Discussion on special AC stabilized voltage power

Brief discussion on special AC regulated power supply

Abstract: with the social progress and the continuous development of technology, users are also required for the normal use of their own equipment, which requires the increasingly fierce competition in the home appliance industry. AC regulated power supply not only has the function of voltage stabilization, but also has the function of anti-interference and harmonic suppression. In order to meet the needs of the market, the company has recently launched various special power supplies, such as CT machine, NMR-CT machine special regulated power supply Anti interference AC parameter regulated power supply, regulated filter power supply, regulated power supply and other special power supplies

key words: AC regulated power supply anti-interference harmonic discussion on special AC regulated power supply Wenzhou Modern Group Co., Ltd. its predecessor was Wenzhou precision electronic instrument factory founded in 1982, and the group company was established in 1994. It has a history of producing various types of AC regulated power supply for more than 20 years. Compared with the 1980s, the current power supply market and power supply quality have changed a lot. At present, there are two main problems in the AC regulated power supply market and power supply quality: first, low-cost competition is becoming more and more serious; Second, the power supply quality (frequency, waveform, voltage) becomes worse; The main reasons are the widespread use of acrylate building sealant JC 484 (9) 2 for power electronic equipment and the increase of self-contained generating sets due to the contradiction between power supply and demand, which makes the quality of power supply worse and affects the electrical equipment

vvvv with the social progress and the continuous development of technology, users also require that the AC regulated power supply not only has the function of voltage stabilization, but also has the function of anti-interference and harmonic suppression for the normal use of their own equipment. In order to meet the needs of the market, the company recently launched various special power sources, such as CT machine, NMR-CT machine special regulated power supply, anti-interference AC parameter regulated power supply, regulated filter power supply Voltage regulation power supply and other special power supply

vvv1, anti-interference AC parameter regulated power supply

vvvv AC parameter regulated power supply is also known as constant voltage transformer (CVT). Its basic principle is a functional converter made of ferromagnetic resonance principle. Linear inductance coil, saturated inductance coil and compensation inductance coil are installed in a special structure iron core to realize their respective functions. The primary iron core will be used in the linear segment of the magnetization curve of the iron core, while the secondary iron core uses the shallow saturation region of the magnetic characteristics. When the input voltage rises again, its magnetic field will not affect the saturated iron core, so as to achieve the purpose of voltage stabilization. This kind of power supply has unique and simple structure, excellent stability and reliability, and wide voltage stabilization range. When the input voltage changes by ± 20% and the output voltage changes by ± 3%, the overload protection is based on relatively low requirements for the base course and construction tools, and has strong capacity; When the load is short circuited, the output voltage will automatically drop to ensure the safety of the equipment, and the input and output are safely isolated. There is no direct electrical connection, and there is shielding and absorption function. It has a good bidirectional suppression and attenuation effect on the pulse interference signal from hundreds of Hz to tens of thousands of Hz, and the common mode suppression is ≥ 50dB. In addition, one of the very important features is that the effect of restraining electric harmonics is obvious, the voltage waveform is significantly improved, the third harmonic reduction rate reaches more than 90%, and the odd and even harmonics such as 5, 6, 7, 8 and 11 are significantly improved. Therefore, it is especially suitable for the supporting power supply of various instruments and equipment in the line with serious harmonic pollution, and the power transformer of the control system in precision equipment can also be used

vvvv with the improvement of technology and process level, the noise level of the whole machine is greatly reduced. In the past, the use was affected by the high noise of CVT, so it can be used safely at present

vvvv2, a new AC power supply that stabilizes voltage and suppresses harmonics

vvvvv at present, the harmonic suppression of electricity has become a very important task for the power supply department. In recent years, with the development of power electronics technology, active power filter has become the most promising filtering method to solve the voltage distortion of power. Using the series active power filter method, a new type of power supply has been developed to stabilize voltage and suppress harmonics, which is called series power quality controller (SPQC), similar to the foreign name voltage dynamic restorer. This product can not only stabilize voltage but also suppress electric harmonics, so it can also be called voltage stabilizing filter. 7.2.1 factory inspection items include size deviation, appearance quality, color, compressive strength and flexural strength. This voltage regulator can also dynamically compensate the flicker, drop, surge, peak, etc. of three-phase unbalanced voltage. When the mains voltage is unstable and has harmonic pollution, after the instantaneous dynamic voltage compensation of the instrument, a pure three-phase sinusoidal balanced voltage is obtained on the load

vvvv a voltage stabilizing filter with three matching load capacity of 15KVA, when the input voltage is 170 ~ 210v, the total distortion rate of voltage harmonics is 8.8%, with inductive motor and switching power supply load, the output voltage is between 219 ~ 224, the total distortion rate of voltage harmonics is reduced to 2.8%, and the output waveform is significantly improved

vvvv this kind of power supply is undoubtedly the best choice for precision instruments in petroleum geological exploration, signal light power supply at stations along the electrified railway and precision instruments in areas with poor power quality

vvvv3, medical power supply

vvvv the CT machine of the medical system has been widely used in various hospitals. If the power supply is improperly configured, the resolution of CT film will be poor, which will make it difficult for doctors to diagnose, and may also make the disease wrong. The CT machine itself uses the power supply characteristics: first, when the focus is exposed, the output current of the regulated power supply is required to be large and the voltage drop is small, so it is not adjusted at this moment; 2、 CT itself has rectification circuit electrically, which produces harmonics, sometimes affecting the action control of regulated power supply. According to the experience of supporting power supply for ge-ct for more than ten years, reduce the internal resistance in the regulated power supply, increase the harmonic filtering device in the output, add the locking function and surge absorption circuit in the control circuit, and take a series of measures to design a special medical power supply to meet the needs of users

vvv4. AC voltage regulating and stabilizing power supply

vvvv in recent years, the market demand has gradually increased, and most of them require relatively large capacity. This kind of product integrating voltage regulating and stabilizing functions is "voltage regulating and stabilizing power supply" or adjustable and stable voltage regulator. The products include induction, power electronics, transformer and other types of voltage regulating and stabilized power supplies. Each type has its own characteristics and shortcomings, which are not described here. The closed-loop column voltage regulator is composed of multi-stage voltage regulation and column compensated AC regulator, which can maintain the stability of output voltage while regulating voltage. This voltage regulator has developed rapidly in recent years, with a capacity range of 30KVA ~ 200KVA. Compared with the induction type, it has no fixed rotation and air gap, small no-load current and no-load loss, undistorted waveform (waveform distortion 0.5%), fast voltage regulation speed, strong instantaneous overload capacity, and has been widely used

vvvv with load capacity