A voltage stabilizer is a device that stabilizes the output voltage. It is composed of a voltage regulation circuit, a control circuit, and a servo motor. When the input voltage or load changes, the control circuit performs sampling, comparison and amplification. Then it drives the servo motor to rotate to change the position of the carbon brush of the voltage regulator. By automatically adjusting the coil turns ratio, the output voltage is kept stable. Today we will introduce the working principle of the voltage stabilizer, its function and its application. We hope that after reading this article, you will have a better understanding the functions of voltage regulators.