A voltage stabilizer refers to a device designed in electronic engineering to automatically maintain a certain voltage. The voltage stabilizer may contain a simple "feedforward" design or a negative feedback control circuit.

A voltage stabilizer may also use electromechanical mechanisms and electronic modules. According to the design, voltage stabilizers are divided into DC stabilizers and AC stabilizers. Voltage stabilizers are often used in power supply systems, working in conjunction with rectifiers, electronic filters, etc. to provide stable output voltages such as the working voltage required by microprocessors and other components.

The working principle of the voltage stabilizer is to use the voltage regulation of the circuit and the control of the circuit to control the current. Generally, when the voltage input changes, the voltage stabilizer will perform sampling and comparison through the control circuit, and drive the rotation of the servo motor to change the position of the voltage regulator carbon brush. By automatically adjusting the coil, the output voltage is more stable, so that the electrical appliance can be used normally under unstable voltage conditions.

In the voltage stabilizer, the voltage correction under the conditions of voltage and voltage is performed through two basic operations, namely, boost and buck operations. These operations can be switched manually or automatically by electronic circuits. Under voltage conditions, the voltage of the boost operation increases to the rated level, while the voltage reduction operation reduces the voltage level under overvoltage conditions.

Precautions when using the voltage stabilizer

1. Avoid violent vibration, prevent corrosive gases and liquids from flowing in, prevent irrigation and place in a ventilated and dry place, and do not cover with fabric to hinder ventilation and heat dissipation.

2. Please use a three-pin (grounded) socket, and the grounding screw on the machine must be properly grounded, otherwise the casing will be charged when tested with a tester. This is caused by the induction of distributed capacitance, which is a normal phenomenon and can be eliminated by grounding. If the casing has serious leakage, the insulation resistance is less than 2MΩ, it may be that the insulation layer has been damp or the line and the casing are short-circuited. The cause should be found out and the fault should be eliminated before use.

3. 0.5~1.5KVA low-power voltage stabilizer uses fuse for overcurrent short-circuit protection, 2~40KVA voltage stabilizer uses DZ47 circuit breaker for overcurrent and short-circuit protection. If the fuse often blows or the circuit breaker often trips, check whether the power consumption is too large.

4. When the output voltage exceeds the protection value (the phase voltage protection value is adjusted to 250V±5V at the factory), the voltage stabilizer automatically protects and cuts off the output voltage of the voltage stabilizer. At the same time, the overvoltage indicator light is on. The user should immediately shut down and check the grid voltage or voltage stabilizer. If the voltage stabilizer automatically cuts off the power (there is input but no output), check whether the mains voltage is higher than 28OV. If it is lower than 280V, check whether the voltage stabilizer is faulty. Use it after finding out the cause.

5. If the output voltage of the voltage stabilizer deviates from 220V by a lot, please adjust the potentiometer on the control board to the normal output voltage (the input voltage cannot be adjusted if it does not reach the voltage stabilization range).

6. When the mains voltage is often at the lower limit (<150V) or upper limit (>260V) of the voltage regulator input voltage, the limit micro switch is often touched, which is prone to control failure. At this time, the voltage regulator cannot adjust the voltage or can only adjust it higher (or lower). You should first check whether the micro switch is damaged.

7. Please keep the machine clean. Dust will hinder the rotation of the gears and affect the output voltage accuracy. Please clean and maintain the coil contact surface in time. When the carbon brush is severely worn, the pressure should be adjusted to avoid sparking between the carbon brush and the coil contact surface. The carbon brush should be replaced when the length is less than 2mm. When the coil plane is burned black, it should be polished with fine sandpaper.

⒏ The input end of the three-phase voltage regulator must be connected to the neutral line (neutral line), otherwise the voltage regulator cannot work normally under load and will damage the voltage regulator and electrical equipment. Do not use the ground wire instead of the neutral wire (but the neutral and ground wires can be connected in parallel), and the neutral wire must not be connected to the fuse.

9. When the output voltage of the voltage stabilizer is lower than the rated voltage (220V or three-phase 380V), check whether the input voltage is too low. When the rated voltage is reached when unloaded and the output is lower than the rated voltage when loaded, this is because the input line load area is too small, or the load end exceeds the rated capacity range of the voltage stabilizer, the line voltage drop is too large when loaded, and the input voltage is lower than the lower limit of the voltage stabilizer adjustment range. At this time, a thicker input wire should be replaced or the product capacity should be increased.

10. When the power of a single load is large (such as air conditioning, etc.), and the input line is long and the load area is insufficient, the voltage is seriously reduced when the load is working, and it may be difficult to start the load; when the load is working and temporarily shuts down, it is easy to cause instantaneous overvoltage and power failure of the output. If such a phenomenon occurs, it is not a voltage stabilizer failure, and the input line should be improved (the line is thickened and the input line length is shortened as much as possible to reduce the voltage drop in the line).

11. When the output voltage of the voltage stabilizer deviates seriously from 220V, you should check whether 

① the input voltage is within the voltage regulation range; 

② whether the motor gear is seriously worn and whether the rotation is flexible; 

③ whether the limit switch is damaged; 

④ whether the coil surface is smooth; ⑤ whether the control board is damaged.