霓虹燈電子變壓器電路（Electronic transformer circuit for neon lamp）VIP

1、霓虹燈電子變壓器電路（Electronic transformer circuit for neon lamp）Electronic transformer circuit for neon lamp6-28Neon light is a low voltage cold cathode glow discharge light source. It is characterized by high starting voltage, working voltage and small working current. Previously, in various neon light pro

2、jects and devices, the problem was solved by using an iron core magnetic leakage transformer to match the neon tube. It has the advantage of higher reliability and durability. Disadvantages are large size, power consumption, low power factor, power frequency noise, not easy to multi-function display

3、 control.After the worldwide energy crisis in 1970s, many companies devoted themselves to the research of new energy-saving light sources (such as fluorescent lamps, AC electronic ballasts, neon lights, electronic transformers, etc.). With the rapid development of semiconductor technology, many kind

4、s of high reverse voltage and high current power devices used as switch tubes are emerging, which provide a prerequisite for the development of electronic transformer for neon lamps. The research and production of electronic transformer for neon lamp started in the middle and late 1980s. At that tim

5、e, the electronic transformer of neon lamp was the first generation, and they had the following shortcomings:1, the output power is insufficient: with the electronic transformer neon lamp brightness is dim, the length of the load tube is limited, the density of the lamp is low, can not meet the dema

6、nd of large neon lamp billboard.2, display uneven brightness: because of constant flow characteristics difference.3, process structure is poor: only made appropriate waterproof moisture-proof treatment, mainly for indoor occasions, lack of tightness, resulting in not open use.4, electromagnetic inte

7、rference is too large: can not meet the requirements of E, M, C.Improvement of electronic transformer for neon lampIn late 1990s, commercial advertising neon lamp market further prosperity, market demand stronger growth, further improve the production technology of neon lamps, neon lamp project cons

8、truction experience has been summarized and improved, and application of switching power supply technology is more mature, quality and cheap electronic components continue to emerge, prompting more research and development. And improve the electronic transformer for a neon lamp, in which the key tec

9、hnology (high voltage insulation, heat dissipation, electromagnetic shielding and waterproof) make improvements, improve circuit reliability, prolong its service life, improved neon electronic transformer following performance improved;A, for the neon lamp for the start and normal operation of the v

10、oltage and current required.B, with perfect protection function, such as open circuit (overload) protection, short circuit protection, overheat (overcurrent) protection, etc.C, comply with the relevant security certification: such as UL certification, CE certification, etc.D, with moisture-proof, we

11、t and prevent rain and dust protection functions.At present, the voltage feedback type half bridge inverter is adopted in the neon lamp electronic transformer.Two and second generation of neon electronic transformerIn addition to advertising lighting, neon lights are widely used in buildings (such a

12、s buildings, roads and bridges), night lighting, artistic decorations, signal signs and stage lighting. The development of semiconductor electronic technology, the use of new materials, such as three primary color fluorescent powder, neon electronic transformers have also been further promoted. Broa

13、d prospects for the market guide more enterprises to invest more manpower and resources to study and improve the performance of the electronic transformer of neon lamp, especially the improvement of computer control technology, such as the application of colorful gradient scanning technology, which

14、matched with the qualitative leap in the performance of electronic transformer:Reduce the starting or closing inrush current. Use soft switch (zero voltage / current switch, ZVS / ZCS) technology, APFC technology and so on.At present, the development direction of the neon light electronic transforme

15、r is miniaturization, light weight and high efficiency. High power, large output current and high power factor. The following are popular in the market:1 、 communication sense series:Regular type, mainly output, adapted to advertising signs, etc.Second, a small machine load length of about 0.1-3m, 0

16、.1-1m, 0.1-2m and O.1-3m three, suitable for advertising light boxes and urban lighting, lighting and other color change control.2 、 AC non sense series: output DC pulsating high voltage, can solve the problem of uneven brightness, but the mercury filled tube has polarization phenomenon, now gradual

17、ly reduce the use.3, AC / super bright highlight series: (with 15mm or 20mm with neon neon load):The output of the 10KV / 40mA (phi 20, neon tube) mainly used for commercial advertising and city lighting, neon lamp project outline.4 、 DC (low voltage) series: input is DCl2V + 10% and DC24V + 10%, wh

18、ich is more suitable for interior decoration craft lamp.5, multi-function: through the improvement of neon light, electronic transformer control circuit can be increasedIt has many functions, such as acousto optic control, self flashing, dimming and writing, etc. it can also realize the functions of

19、 color change and rolling.Three 、 brief introduction to new type of neon lamp electronic transformerThe circuit design of A and small neon light electronic transformer is made from the following aspects:1, do not receive the lamp, load does not start, or stop vibration, automatic shutdown.2 、 short

20、circuit automatic protection, power consumption is only about 1.5w. .3, according to the length of the load tube automatically adjust power, overload to reduce output current, to achieve protection function, so it has the following advantages in installation and use:Low price, small size, low output

21、 voltage, short connection lead, little electromagnetic interference to the environment.Reduce the requirement of insulation, reduce the occurrence of dangerous accidents such as high voltage ignition, and improve safety.A plurality of small computers can be used in combination to increase the densi

22、ty of the lamp tube and avoid the phenomenon that both ends are bright and dark at the time of high frequency and high voltage use.The utility model is more convenient for controlling colorful, gradual change scanning, etc., so the utility model is more suitable for the occasions of lighting, guardr

23、ail, color change, advertisement outline, etc. in the urban lighting project.B, AC highlight / super highlight series is characterized by high power, large output current and high power factorThe circuit design increases the power factor improving circuit, harmonic circuit and anti electromagnetic i

24、nterference (EMI) measures to reduce the pollution to the grid, to suppress the surge from the grid, according to the rectifier circuit has no DC capacitor large divided into two types;There is a large electrolytic capacitor in the power circuit. When the switch is on or off, the inrush current is l

25、arge, the scanning control may not be synchronous, and the service life is limited.In the power circuit, when there is no electrolytic capacitor, when the switch is on or off, the impact current is small, the number of power is very high (more than 0.95), the constant current characteristic is good,

26、 and the utility model is suitable for occasions such as color gradient scanning, etc.Four, the actual design, making several improvementsL, to improve its frequency, using bipolar transistor, switching frequency up to several tens of kHz, if using MOSEET, it can reach hundreds of kHz, one can reduc

27、e the use of energy storage components such as capacitor, inductor or transformer volume, on the other hand can improve the luminous efficiency of neon lights.2, the use of composite circuit, two or three triode parallel use, more than only energy storage components and used to increase its power, i

28、ncrease its output current, improve its power factor. Such as 10 meters super bright machine, input power 150W / 230W, output current 40mA / 60mA, power factor 0.955;3. The whole neon light electronic transformer is covered with all epoxy resin. It can be waterproof after vacuum and baking. It is su

29、itable for indoor and outdoor use;4, selection of electronic components, minimize the elements to consider when designing a margin, such as filter capacitor with series 2 pressure 250V, with 105 degrees finished by enough time after aging screening, so as to improve the reliability and the service l

30、ife of it;5, select the LAYQUT PCB advanced technology, using computer aided design and Simulation of control, the simplest structure and its best working condition, is added in the circuit EMI filter circuit, removing harmonic circuit and shielding earthing device, effectively reducing electromagne

31、tic interference;6, improve the protection function, improve its durability, safety;7. To improve the heat dissipation design, add heat sink and cooling plate,The encapsulating material and filling material with good thermal conductivity were used to improve the sealing process and to improve its he

32、at resistance;8, the use of new materials, such as flame retardant materials, silicon rubber magnets, power lines, new model capacitor model, power switch device, in order to adapt to the different environment temperature and area:9, the introduction of new technologies, new processes, such as the use of lead-free welding technology to reduce environmental pollution;10, the introduction and formulation of new standards; will be related to technical