such as clocks, terminals, indicator lights…

The effect of voltage stabilizer:

– Protection of electrical equipment: The voltage stabilizer will overcome the situation of electricity level above or below the voltage level causing harm to electronic devices, damage to equipment or fire.

– Keep the output voltage stable: When the input voltage changes within the allowable range (called the voltage stabilizer range), it provides an ideal power source to satisfy other electronic devices and protect electronic equipment in the field. family.
External voltage stabilizer: integrates many features to maximize electrical equipment protection, creating a safe electrical system for your family:

Automatic protection of over-current, short-circuit by Circuit Breaker (CB): The voltage stabilizer will automatically cut off power when overloaded, avoiding short-circuiting and fire.

Automatic overvoltage protection by electronic relay: The voltage stabilizer will automatically cut off the voltage when there is a problem that causes the output voltage to be too high (beyond the operating range of the machine) to protect the equipment well. electricity. The voltage stabilizer will automatically turn back on when the fault is over.

Anti-electric shock by Delay, Auto-reset system: The voltage stabilizer will automatically return the brush to a safe position when the power is lost and when the power is restored, the voltage stabilizer has a delay of about 5 seconds to stabilize the voltage after that. power supply to the load.

Some voltage stabilizer models are equipped with Circuit Breaker (CB) reversing: When the voltage quality is low and unstable, we should use this type of voltage stabilizer to improve the life of electrical equipment.

Many voltage stabilizer models are equipped with 2 additional voltmeters or 1 voltmeter with a switch to display input – output voltage: This function makes it easy to accurately monitor the quality of input and output power to make appropriate adjustments.
Steps to choose to buy a voltage stabilizer

Here are 3 steps to choose to buy a voltage stabilizer that suits your needs, you should refer to these 3 steps to choose to buy.

Select phase number

– Currently, voltage stabilizers are classified according to the needs of consumers, including:

Single-phase voltage stabilizer (110V – 220V): Used for home or office appliances.

3-phase voltage stabilizer (200V – 220V – 380V): For factories using industrial electrical equipment.
Select input voltage range

– The input voltage is the range of electricity that the voltage stabilizer can receive at the input to convert into a suitable voltage at the output. When the input voltage fluctuates in the 60V – 250V voltage ranges, the output voltage will be stable in accordance with the equipment used.

For example: If the input current has a voltage of 60V, 90V, 150V, 160V or 250V in the 90V – 250V voltage range, the voltage stabilizer will be converted to an output voltage of 110V – 220V depending on the needs of use with voltage stabilizer type 1. Phase
Select capacity of voltage stabilizer

– Voltage stabilizer capacity is printed on the front of the machine or displayed on the label with the symbol KVA. This is the symbol for the rated power of the voltage stabilizer and the actual power when operating will be expressed in Watt (W). The conversion formula between these two quantities is 1 KVA = 800W.

– When choosing to buy a voltage stabilizer, you need to choose a voltage stabilizer capacity based on the total capacity of the electrical equipment intended to use the voltage stabilizer. Calculating before choosing to buy a voltage stabilizer will help avoid dangerous overload during use


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