Also known as an Automatic Voltage Regulator (AVR) or Voltage Regulator (VR), an Automatic voltage stabilizer stabilizes the mains power supply voltage to a load. It is a feature of Line Interactive uninterruptible power supplies and provides protection from power problems such as sags, brownouts and surges.

It is an electrical appliance which is designed to deliver a constant voltage to a load at its output terminals regardless of the changes in the input or incoming supply voltage. It protects the equipment or machine against over voltage, under voltage, and other voltage surges.

There are huge varieties of automatic voltage regulators are available in today’s market. These can be single or three-phase units as required by the type of application and capacity needed. Three-phase stabilizers come in two versions as balanced load models and unbalanced load models.


1.    SERVO

A servo voltage regulator provides stabilized voltage by changing the winding ratio of its transformer based on a negative feedback circuitry. It features a moving mechanism in the form of a servo motor and an attached carbon brush.


When you require a low-maintenance AVR that operates reliably in harsh environments, the magnetic induction regulator is an ideal choice. The magnetic induction voltage regulator can sometimes be confused with an induction motor.

The principle of the magnetic induction voltage regulator is to alter the proximity between the primary and secondary winding. By doing so, the magnetic flux coupled across the windings changes in magnitude and orientation. Depending on the relative positioning of both windings, the output voltage can be increased or decreased to a limit.


Most static tap regulators are offered in 3 or 6 taps configurations. If you require precise voltage regulation, this isn’t the right technology. A static regulator with 3 taps will offer around 10% of tolerance. Even with 6 taps, you’ll get at most a ±5% tolerance from the nominal value. For applications that demand precise regulation, static tap regulators are not good enough.


Unlike most regulators, the CVT is categorically a passive device. It features a magnetic core driven to saturation and a tank circuit to negate the potential side effects of a transformer operating in saturation. With no moving parts, the Ferro resonant regulator is not subjected to mechanical wear and tear.


•      Very accurate output voltage regulation

•      Wide choice of kVA rating, voltage and configuration

•      Easily applicable to outdoor application

•      High tolerance to system faults and overload

•      High tolerance to power factor and frequency deviations

•      Good line isolation

•      Relatively inexpensive

•      Speed of voltage correction correct may not be fast enough for electronic loads


Almost all medical equipment needs to be powered by electricity. In addition to medical equipment related to the technology and performance of the machine itself, the normal supply of electricity is also crucial. The normal use of medical equipment is related to the life of the patient, and a slight misstep can cause irreversible results.

The stability and reliability of power supply are related to the lifeblood of patients. Advanced equipment also poses challenges to power supply. During the use of medical equipment, there will be problems such as inability to work under DC and AC, electrical failure, inability to start, and output. Alarm failure, leakage, burns, button failure and other phenomena caused by equipment also occur frequently. Therefore, in this case, a special voltage regulator for medical equipment is generally used to maintain the stability of the output voltage. However, as long as it is a voltage stabilizer, it can be regarded as a special voltage stabilizer for medical equipment, but a voltage stabilizer that meets the requirements of medical equipment is a high-quality voltage stabilizer among the voltage stabilizers.

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