A voltage regulator is a device that stabilizes the output voltage. The voltage regulator is composed of a voltage stabilizing circuit, a control circuit and a servo motor. When the input voltage or load changes, the control circuit samples, compares and amplifies, and then drives the servo motor to rotate, so that the position of the carbon brush of the voltage regulator changes, and the coil turn ratio is automatically adjusted to maintain the stability of the output voltage. Let's take a look at the role of the voltage regulator.

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 does not meet the requirements of electrical equipment within its set value range, so as to stabilize various circuits or electrical equipment. The equipment can work normally under the rated working voltage.

At the beginning, the power supply voltage regulator relied on the jump of the relay to stabilize the voltage. When the grid voltage fluctuates, start the automatic correction circuit of the voltage regulator to make the internal relay act. The forced output voltage is kept near the set value. This circuit is a little simple, but the disadvantage is that the voltage stabilization accuracy is not high. Each time the relay jumps, the power supply will be interrupted, resulting in spark interference. This interferes with the reading and writing of the computer equipment, and may cause the computer to produce error signals, or even damage the hard disk in serious cases. Most small voltage regulators use click and drag carbon brushes to stabilize the voltage. The voltage stabilizer has small interference to electric equipment and high voltage stabilization accuracy.

Key points for selection of voltage stabilizer:

It is recommended to purchase a regulator with at least 3 times the actual power, because the regulator needs to overcome the surge impact of mains power and the starting impact of inductive loads (such as refrigerators, air conditioners, motors and motors).

1. When the voltage regulator is used for inductive load, because the instantaneous starting current of inductive load is large, it is generally about 3-5 times of the rated current, and often more than 9 times of the operating current (such as refrigerator, air conditioner, washing machine, fan, etc.). Large air conditioners, printers, air compressors, elevators, water pumps, etc. are all inductive loads), so any voltage regulator that needs to be equipped with inductive loads such as motors and compressors needs to consider its power reserve and reserve margin. Sufficient margin shall be reserved to prevent the surge current generated when the load is turned on from damaging the voltage regulator immediately. If the voltage stabilizer is used in the whole plant, it shall be avoided to start the machine with high-power inductive load at the same time. Therefore, when purchasing the voltage stabilizer, it shall have 1.5 times of the reserved capacity.

2. Pay attention to whether the mains voltage value exceeds the input voltage range specified by the voltage regulator and whether the three-phase voltage difference is greater than 10V.