Principle of voltage stabilizerWith the continuous improvement of living conditions, more electricity is used at home now, and I am afraid that it will not be able to withstand frequent trips, so every home needs to install a voltage stabilizer. This will not cause damage to home appliances, so what is the working principle of the voltage stabilizer? I think everyone does not understand this, how should we choose a suitable voltage stabilizer? Now let's take a look.A voltage stabilizer is a device that stabilizes the output voltage. The voltage stabilizer is composed of a voltage regulating circuit, a control circuit, and a servo motor. When the input voltage or load changes, the control circuit performs sampling, comparison and amplification, and then drives the servo motor to rotate, so that the position of the carbon brush of the voltage regulator changes, and the coil turns ratio is automatically adjusted to maintain the stability of the output voltage.How the voltage stabilizer worksSince some electrical appliances contain coil components, eddy currents that hinder the current will be generated at the initial stage of power-on. The generation of eddy currents will not only weaken the instantaneous voltage when the electrical appliances are started, resulting in slow startup, but also strengthen the instantaneous voltage generated after the circuit is broken, which may cause spark damage. circuit. At this point, a voltage stabilizer is needed to protect the normal operation of the circuit.The voltage stabilizer is composed of a voltage regulator circuit, a control circuit, and a servo motor. When the input voltage or load changes, the control circuit performs sampling, comparison, and amplification, and then drives the servo motor to rotate, so that the position of the voltage regulator carbon brush changes. The coil turns ratio is automatically adjusted to keep the output voltage stable. The voltage stabilizer with larger capacity also works on the principle of voltage compensation.The role of voltage stabilizer1. Protecting precision instruments with high voltage requirements;2. The experimental equipment (assay equipment) j of the laboratory (laboratory) with a higher standard is equipped with a voltage stabilizer to ensure the precision level (accuracy) of the experimental (assay) data; 3. Key equipment in hospitals, national defense, factories, schools, finance and other departments are equipped with voltage stabilizers to ensure the stability and safety of equipment operation. In short, key departments in various industries apply voltage stabilizers to their key electrical equipment.Safety precautions for voltage stabilizer⒈ When the regulated power supply is powered on, please do not disassemble the regulated power supply or pull the input and output wiring of the regulated power supply at will to prevent electric shock or other electrical safety accidents.⒉ The input and output wiring of the regulated power supply must be arranged reasonably to prevent the trampling and abrasion, resulting in leakage accidents.3. The regulated power supply must be grounded reliably. The user is responsible for the electric shock or personal injury caused by the operation of the ungrounded wire.⒋The ground wire of the regulated power supply cannot be connected to public facilities such as heating pipes, water supply pipes, gas pipes, etc., so as not to infringe the rights of third parties or cause harm.⒌The input and output wiring of the regulated power supply should be checked regularly to avoid loosening or falling off, thus affecting the normal use of the regulated power supply and the safety of electricity consumption.⒍The selection of the cable of the voltage stabilizer must meet the requirements of the cable that can carry enough current capacity.⒎The voltage stabilizer should be handled with care and avoid violent vibration during work.⒏Ensure that the carbon brush spring of the voltage stabilizer has enough pressure to avoid flashover between the carbon brush and the coil contact surface.⒐Non-professionals, please do not disassemble the regulated power supply or repair the regulated power supply.How to choose a voltage stabilizer1. It can stabilize the voltage of low voltage 125V-165V or high voltage 250V-270V between 200-230V, so that household appliances can work normally;2. When the input voltage is higher than 255-275V or lower than 125-160V, the power supply can be automatically cut off;3. When there is a sudden call after a power failure, the output power can be started after a delay of 5-8 minutes to avoid damage to the electrical appliance due to excessive voltage. When purchasing a home voltage stabilizer, you must pay attention to whether the above three basic functions are complete or not.

There are two types of voltage regulators: linear and switching.Linear regulators use active (BJT or MOSFET) current-passing devices (series or parallel) controlled by a high gain differential amplifier. It compares the output voltage to a precision voltage reference and adjusts the pass device to maintain a constant output voltage.A switching regulator converts a DC input voltage to a switching voltage that is applied to a power MOSFET or BJT switch. The filtered power switch output voltage is fed back to a circuit that controls when the power switch is turned on and off, so that the output voltage remains constant regardless of changes in its input voltage or load current.2 What are the topologies of switching regulators?There are three common topologies: buck, boost, and buck/boost. Other topologies include flyback, SEPIC, Cuk, push-pull, forward, full-bridge and half-bridge topologies.3 How does the switching frequency affect the regulator design?Higher switching frequencies mean that regulators can use smaller inductors and capacitors. It also means higher switching losses and greater circuit noise.4 What are the losses of switching regulators?The power required to turn the MOSFET on and off causes losses and is associated with the MOSFET gate driver. Likewise, switching from a conducting state to a non-conducting state takes a certain amount of time, and therefore generates MOSFET power dissipation. In addition, the energy required to charge and discharge the MOSFET gate capacitance between the threshold voltage and gate voltage also causes losses.5 What are the common applications of linear and switching regulators?For a given input and output voltage, the power dissipation of a linear regulator is proportional to the output current, so typical efficiency can be 50% or less. By optimizing the device, switching regulators can achieve 90% efficiency. However, the noise output of a linear regulator is much lower than that of a switching regulator for the same output voltage and current requirements. Typically, switching regulators can drive higher current loads than linear regulators.6 How does a switching regulator control its output?A switching regulator needs to change its output voltage in some way in response to input and output voltage changes. One approach is to use PWM to control the input of the associated power switch, thereby controlling its switching time (duty cycle). During operation, the filtered output voltage of the regulator is fed back to the PWM controller to control the duty cycle. If the filtered output changes, feedback applied to the PWM controller changes the duty cycle to maintain a constant output voltage.7 Which design specifications are important for a regulator IC?The basic parameters include input voltage, output voltage and output current. Depending on the application, other parameters may also be important, such as output ripple voltage, load transient response, output noise, and efficiency. Important parameters of linear regulators include dropout, PSRR(power supply rejection ratio) and output noise.

NO1 powerThe power of the voltage stabilizer can be purchased according to the sum of the equipment power equipment.NO2 pay attention to the voltageIt is clear whether it is three-phase 380V or single-phase 220VNO3 regulated power supply pricePrice has always been a concern of customers. Factors such as different brands and different powers affect the price. You can choose a certain price range according to the comparison.NO4 regulated power supply qualityBrand effect, choose a power supply manufacturer with high credibility, logistics and after-sales service are more secure and reliable.NO5 shop aroundWhen choosing a 3 phase voltage stabilizer, you can shop around, and then decide what to buy. After all, for electrical equipment used in the power grid, we seek quality and assurance.What is a voltage stabilizerA voltage regulator is a device that stabilizes the output voltage. The voltage stabilizer 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, and then drives the servo motor to rotate, so that the position of the carbon brush of the voltage regulator changes, and the coil turns ratio is automatically adjusted to maintain the stability of the output voltage.The role of the voltage stabilizerA voltage stabilizer is a power supply circuit or power supply 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 that various circuits or electrical equipment can be stabilized. The equipment can work normally under the rated working voltage.The original power regulators relied on the beating of relays to stabilize the voltage. When the grid voltage fluctuates, the automatic correction circuit of the power regulator is activated to make the internal relay operate. Forcing the output voltage to remain near the set value, the advantage of this circuit is that the circuit is simple, but the disadvantage is that the voltage regulation accuracy is not high, and every time the relay jumps and shifts, it will cause an instantaneous interruption of the power supply and spark interference. This greatly interferes with the reading and writing work of computer equipment, and it is easy to cause error signals in the computer, and in severe cases, the hard disk will be damaged. Most of the high-quality small voltage stabilizers use the method of motor-driven carbon brush to stabilize the voltage. This voltage stabilizer has little interference to electrical equipment and has relatively high voltage stabilization accuracy.The working principle of the voltage stabilizerThe voltage regulator consists of a voltage regulator circuit, a control circuit, and a servo motor. When the input voltage or load changes, the control circuit performs sampling, comparison, and amplification, and then drives the servo motor to rotate, so that the position of the voltage regulator carbon brush changes. By automatically adjusting the coil turns ratio, the output voltage is kept stable. The voltage stabilizer with larger capacity also works on the principle of voltage compensation.

Generally, the input voltage of the conventional 3 phase voltage stabilizer is plus or minus 20%, which is 304-450V. But some voltage regulator manufacturers produce a lot of 15% is 323-430V. If the local voltage is particularly low, the minimum input can be 176V-430. Output 380V.Reasons for abnormal output voltage:⒈ If it is a coherent voltage stabilizer, replace the sub-adjusting voltage stabilizer.⒉ If it exceeds the voltage regulator range of the regulator itself, replace the wide range regulator.⒊The travel limit switch is broken and needs to be replaced.⒋The phase circuit board is damaged and needs to be replaced.⒌The servo motor is burnt out and needs to be replaced.Factors affecting the price of 3 phase voltage stabilizerThe first point: the production process of 3 phase voltage stabilizer. Most manufacturers of 3 phase voltage stabilizer will have different production processes and different product quality. For example, some are guaranteed for one year, and some are guaranteed for three years. different.The second point: material, 3 phase voltage stabilizer is not composed of a single individual, its main components are: transformer, control switch, execution structure, auxiliary material composition. And these materials also lead to differences in their structure. It is not unheard of in the market to replace copper with aluminum, so its price is also diverse.The third point: the capacity required by the buyer, its capacity is different, the price will also be different. If only a vague concept is given to the voltage stabilizer manufacturers, the capacity calculated by the voltage stabilizer manufacturers according to their requirements may be different, so the price will also be very different.The fourth point: brand influence, for brand products, the price may be much more expensive than that of non-brand companies with the same cost performance, so the reasonable price of a 3 phase voltage stabilizer is related to its brand.

AVR adopts digital (DAVR), its performance is reliable, and has hard interface with ASS, DEH and DCS and communication interface with DCS. It has two redundant main controllers A and B, which receive signals from different PT and CT secondary sides respectively. The output signals are amplified by pulse amplifiers A and B respectively to form trigger pulses to control the thyristor rectifier. When the working system fails, it will automatically switch to the backup system.With two independent automatic channels. Each automatic channel has a rotor current closed loop function. The two automatic channels are used as backup for each other, and can automatically switch without disturbance in case of failure. Each channel is provided with an independent standby manual channel and meets the generator test requirements.In addition to the more complete control functions, the excitation control system also includes:There are two ways of automatic start and manual start;With self-diagnosis function for hardware and software, it can detect abnormal conditions in time and provide processing steps;It has the function of recording the transition state to provide the purpose of failure analysis and test analysis. The main controller has the function of periodically and cyclically recording control parameters, including at least 32 points of fault signal (or digital input) and 8 points of analog input (such as generator voltage, active power, reactive power and excitation current, etc.) , and the recorded items can be modified.During normal operation, the parameters are recorded all the time. The built-in display screen can easily display the test parameters and dynamic characteristics, and the recorded parameters can also be sent to the special maintenance tool through the communication interface to display the trend in a graphic way.AVR has at least the following limited protection functions:- Forced inverse time limit;- Overexcitation limit and protection;- Underexcitation limit and protection;- Maximum excitation current limit and protection;- VT disconnection protection;- V/H limit and protection, etc.;- Power System Stabilizer (PSS) (response frequency from 0.1~2Hz).AVR has the following basic functions: terminal voltage regulation, magnetic field voltage regulation, constant reactive power regulation, constant power factor regulation, reactive power compensation, etc.The AVR has an analog measurement port for the output signal of the regulator and an analog signal input port for the voltage addition point, so as to measure and set the AVR characteristic parameters. AVR has analog quantity measurement port of PSS output signal and analog quantity signal input port of PSS input point, in order to measure and set PSS characteristic.AVR meets the requirements of anti-electromagnetic interference test in GB/T17626 electromagnetic compatibility test and measurement technology. The AVR cabinet uses natural ventilation and is equipped with a cooling fan. The protective grounding and working grounding of the cabinet are separated. The protection class of the AVR cabinet is IP31. The AVR cabinet can operate normally when the ambient temperature is 45 degrees.The AVR adopts the DC regulated power supply of the device itself. The DC regulated power supply device itself is reliable and requires two independent external power supplies to run in parallel.

An automatic voltage regulator, commonly referred to as an AVR, is essentially a solid state electronic device used in diesel generators. The AVR is designed to facilitate automatic maintenance of the generator output voltage at a preset value, especially when the generator load changes or the generator operating temperature changes. Simply put, the AVR can be said to be an integral part of the alternator excitation system.Do you know? It is generally the alternator manufacturer that provides the automatic voltage regulator! After all, an AVR is essentially part of an alternator. Here, the model of AVR that comes with the alternator depends heavily on the type and the accessories mounted on the alternator.AVR placement in diesel generatorsGenerally speaking, automatic voltage regulators can be found in any of the places mentioned below -In the generator main control boxIn the alternator junction boxUnder the back cover of the alternator (usually in the case of small portable generator sets)How does the diesel generator AVR work?The main function of AVR is to control the generator output voltage. It does this by first detecting the voltage from the generator terminals and then comparing it to a preset stable reference to check for an error signal (if any). If there is a difference between the two, the ACR adjusts the field current by increasing or decreasing the current flowing to the exciter stator. This in turn ensures a lower or higher voltage at the main stator terminals.As you probably know by now, the AVR acts as a regulating device, ensuring that the generator's voltage output remains within a predefined range. Thus, it ensures that the generator voltage never drops to the point where it causes any connected electrical equipment or electrical equipment to fail. It also helps keep the generator safe from a low battery.Adjustment of the generator output becomes critical when the rpm of the generator changes - this mainly happens when the rpm of the generator engine changes, because the generator-to-engine gear ratio is fixed. A stable voltage during this time ensures the safe operation of both - the electrical equipment that powers it, as well as the generator battery.Types of Automatic Voltage RegulatorsAccording to the working principle and application, AVR can be roughly divided into the following categoriesContact type automatic voltage regulatorIn this type of AVR, the voltage regulator contacts vibrate relatively slowly, resulting in low voltage regulation accuracy. It is for this reason, and the relatively short service life, that contact AVRs are no longer used in generators.Transistor automatic voltage regulatorTransistor AVRs were developed with the development of semiconductor technology. This type of voltage stabilizer has the characteristics of high triode switching frequency, high adjustment accuracy, high reliability, and low radio interference.IC automatic voltage regulatorIC regulators, also known as integrated circuit regulators, have all the advantages of transistor regulators. In addition to this, it has the benefit of an ultra-small size, which reduces the need for any external wiring, which enhances its cooling.Computer controlled automatic voltage regulatorAs the name suggests, a computer-controlled regulator is primarily dependent on the total load current of the system in communication with the generator computer. Here, the engine computer ensures that the magnetic field circuit is opened and closed in time according to the set value, so that the electrical system operates normally.As AVR is an important part of diesel generators, it is highly recommended that you source from a reputable diesel generator manufacturer, this will ensure that you have accurate details about the part and can be assured of It is maintained and maintained.Frequently Asked Questions about Automatic Voltage Regulator (AVR)Does the AVR have a different design?While most AVRs look similar, sometimes they can vary in size and color. That said, all AVRs have surprisingly similar characteristics, so there's not much difference in functionality.What happens if the generator AVR fails?When the AVR of the generator fails, the generator will inevitably lose its excitation, resulting in a sharp drop in voltage. This could eventually cause the generator to shut down due to an undervoltage fault. If the generator is not equipped with undervoltage protection, it may continue to operate even after a drop, causing serious damage to the equipment.

What is an isolation transformer? An isolation transformer refers to a transformer with electrical isolation between the input winding and the output winding. The isolation transformer is used to avoid accidental contact with live objects at the same time. The isolation of the transformer is to isolate the respective currents of the primary and secondary windings. In the early days, it was used in the power industry in European countries, and it was widely used in the electronics industry or industrial and mining enterprises, machine tools and mechanical equipment in general circuit control power supplies, safety lighting and indicator lights. 2. Why use isolation transformers must first understand my country’s power supply system. When supplying low-voltage users, my country’s power supply system generally adopts a three-phase system. Live wire), the other is the neutral wire, which is at the same position as the earth. When the human body touches the hot bottom plate, it will cause current to pass through the human body and form a loop with the earth, causing electric shock hazards. If you use an isolation transformer, it will be safer, because the primary and secondary exchange energy through a magnetic field, and there is no physical hard connection. Low potential, will not cause electric shock hazard. 3. The role of the isolation transformer The main role of the isolation transformer is to completely insulate the electrical on the primary side and the secondary side, and also isolate the circuit. In addition, the high-frequency loss of its iron core is used to prevent high-frequency clutter from entering the control loop. Using an isolation transformer to suspend the secondary to the ground can only be used in occasions where the power supply range is small and the line is short. At this time, the capacitance current of the system to ground is too small to cause personal injury. Another very important role is to protect personal safety and isolate dangerous voltages.

The first step: power connection. Connect the regulated power supply to the electricity supply. Step 2: Turn on the power. When the load is not connected, press the main power switch, and then turn on the DC output switch of the power supply to make the power output work normally (some simple adjustable regulated power supplies have only the main power switch and no independent DC output switch). At this time, the current working voltage and output current are displayed on the digital indicator of the power supply. Step 3: Set the output voltage. By adjusting the voltage setting knob, the digital voltmeter displays the target voltage, and the voltage setting is completed. For the power supply with adjustable current limiting function, there are two sets of adjustment systems to adjust the voltage and current respectively. It must be clearly distinguished when adjusting. Generally, the potentiometer for adjusting the voltage has the word "VOLTAGE", and the potentiometer for adjusting the current has the word "CURRENT". Many entry-level products use low-cost coarse/fine dual-knob settings. In the case of dual-adjustment knobs, we first turn the fine-adjustment knob to the middle position, then set the approximate voltage through the coarse-adjustment knob, and then use the fine-adjustment knob. Accurate correction. Step 4: Set the current. Press the "Limit" button on the power panel and hold it down. At this time, the ammeter will display the current value.Adjust the current knob to make the current value reach a predetermined level. Generally, the current limit can be set at 120% of the commonly used maximum current. Some power supplies do not have a dedicated adjustment key for current limiting. The user needs to short-circuit the output terminal according to the requirements of the manual, and then set the current-limiting level according to the short-circuit current with the current-limiting knob. The simple adjustable regulated power supply has no current setting function and no corresponding knob. Step 5: Set OVP for overvoltage protection. Overvoltage setting refers to further limiting an upper limit voltage within the adjustable voltage range of the power supply itself, so as to prevent the power supply from outputting excessively high voltage during misoperation. Generally, the overvoltage can be set to the level of 120% of the usual maximum working voltage. Overvoltage setting requires a flat-blade screwdriver to adjust the potentiometer recessed in the panel, which is also a design to prevent misoperation. When setting the OVP voltage, first adjust the operating voltage of the power supply to the target overvoltage point, and then slowly adjust the OVP potentiometer to make the power supply protection act exactly, and the OVP setting is now complete. Then, turn off the power, lower the operating voltage, and it will work normally. To set the working voltage, refer to the third step above. Different power settings have different OVP methods. The sixth step: communication interface parameter setting and remote control operation setting. For local control applications (panel operation), turn off the remote control operation. The communication interface should be set according to the communication requirements, and the local application does not need to be set. For the use of the regulated DC power supply, I will share with you here. The regulated DC power supply adopts the IGBT module adjustment mode. The specific characteristics of high efficiency, high precision and high stability are mainly used in scientific research institutions, laboratories and electronic products. It is used when high-efficiency power supply is required for testing.

The voltage regulator is the fourteenth batch of energy-saving products in the electromechanical industry. The contact voltage regulator is essentially an autotransformer whose output voltage can be adjusted. Voltage regulators with different capacities have different coil DC resistances, but they are usually very small. 0.4 Euro cannot be used as a basis for judging whether it is burned out. It has a wide range of applications, and is generally used in places such as voltage regulation, temperature control, speed regulation, dimming, and power control.1. The carbon brush of the voltage regulator must ensure a certain thickness;2. The carbon brush has already touched another turn of the coil before the carbon brush has completely removed the turn of the coil that has been in contact;3. At least two turns must be bridged during movement;4. There is always a short circuit between turns during the operation of the voltage regulator. The thicker the thickness of the carbon brush, the more short-circuit turns. Therefore, the thickness of the carbon brush of the voltage regulator varies according to the diameter of the voltage regulator;5. Because the short-circuit between turns will cause short-circuit circulating current, it is necessary to control its size, so the turn voltage of the voltage regulator is generally below 1V. Common high-power voltage regulators have a turn voltage of 0.8-0.9V, and low-power is even smaller, generally ranging from 0.4-0.7V. If the turn voltage is too high, the stability of the voltage regulator will be poorer and it will easily burn out.

Which brand of 220V voltage regulator is good?Shenzhen SST Power Company Limited has a good brand, a well-known domestic brand, stable quality, worry free after-sales, and more than ten years of production technology experience.Shenzhen SST Power Company Limited produces 220V contactless voltage regulator. The advantages of contactless voltage regulator are: no noise, no contact, no mechanical wear, zero maintenance, long service life, LCD display working voltage, clear at a glance, real-time monitoring of working status, voltage stabilization accuracy of up to 1%, voltage stabilization speed of up to 40 milliseconds. This is a high-end voltage regulator with high cost performance. It is suitable for household voltage stabilization, air conditioning, computers, generators, lighting and other electrical equipment that need voltage stabilization.1、 Product introductionSingle phase intelligent contactless voltage regulator is a high-end product developed and produced by our company. Intelligent contactless voltage regulator uses integrated circuit to control several thyristor voltage zero crossing on-off in a specific order to change the size and polarity of compensation voltage. It is the perfect combination of thyristor AC switching technology and transformer technology. Using thyristor (thyristor) instead of machinery and carbon brush to control voltage regulation is an advanced product leading the development direction of high-power power power regulator. It is an energy-saving green environmental protection product with all protection functions, very reliable operation and strong adaptability. It has the advantages of good stability, high efficiency and high precisionPerformance characteristics● CPU intelligent control, digital circuit, stable and reliable● large screen LCD display and humanized man-machine operation interface● no contact, no wear, maintenance free and long service life● the voltage stabilization speed is as fast as 20ms, and can be connected to various types of generators and household appliances● efficiency up to 98%, power consumption ≤ 1%, power saving and money saving● strong anti-interference and purification ability, making the output power completely pure● it has overvoltage, undervoltage, short circuit, phase loss and automatic bypass protection functions; Optional RS232 and RS485 communication ports can realize remote communication monitoring of voltage regulator.● CPU intelligent control, digital circuit, stable and reliable● large screen LCD display and humanized man-machine operation interface● no contact, no wear, maintenance free and long service life● the voltage stabilization speed is as fast as 20ms, and can be connected to various types of generators and household appliances● efficiency up to 98%, power consumption ≤ 1%, power saving and money saving● strong anti-interference and purification ability, making the output power completely pure● it has overvoltage, undervoltage, short circuit, phase loss and automatic bypass protection functions; Optional RS232 and RS485 communication ports can realize remote communication monitoring of voltage regulator.