A voltage regulator is a device that stabilizes the output voltage. The voltage regulator is composed of voltage regulating circuit, control circuit and servo motor. When the input voltage or load changes, the control circuit samples, compares and amplifies, and then drives the servo motor to rotate to change the position of the carbon brush of the voltage regulator. By automatically adjusting the coil turn ratio, the output voltage is stable.

Voltage regulators can be widely used in industrial and mining enterprises, oil fields, railways, construction sites, schools, hospitals, posts and telecommunications, hotels, scientific research and other departments of electronic computers, precision machine tools, computed tomography (CT), precision instruments, test devices, elevator lighting, imported equipment and production lines, etc. It is also suitable for users at the end of low-voltage distribution network with low or high power supply voltage and large fluctuation range and electrical equipment with large load variation, especially for all voltage stabilizing electric fields with high requirements for power grid waveform. High power compensated power regulator can be connected to thermal power, hydraulic and small generators.

Voltage regulator is a kind of power supply circuit or equipment that can automatically adjust the output voltage. Its function is to stabilize the power supply voltage that fluctuates greatly and fails to meet the requirements of electrical equipment within its set value range, so that various circuits or electrical equipment can work normally under the rated working voltage.

With the rapid development of society, electric equipment is increasing day by day. However, due to the aging and lagging development of power transmission and distribution facilities, poor design and insufficient power supply, the voltage of end users is too low, while the voltage of wire end users is often too high. The power consumption equipment, especially the high-tech and precision equipment with strict voltage requirements, is like an indefinite bomb.

As a public power grid, the municipal power system is connected with thousands of various loads. Some of the larger inductive, capacitive, switching power and other loads not only obtain electric energy from the power grid, but also affect the power grid itself, deteriorate the power supply quality of the power grid or local power grid, and cause municipal voltage waveform distortion or frequency drift. In addition, unexpected natural and man-made accidents, such as excessive load voltage, earthquake, lightning stroke, open circuit or short circuit of power transmission and transformation system, will endanger the normal power supply and affect the normal operation of the load.

Unstable voltage will cause fatal injury or misoperation of the equipment, affect production, delay in delivery, unstable quality and other losses. At the same time, accelerate the aging of the equipment, affect the service life and even burn the accessories, so that the owner faces the problem of maintenance or needs to update the equipment in a short time, wasting resources; Serious cases even have safety accidents, resulting in immeasurable losses. Therefore, the use of voltage regulator is essential for electrical equipment, especially high-tech and precision equipment with strict voltage requirements.