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  • Discussion on Misunderstandings in Purchasing Switching Power Supply and Survival Problems Faced by Power Supply Enterprises
    Some fatal errors in purchasing switching power supplies: First, desperately push the price down as low as possible, manufacturers do low-cost power, the cost will inevitably lead to quality can not be guaranteed. Second, more than one year or even three to five years of warranty or replacement is not established, the manufacturer of brand power only provides a one-year warranty Third, the warranty of 2 years or more is not established at all. It may not be known that small workshops will be closed after 2 years. There is no guarantee for late maintenance. It is estimated that many people understand. Fourth, different product quality, will inevitably lead to different costs, quality to do the best, the price and sell the cheapest, the two are difficult to coexist, ask, how can fish and bear's paw can have it? 5. In today's ever-changing environment of electronic products, technology has not determined the existence of the cost of the product itself as a problem. Then, how can the products produced under the same technology be less costly? For this reason, many manufacturers obtain The short-term economic benefits have sacrificed the quality of the products themselves. Among them, the selection of inferior ones and the renewal of originals have led to a reduction in the number of manufacturers. Therefore, it is necessary for purchasers to carefully identify these products while understanding the production process of the products and the selection of raw materials. Whether formal, etc., must not blindly pursue the low price and ignore the quality of the product itself. From my point of view, those enterprises that have obtained short-term benefits at the expense of product quality will inevitably be unable to embark on a path of sustainable development, and will inevitably be gradually wiped out and dying in the tide of the times. The carrier disappeared without a trace. If you want to continue development for a long time, only product quality will be regarded as the life of the company, will meet customer needs, to achieve customer satisfaction as their own responsibilities, in order to remain invincible in the industry, and thus more long-term walk!

    2018 10/15

  • Power adapter disassembly method and maintenance steps
    Since the reform and opening up, the popularity of electrical equipment, many jobs in the society are inseparable from the computer, like Xiaobian, Xiaobian can now write articles here because of the existence of computers, laptops are the equipment often used by Xiaobian. But once there is no electricity, it will not work properly. At this time, the power adapter will be used. The power adapter plays a key role in our life. If the device suddenly breaks down, what should I do? Is it directly lost and re-purchased? Here we will talk about how to remove the power adapter, as well as the steps and maintenance steps of the power adapter. How to remove the power adapter How to remove the power adapter, the power adapter is opened four steps 1. The upper and lower covers of the power adapter are injection molded or glued with super glue. Without any screws, they can only be cracked by violence. However, as long as the method is correct, the disassembled power adapter can be completely restored, and there is almost no visible trace without careful observation. 2. Place the lateral side of the power adapter on the white paper, cut it with the electric knife blade along the gap between the upper and lower covers of the power adapter, and then tap the back of the electric knife with a hammer to cut the electric knife between the upper and lower covers of the adapter. At different positions of the gap between the upper and lower covers of the adapter, use the tip of the electrician knife to move along the slit. When a certain part of the upper and lower covers is first cracked, the tip of the blade is deepened, and then the upper and lower covers of the adapter are slowly separated. 3, then open the power adapter of the shell, you can see the copper shield on the outside of the adapter circuit, use the utility knife to cut the tape on the shield, and then use the soldering iron to open the shield and the internal circuit board With a solder joint, the shield can be removed. 4. There is a thick layer of hard plastic film between the shielding layer and the circuit board. After cutting it with a utility knife, it will be fine. After these four steps are completed, you can repair the power adapter. I hope that you can understand how to remove the power adapter through the introduction of this article, and then apply it in practice. Detailed steps for removing the power adapter Demolition power adapter introduction The power adapter is constructed with a varistor, a fuse, an inductor (also known as a choke), a rectifier bridge, a filter capacitor, an operational amplifier IC (integrated circuit), a temperature probe, a high-power switch, a switching transformer, and a secondary rectifier. Secondary filter capacitors, in addition to the above components, there are adjustable potentiometers and other RC components on the circuit board. The tools/materials required to remove the power adapter include an electrician knife, a hammer, a screwdriver, a soldering iron, a utility knife, and the like. In addition, the upper and lower covers of the general power adapter are injection-molded or glued with super glue, and do not need any screws, so they can only be cracked by violence. However, as long as the method is correct, the disassembled power adapter can be completely restored, and there is almost no visible trace without careful observation. Demolition power adapter introduction II Here is the disassembly of the laptop's power adapter. First, place the lateral side of the power adapter on a white paper and use an electric knife blade to cut along the gap between the upper and lower covers of the power adapter. Then, tap the back of the electric knife with a hammer and cut the electric knife between the upper and lower covers of the adapter. Secondly, at different positions of the gap between the upper and lower covers of the adapter, use the tip of the electrician knife to move along the slit. When a certain part of the upper and lower covers is first cracked, the tip of the blade is deepened, and then the upper and lower covers of the adapter are slowly separated. . Then open the power adapter of the outer casing, you can see the copper shield on the outside of the adapter circuit, cut the tape on the shield with a utility knife, and then solder the shield to the inner circuit board. Click to remove the shield. There is also a thick layer of hard plastic film between the shielding layer and the circuit board. After being cut with a utility knife, the disassembly is completed. The above is the detailed steps of the method of removing the power adapter.

    2018 10/10

  • How to identify the quality of LED power supply?
    After years of experience in contact with lighting manufacturers, I often feel that the lighting manufacturers do not want to buy a good LED power supply, but do not know how to identify the LED power supply is good, and also worry about whether to spend a high price to buy low quality LED power supply. . Therefore, as a lighting manufacturer, the most difficult feedback is to buy LED power supply, because the quality of the power supply is difficult to detect, aging in its own factory for 4 hours, and some even aging for 24-72 hours, but these aging products are often in A 5% or higher ratio is bad for 3-6 months of shipment. So if you identify the quality of the LED power supply? We can identify it from the following points: First, the driver chip: IC The core of the driving power supply is the IC, and the quality of the IC directly affects the entire power supply. The driver ICs of Dachang are all purchased by the crystal garden to find a large packaging factory to package. The driver IC technology of the small factory is to directly copy the drive design of the large factory to find a small package factory to package, which can not guarantee the whole batch of ICs. Consistency and stability, resulting in inexplicable failure of the drive power after a period of use. Therefore, the IC on the LED power supply refuses to be polished, so that the lamp manufacturer can understand the cost of the IC solution and the accounting driver, and purchase the power product at a reasonable price. Second, the transformer The control chip can be regarded as the brain center of the power supply, and the power, temperature resistance, etc. are the transformers. The transformer is responsible for completing the "AC-Magnetic-DC" and the energy overload will saturate the bomber. The core of the transformer is the core and the wire package. Core quality is the core of the transformer, but like porcelain, it is extremely difficult to distinguish. The simple appearance is distinguished as: the appearance is crisp, dense and bright, and the back side is polished to the top. At present, the magnetic core used by Shanghai Nuoyi is a mold-opening PC44 core, which ensures high efficiency of the power supply. The wire package is made of copper wire winding. The quality of the copper wire is the key to affect the life of the transformer. The same length of copper-clad aluminum wire is 1/4 of the price of pure copper wire. Due to the cost pressure, the transformer manufacturer often mixes the transformer of the copper-clad aluminum wire package inside. As a result, the burnout failure occurs when the temperature of the transformer rises, resulting in failure of the power supply and the entire lamp. Therefore, many lamps, especially the built-in power supply lamps, often ship for about 6 months. And how to distinguish whether the copper wire is pure copper wire or copper clad aluminum? Use a lighter to ignite it, and quickly burn it is copper-clad aluminum. It is also possible to measure the resistance of the coil for identification. Third, electrolytic capacitors and chip ceramic capacitors The quality and life requirements of the input electrolytic capacitors may be known to everyone, and everyone pays great attention to them. However, people often ignore the quality requirements of the output capacitor. In fact, the life of the output capacitor has a great influence on the life of the power supply. The output has a switching frequency of up to 60,000 times per second, which causes the parasitic resistance of the capacitor to heat up, producing a scale-like substance, and finally the electrolyte heats up and bursts. Recommended output electrolytic capacitor: LED dedicated electrolysis, the general model starts with L. At present, our output electrolysis is Aihua's high-life electrolytic capacitor. Ceramic capacitors: The material is divided into X7R, X5R and Y5V, and the actual capacitance of Y5V can only reach 1/10 of the actual value. The nominal capacitance only refers to the operation at 0 volts. Therefore, this tiny chip resistor, poor options will also lead to cost price differences and greatly shorten the life of the power supply. Fourth, circuit design and soldering process for power products Judging the pros and cons of design: Aside from the professional point of view, it can be distinguished by some intuitive methods, such as neat, generous, orderly, and clean and straight. A good engineer will not make a messy design. As for flying lines and manual components, it is a serious lack of technical strength. Welding process: manual welding and wave soldering process. It is well known that the quality of wave soldering process in mechanized production is definitely better than manual soldering. Discrimination: Whether there is red glue on the back. (The solder paste process + soldering fixture can also achieve wave soldering, but the fixture cost is high). Solder joint inspection equipment for patches: AOI. The device can detect the phenomenon of virtual welding, false welding and leakage welding during the patching process. At present, the flashing phenomenon of the lamp during use for a period of time is basically caused by the power supply or the bead welding of the lamp bead. The solder joint inspection of this product is extremely difficult to pass the aging test, so it is necessary to rely on AOI to detect the quality of the power patch. Fifth, batch testing of power products, aging racks and high temperature aging rooms The best power products controlled by materials and production processes still need to be tested for aging. Because incoming inspection of electronic components and transformers is difficult to control. Only through the aging of the entire batch of power and the high temperature sampling of the high temperature room, the quality stability of the batch power supply and the safety of the materials are detected. The role of high-volume high-temperature sampling: At present, the failure of the power supply is between 1/100%, and only thousands of high-temperature aging will find such failure. High-temperature rooms can simulate the harsh environment of power supply work. In the case of sampling under tightened conditions, batch problems can be found, such as unreasonable design, poor raw materials, failure in deriving lamps, and high-voltage switch impact. Long-term aging at room temperature: Screening for random failures such as virtual welding, leak welding, collision, etc., filtering out early failure of components and effectively reducing the failure rate of finished products (one percent down to one thousandth). At room temperature aging, it is very expensive to use aging equipment and personnel. The factory with a daily output of 100,000 power supplies, the aging equipment covers at least 500 square meters, more than 10,000 aging, and the pipeline is aging, which is rare in the industry.

    2018 09/25

  • Explain the principle of switching power supply and switching power supply schematic diagram
    Switching power supply is used to control the switch through the circuit for high-speed road and deadline. The DC into high-frequency AC power provided to the transformer transformer, resulting in the required group or groups of voltage! Re-transmission to high-frequency AC because high-frequency AC transformer transformer circuit in the efficiency of more than 50HZ A lot, so the switching transformer can be done very small, and the work is not very hot, the cost is very low, if you do not change the high-frequency 50HZ switching power supply that does not mean Switching power supply workflow is: Power → input filter → full-bridge rectifier → DC filter → switch (oscillation inverter) → switch transformer → output rectifier and filter. The AC power input is rectified and filtered into DC Through the high-frequency PWM (pulse width modulation) signal control switch, the DC will be added to the primary switch transformer Switching transformer secondary induction of high-frequency voltage, the rectifier filter supply to the load Output part of the circuit through a certain feedback to the control circuit, control PWM duty cycle, in order to achieve the purpose of stable output AC power input generally go through the Eau circle of a class of things, filter out the interference on the grid, but also filter out the power supply interference on the grid; At the same power, the higher the switching frequency, the smaller the size of the switching transformer, but the higher the requirements of the switch; The secondary of a switching transformer can have multiple windings or multiple windings per winding to obtain the desired output; General should also increase some protection circuit, such as no-load, short circuit protection, or it may burn the switching power supply. Mainly used in industry and some household appliances, such as televisions, computers and so on Switching Power Schematic Analysis 1, forward circuit The working process of the circuit: a> When the switch S is turned on, the voltage across the transformer winding N1 is positive and negative, and the voltage across the N2 winding coupled with it is also positive and negative, so VD1 is in the on state, VD2 is in the off state, and the current in the inductor L is gradually increasing ; b> S off, the inductor L through VD2 freewheeling, VD1 off .S off after the transformer excitation current through the N3 winding and VD3 back to power, so S off after the withstand voltage. c> Transformer core reset: After the switch S is turned on, the excitation current of the transformer starts from zero and increases linearly with time until S turns off.To prevent the transformer from magnetizing the excitation inductance, we must try to make the excitation current in S Turn off to the next reopening of a period of time back to zero, the process known as the transformer core reset. Idealized waveform of the forward circuit: Transformer core reset time: Tist = N3 * Ton / N1 Output voltage: output filter inductor current continuous case: Uo / Ui = N2 * Ton / N1 * T Core reset process: 2, flyback circuit Flyback circuit schematic The transformer in the flyback circuit plays the role of energy storage element, which can be seen as a pair of coupled inductors. work process: After the opening of S, VD is in the off state, the current of N1 winding linearly increases, and the energy storage of the inductor increases. S turns off, the current of the N1 winding is cut off, and the magnetic field energy in the transformer is released to the output through the N2 winding and the VD. The voltage after the S is turned off is: us = Ui + N1 * Uo / N2 Flyback circuit mode of operation: Current Continuous Mode: When S is on, the current in the N2 winding has not dropped to zero. Output voltage relationship: Uo / Ui = N2 * ton / N1 * toff Current Intermittent Mode: The current in N2 winding has dropped to zero before S turns on. The output voltage is higher than the calculated value of the above equation and increases as the load decreases

    2018 09/18

  • LED power supply has to rely on innovation for survival
    Most of the LED power companies in this year are in the depths of the labyrinth. A few leading companies are slowly moving towards the light after walking through countless corners, and more companies are stalking after they ran for a while, and will only be in the dark forever. struggle. In the first half of the year, the changes in the domestic environment have almost become the consensus of the industry. In the past few years, the government-led municipal engineering has entered an adjustment period this year, and the growth rate of the engineering market, which is mainly based on energy-saving renovation, has also begun to slow down. In addition to a small number of lighting companies that have channels and traditional lighting to LED, the circulation channels are all in the distribution stage. In order to speed up the popularization of LED lighting, various lighting manufacturers have tried to drive down the price. As a core supplier of LED lighting, power supply manufacturers generally feel the pressure of price war. On the contrary, the demand for overseas markets has maintained rapid growth this year. Many domestic power supply factories have the idea of exporting, and they are unable to meet the high certification requirements. The increase in revenue but not necessarily the increase in LED drive power is entering the mature period from the growth period. This year's domestic market, the average power supply price has dropped by an average of 10-20, and the medium and small power has reached 20-30. Although the domestic market is relatively weak, the foreign market is still relatively It`s a good thing, so the shipments of companies involved in both markets can reach the same level as last year. However, after offsetting the price decline, it is very difficult for manufacturers to maintain a fixed annual net profit. This is particularly evident in small and medium power supply manufacturers. A person in charge of a small power supply company told reporters that their monthly sales exceeded 20 million yuan, but they have lost money for several months. Wu Chunxiao, general manager of Maoshuo Power Strategy Planning Department, said in an interview that the main reason for the decline in domestic high-power power supply prices is that the demand for street lamps in the domestic market has decreased this year, and market competition has intensified. At the same time, the phenomenon of homogenization after product maturity is more Obviously, the price is gradually transparent, so the profit margin of street lamp power supply manufacturers is further compressed. Based on the above market conditions, most of the LED power supply companies that have previously deployed the domestic market have plans to go out, and some have already been put into practice, but the export companies have basically not returned to the domestic market. At the same time, the promotion of LED street lamps in mainland China is relatively early, strong and wide. The overseas road lighting market started relatively late, basically taking the domestic market as the wind vane. Most of the lamps and power supplies are developed and produced by domestic enterprises. The remarkable energy-saving effect of LED street lamps is attracting the emergence of foreign market replacement tides, especially the US market. As a major energy consumer, the United States accounts for a large proportion of energy consumption in public lighting. All states are actively promoting the replacement of LED street lamps. The demand for LED street lamps is very strong for quite some time. Compared with the domestic market, the prices in the European and American markets are relatively stable. Zhang Huajian, deputy general manager of Infineon Electronics, told reporters that overseas customers pay more attention to product quality than their prices. Their requirements for product quality verification and supplier strength, such as development capability and production process control, will be very strict. The cost of repairing overseas street lamps is very high, driving streetlight customers to prefer to cooperate with brand power suppliers. Foreign countries also have a ban on white (bidding the use of incandescent lamps) and policies related to energy conservation and emission reduction, so that many domestic power supply manufacturers see business opportunities and strive to open up overseas markets, and competition is inevitable. Of course, the high certification requirements in the European and American markets have blocked many companies entering the market. Most of these companies have flocked to the Southeast Asian market, which has low requirements and intense price wars. This has led to more intense price competition in areas that could not afford to sell. On the other hand, even if the domestic market is weak, it still cannot stop the development of international manufacturers. For example, Philips has not given up the domestic high-power power market, and gradually stabilizes large customers through extreme design, and is fierce with domestic high-power power companies. Competition, while Taiwan's power supply company Mingwei has been steadily increasing after years of precipitation. However, problems such as slow response of international and Taiwanese corporate complaints still exist. Domestic companies and their competition in the high-power power market are still unclear, but it is an indisputable fact that affects the market share of domestic enterprises. In the long run, streetlight orders tend to be concentrated, and it is very likely that the future of streetlight power companies will be full of three or more. This point has been very obvious in the small and medium power supply, the former power supply factory market has been very strong, leaving the followers. Small and medium-power relative to high-power power supply will have fewer complaints, and the technical difficulty is relatively low. Many workshop-style enterprises have disrupted the normal order of the entire market, and the original thin profit has been further compressed. Some insiders said that the current industry's general net profit is around 5, and the era of high profits has long been a thing of the past. Li Jinhong, general manager of Kegu Power, said that their positioning is mainly for commercial lighting power supply. The domestic and foreign market revenue is almost 5:5. The foreign market is bargaining this year but the price is still stable, but the domestic market customers are basically from time to time. Let`s talk about the price. In fact, there are not many manufacturers that actually regulate the power supply in the Chinese market. The competition among the regular manufacturers has also become fierce. The competition between the boss and the second child is always a small brother. With the official launch of 3C certification next year, manufacturers of parallel power supplies will gradually withdraw from the stage. However, in a short period of time, the pattern of power supply companies with more than ten years of history will continue to lead the way and will not be broken in a short time.

    2018 09/14

  • High-power LED power supply factory has a low market share and a serious decline in profits
    [Wen/Wang Cairong] Since the second half of 2013, benefiting from the local government's accelerated popularization of LED lighting renovation in the public sector and the booming business market, the demand for high-power LED driver power supply has also prospered. For LED driver manufacturers, this is naturally good news, but it also indicates that new high-power LED driver manufacturers will once again usher in a new contest. In general, high-power LED driver power supply coverage is 60W-300W, mainly used in LED street lights, LED tunnel lights, landscape lighting and some high-power commercial lighting. At present, the domestic large-scale high-power LED outdoor power supply enterprises mainly include Moso Power (002660.SZ), Shilong Fuhua (UE), Infineon, Zhongheng Paiwei, Kelik, Mingwei Electronics and so on. Despite the wide range of applications and large manufacturers, so far, no one has seen any power supply manufacturers in the market share of high-power LED driver power supply, especially in the market, with absolute say in the market. Take the old power supply factory Dongguan Shilong Fuhua as an example. At present, the annual output of its high-power LED outdoor power supply is about 300,000 units. For example, a LED street light with a power supply is conservatively calculated according to the shipment of 2.5 million LED street lamps in China in 2013. Its market share in the outdoor LED high-power power market is only 12%. While several other LED power supply manufacturers are well-known in the industry, no one manufacturer has been able to dominate the market in China. This is reflected in the feedback from the current LED LED street manufacturers. One of the procurement leaders of Qinshang Optoelectronics, which once dominated the LED streetlight market, said frankly that there are many suppliers of driving power for LED streetlights, and several LED power plants in China have a cooperative relationship with them. In fact, the reason for the domestic high-power outdoor LED lighting power supply is not strong, but the reason lies in the power supply enterprise's own strength, and on the other hand, the current outdoor LED driver power has been tapped into the market space is not big enough, LED outdoor The market penetration of lighting is still low. [According to the cumulative installation volume, the penetration rate of China's LED streetlight market in 2012 is less than 10%, but not more than 15% in 2013." Zhang Hongbiao, research director of Gaogong LED Industry Research Institute (GLII), said that in the future, high-power outdoor LED lighting The domestic market potential needs to be tapped. However, while the current penetration rate of the LED street lamp market is slow, the profit margin of the LED high-power power supply related to it has shrunk severely. "In recent years, there have been many new LED street lamp power supply manufacturers in the mainland market. As the price of LED street lamps has gradually declined, the related LED street lamp factories have to lower the price of LED driving power. Many street lamp biddings are local government actions, in order to support The power of the local small factory will also be used." Wang Xingang, general manager of Shenzhen Jingchen Electronic Technology Co., Ltd. said that the small factory`s involvement has lowered the average price and gross profit margin of the market power supply, and the price of the bidding is gradually lower. Compressed the company's profits. Li Tao, general manager of Dongguan Shilong Fuhua Marketing, told reporters that the current average gross profit margin of outdoor LED street lamps has dropped to around 25%. The gross profit margin of Maosuo Power, the only listed company in China's LED driver power supply, was relatively high, reaching 29.12%, down 3.67% year-on-year, but it was also shrinking compared with the previous year's gross margin of 45%-50%. Nearly 20%.

    2018 09/11

  • Matters needing attention and development direction when LED power supply is applied to LED street lamps
    Author: Xulian City Global humans are working hard to change the impact of the global warming effect, and the call for energy conservation and emission reduction is high. Today's focus product " LED street light", which can be called the energy-saving "long life" project, has become the "darling" of the energy-saving lighting industry. According to a survey by the High-tech LED Industry Research Center, among the 21 pilot cities in the [Ten Cities and Ten Thousand Cities" in 2009, LED street lights (including tunnel lights) have been installed, which is about 222,000 baht. Among them, 35,000 in Weifang, 28,000 in Wuhan, 25,000 in Chongqing, and 15,000 in Yangzhou. The sum of the installed lights in the four cities is 103,000, accounting for nearly half of the total. Most cities are still in the pilot phase of the project in 2009 and are expected to be rolled out in large quantities within two years. But we must clearly understand that when everyone is promoting the long life of LED, it ignores or avoids another key issue that determines the life of LED lamps: that is the quality of LED driver power . In this regard, the author has made a brief analysis of the key parts that affect the quality of LED power supply, for your reference! LED power supply life: Since LED lamps are different from traditional lamps, except for part of the power converted into light energy, most of the power is converted into infrared radiation energy to the external space of the lamp (just like the Yuba lamp), and the LED is semiconductor light. Except for part of the power converted into light energy, most of the power is converted into heat, which can only be dissipated by the lamp body tightly coupled with the chip. In order to make the overall structure of the lighting products beautiful, the business often closely designs the power supply and the LED light body structure. The heat of the LED and the heat of the power supply are superimposed, so that the power source and the LED light source are in a bad working environment, when the temperature of the working environment When the temperature exceeds a certain temperature, the life of the power supply and the LED is greatly reduced. When the temperature is set inside the power supply, the phenomenon of repeatedly switching the light will occur. If the temperature protection is not set, the high temperature will damage the power supply device and accelerate the light decay of the LED. The LED power supply belongs to the switching power supply. The quality and reliability of the switching power supply depend on its circuit design, production process, and quality of the device. Electrolytic capacitors are an integral part of high-power switching power supplies. The normal working life of the switching power supply depends on the life of the electrolytic capacitor used by the power supply. The life of the electrolytic capacitor depends on the life of the capacitor itself and the operating temperature. Electrolytic capacitors vary greatly in their operating life at different temperatures. Take a famous foreign brand electrolytic capacitor as an example: Its universal -40 ° C - +105 ° C specification capacitor life guarantee value (at 105 ° C full load conditions) 4000 hours. If we design the maximum value of the capacitor ripple current load to 85%, then: according to its life estimation formula The life of the capacitor at 65 ° C can only guarantee about 80,000 hours; The life of the capacitor at 75 ° C can only guarantee about 40,000 hours; The life of the capacitor at 85 ° C can only guarantee about 20,000 hours; The life of the capacitor at 95 ° C can only guarantee about 10,000 hours; From the above calculations: for every 10 °C rise in electrolytic capacitor temperature, the life will be halved. Schematic diagram of operating temperature of electrolytic capacitor The self-temperature rise of the power supply: the power supply design of the better power device temperature rise is around 25-30 °C, the design of the relatively poor temperature rise is greater than 35 ° C, the outdoor LED power supply requires waterproof, a sealed enclosure is required, for the protection level Improve the manufacturer's requirements for potting treatment, different colloidal materials cost and cost are different, thermal conductivity is not the same, low-cost adhesives have poor thermal conductivity, and need high temperature baking, which often causes different degrees of invisible damage and tight strain of components. Leave hidden dangers. (The bad heat treatment makes the working environment of the electrolytic capacitor in the housing be like a thermos bottle, and the temperature accumulation cannot be released). The temperature rise of the lamp itself: Because the large amount of heat generated by the LED itself relies on the housing to dissipate heat, the temperature of the LED lamp housing is reasonably designed to be between 20 ° C and 25 ° C. Namely: under the working condition of room temperature 25 ° C, the lamp housing temperature is about 45 ° C -50 ° C. Working environment temperature of lamps: In some areas, the outdoor surface temperature in summer is as high as 40 °C or even higher. Comprehensive application conditions: The temperature of the capacitor working environment will be greater than 95 °C in harsh environments. It has also been suggested whether ceramic or solid capacitors can be used, but with the current capacitive technology, these two capacitors cannot be made into high voltage and large capacity. Of course, a good saddle needs to be equipped with a good horse. Using a long-life capacitor does not necessarily guarantee the power life. To improve the power supply life, it needs to be improved in many ways: Use higher life capacitors to improve power efficiency, optimize heat dissipation design of the power supply, and optimize heat dissipation design of the fixture. In order to consider the compactness of the luminaire design in order to reduce the weight, many luminaire companies require that the power supply volume be compact and installed in a closed space, and the heat dissipation conditions of the power supply are limited. Therefore, high efficiency, small size and better heat dissipation design are challenges for power supplies.

    2018 09/07

  • Moso Power: Sales of small power LED power supply increased
    Mao Shuo Power Dongjun Fang Jibin said that in 2013, the focus will be on expanding the low-power LED power supply market. The low-power LED power supply will achieve 10 million sales last year. This year's sales will reach more than 20 million, which means that sales of low-power LED power will increase. Doubled. Low-power LED power supplies are generally used in conjunction with indoor LED lights. Fang Jibin further said that the company has planned to release some small-power LED power supply capacity this year, but there is no clear target yet. This year, it will focus on the production of low-power LED power supply. In the company's total business, high-power LED power supply accounts for a large proportion, while low-power LED power supply is relatively small, Fang Jibin revealed that because the indoor LED lamp price is relatively cheap, the low-power LED power supply gross margin is relatively low compared to the high-power LED power supply. One point, the current gross margin of low-power LED power supply is estimated to be around 20. It is expected that the indoor home LED lamp market will be very large next year, and the company will gradually expand the production of low-power LED power according to the market conditions. Fang Ji Pen added. It is reported that the US Congress has passed the ban on incandescent lamps. The United States will stop selling the best-selling 40-watt and 60-watt incandescent lamps on the New Year's Day in 2014. It is worth noting that China will also regulate the regulation of incandescent lamps. Some industrial applications have expanded into the field of indoor lighting. The company announced in the third quarter that its operating income was 399 million yuan, an increase of 6.73 compared with the same period of the previous year. The net profit attributable to shareholders of listed companies was 31 million yuan, a decrease of 18.86 compared with the same period of the previous year.

    2018 09/04

  • Power adapter common maintenance tips
    1. Avoid wet environment The use of notebook power adapters should be taken care of to avoid wet environments. The function of the power adapter is to convert 220 VDC from household electricity into DC power, so it should never be used in a humid environment. Whether the power adapter is placed on the table or on the ground, please be careful not to put a cup or wet thing around it to prevent the adapter from burning out. 2, pay attention to heat dissipation in high temperature environment In a high room temperature environment, we can put the adapter on the side, pay attention to the heat dissipation of the power adapter. Unlike a laptop, the power adapter is just a sealed, precision appliance that can be cooled by a fan unlike a computer. Since the adapter itself works as a process with more heat dissipation, if the room temperature is still high, it is too unfavorable for the maintenance of the power adapter. Remember not to use the power adapter for too long at high temperatures. If you have to use it for a long time, you need to pay attention to its heat dissipation, such as using a fan to assist the convection heat dissipation. It is also possible to insert a narrow plastic block or metal block between the adapter and the desktop to increase the air convection speed around the adapter and accelerate the heat dissipation of the adapter. 3, use the model-matched power adapter As we all know, the notebook power adapter generally consists of two parts, one is a power cord, one end is a power plug, one end can be plugged into the adapter, and the other part is the adapter body and connected to the data line plugged into the computer. If the notebook's original adapter is damaged, you should purchase and use the original model to match the product. If you use a similar product in the cottage, it may be used for a short time, but due to the difference in manufacturing process, there will be a greater risk of long-term use, and even a short circuit, burnout and other risks. 4, reasonable charging When the battery of the notebook is in the state of charge, it is best not to run large 3D games and other programs that make the whole work load heavier, so that the battery charging speed is slow or unfilled due to insufficient power supply output power shortage, the power supply The adapter is overloaded and so on. 5. If an abnormality occurs, stop using it in time. When the power adapter emits large working noise or even smoke, it is often damaged or malfunctions. It should be stopped immediately and can be used again after being repaired by professional engineers. 6, often wipe and clean dust For the maintenance of the notebook power adapter, it is necessary to clean the dust frequently and gently handle it to prevent the collision. As mentioned earlier, the notebook power adapter is an appliance that generates a large amount of heat and requires good heat dissipation. However, due to its design, many power adapters have poor heat dissipation. In daily use and maintenance, you should always use a dry soft cloth or paper towel to wipe the surface dust to prevent dust from entering the gap and reduce heat dissipation.

    2018 08/30

  • 6 key points for maintaining the power adapter
    1. Avoid wet environment The use of notebook power adapters should be taken care of to avoid wet environments. The function of the power adapter is to convert 220 VDC from household electricity into DC power, so it should never be used in a humid environment. Whether the power adapter is placed on the table or on the ground, please be careful not to put a cup or wet thing around it to prevent the adapter from burning out. 2, pay attention to heat dissipation in high temperature environment In a high room temperature environment, we can put the adapter on the side, pay attention to the heat dissipation of the power adapter. Unlike a laptop, the power adapter is just a sealed, precision appliance that can be cooled by a fan unlike a computer. Since the adapter itself works as a process with more heat dissipation, if the room temperature is still high, it is too unfavorable for the maintenance of the power adapter. Remember not to use the power adapter for too long at high temperatures. If you have to use it for a long time, you need to pay attention to its heat dissipation, such as using a fan to assist the convection heat dissipation. It is also possible to insert a narrow plastic block or metal block between the adapter and the desktop to increase the air convection speed around the adapter and accelerate the heat dissipation of the adapter. 3, use the model-matched power adapter As we all know, the notebook power adapter generally consists of two parts, one is a power cord, one end is a power plug, one end can be plugged into the adapter, and the other part is the adapter body and connected to the data line plugged into the computer. If the notebook's original adapter is damaged, you should purchase and use the original model to match the product. If you use a similar product in the cottage, it may be used for a short time, but due to the difference in manufacturing process, there will be a greater risk of long-term use, and even a short circuit, burnout and other risks. 4, reasonable charging When the battery of the notebook is in the state of charge, it is best not to run large 3D games and other programs that make the whole work load heavier, so that the battery charging speed is slow or unfilled due to insufficient power supply output power shortage, the power supply The adapter is overloaded and so on. 5. If an abnormality occurs, stop using it in time. When the power adapter emits large working noise or even smoke, it is often damaged or malfunctions. It should be stopped immediately and can be used again after being repaired by professional engineers. 6, often wipe and clean dust For the maintenance of the notebook power adapter, it is necessary to clean the dust frequently and gently handle it to prevent the collision. As mentioned earlier, the notebook power adapter is an appliance that generates a large amount of heat and requires good heat dissipation. However, due to its design, many power adapters have poor heat dissipation. In daily use and maintenance, you should always use a dry soft cloth or paper towel to wipe the surface dust to prevent dust from entering the gap and reduce heat dissipation.

    2018 08/28

  • Questions about LED power supply and LED emergency power supply
    The LED luminaire is a DC light source. The conventional LED luminaire itself has a driving power source (constant current source). When the mains starts, the AC input, the DC output, and the LED light source illuminate. Nowadays, emergency lighting involving security is getting more and more attention. Most of China's LED light source products are sold to the international market. At present, both the international market and the domestic market pay more and more attention to lighting safety, especially in public places, which need to install a considerable proportion of emergency lighting fixtures, which can continue to illuminate for several hours after power failure, so LED emergency power supply has its place. . About the introduction of LED emergency power supply, our company has detailed details. I often ask guests, I installed LED emergency power supply, then the original drive power is still used? This should be answered after specific analysis: 1. Some LED emergency power products, after power failure, invert the energy stored in the battery pack into the mains 80--280V, equivalent to the continuation of the mains, then the drive power must exist, because this emergency power supply is also driven A constant current source is used to illuminate the LED luminaire. 2, some LED emergency power products, such as 168-30 series products, the output after power failure is DC low voltage, it can automatically identify the serial number of lamps, the output voltage is generally adjusted between 20--80V, when there is electricity It charges and stores the battery pack, and lights up the LED fixture after power failure. In this case, if the luminaire is only used for emergency lights, and the mains illumination is not needed, the LED constant current source can be cancelled. 3 If the LED light source needs illumination during mains supply and illumination is required during power failure, the drive power supply must be present. 4. During the lighting process of the mains, the emergency power supply continuously supplies the battery pack. In the state of the mains, it will not drive the lighting; after the battery pack is saturated, the charging current of the emergency power supply is transferred to the charging or micro-charging state. To compensate for the self-discharge of the battery pack, the emergency power supply does not affect the normal lighting function of the LED light source; 5. The LED light source used solely for emergency lighting can be driven without a constant current source. The premise is that no lighting is required in the mains state and only in the event of a power outage. This situation must be fully understood before purchase; 6. If the user arbitrarily cancels the driving power and installs the LED light source directly on the LED emergency power output port, the most likely condition is that the high voltage (110V or 220V) of the LED emergency power output will burn the light board or the lamp bead. . 7. At present, due to many limitations, the drive power and emergency power cannot be integrated in the same board. Moreover, it is very important that the light source used for emergency lighting after power failure is still too small, and is limited by power, structure and other factors, and the integrated power supply board is still not mature.

    2018 08/20

  • Introduction to the type and function of the power adapter
    In some small portable electronic devices such as telephone handsets, game consoles, language repeaters, walkmans, laptops, cellular phones, etc., we often have power adapters. So what is the power adapter? What is the role? This article will explain for you one by one. What is the power adapter? The power adapter is also called an external power supply. It is a power supply voltage conversion device for small portable electronic devices and electronic appliances. Its function is to convert the 220 volt high voltage in the home into a stable low voltage of 5 volts to 20 volts. The voltage makes them work properly. 1, the type of power adapter The power adapter is mainly divided into two types, a switching power supply and a linear power supply. 1) Switching power supply is a kind of power supply that uses modern electronic technology to control the ratio of time when the switch is turned on and off, and maintains a stable output voltage. The switching power supply of the power adapter is generally composed of a pulse width modulation (PWM) control IC and a MOSFET. Advantages: high work efficiency, small size, can work in a wide voltage range. Disadvantages: The interference to the power supply circuit is large, and it is difficult to repair when the fault occurs. 2) The linear power supply converts the alternating current through the transformer, and the rectifier circuit rectifies and filters to obtain the unsteady DC voltage. To achieve the high-precision DC voltage, the power adapter must adjust the output voltage through the voltage feedback circuit. Advantages: This power supply technology is mature, the circuit is simple, and there is no interference and noise from the switching power supply. Disadvantages: The voltage feedback circuit works in a linear state. The power consumption of the adjustment tube is large, and the conversion efficiency is low. Because of the use of an inductive transformer, the weight of the device is large. 2, the nameplate of the power adapter There is a nameplate on the power adapter that indicates the power, input and output voltage and current amount. As shown in the figure, there are generally several items that need to be noted on the label of the power adapter (hereafter referred to as the adapter). The first is the model of the adapter. For example, the model of this adapter is XVE-120100. It tells us a few information, that is, its manufacturer, main parameters, etc. The beginning of XVE is generally ##, 120100 is to explain this Adapter is 12W, 050200 is 10W; the second is the INPUT (input) of the adapter, which is generally 100-240V~50-60Hz in China, which means that the adapter can work under the voltage of 100V-240V. The third is the OUTPUT (output) of the adapter. The two numbers can quickly calculate the wattage of the adapter. For example, the adapter, voltage 12V* current 1A12W (power), indicates that the power supply is a 12W adapter. 3, the role of the power adapter The power adapter acts as a transformer and rectifier. The household AC is 220v, and our computer land is DC 12v (as if it is), so we can be sure that the power adapter is a transformer and rectifier. Then the adapter is a transformer, we should all know that the AC 220V is transformed by the transformer, and the DC is changed by the rectifier. Here, there is consumption, and these consumption are converted into heat, so it is normal for the power adapter to heat up. The transformer is made of silicon steel sheet. When the transformer is energized, magnetic flux is generated. The magnetic flux will cause a force between the silicon steel sheets to generate a click sound, which is normal. However, the sound of the earth is not normal, and there are many reasons: 1. The AC voltage is unstable. 2, the chip is damaged. 3. Short circuit between turns. 4. Component damage. 4, the application of the power adapter It is widely used in consumer electronics, and the output power is mostly within 100 watts, and the market demand is growing rapidly. Applications such as electric bicycle battery chargers, small size LCD TVs, laptops, printers, DVD players and set-top boxes are available. Most of the early power adapters used linear transformers. As consumer electronics products have high efficiency, wide input voltage range, and increased copper, iron, and labor costs, the original linear transformers in these power adapters are gradually increasing. Replaced by switching power supply. Summary: This article mainly helps you to understand the concept of the power adapter, focusing on the role and application of the power adapter, but with the continuous development of science and technology, the application of various scientific research projects to the power adapter The demand has increased year by year, and many new requirements have been put forward for its accuracy, performance, specifications, variety, type, volume, etc. The existing power adapter can not meet the current needs, research and development of a variety of new power adapters. It has become an objective demand, and its social and economic benefits are relatively significant, and the market prospects are relatively bright.

    2018 08/16

  • Switching power supply and regulated power supply difference - Database & Sql Blog Articles
    MOS power IC full range. KKST patch plug-in active passive crystal oscillator hot sale 24.576000MHZ The power supply has a switching power supply and a regulated power supply. These two power supplies are different, but there are similarities. The switching power supply is a regulated power supply widely promoted in modern times. It has the characteristics of high efficiency, wide voltage range, stable output voltage, etc. It is now widely used. For example, the computer's ATX power supply, laptop power adapter, printer power supply, mobile phone charger, and so on. The regulated power supply is a voltage value at which the output voltage remains fixed as the load power changes. The switching power supply is also a regulated power supply, but the regulated power supply cannot be directly called a switching power supply. The regulated power supply is a power supply that uses an output voltage of an electronic circuit to achieve a stable purpose, and has a series-type regulated power supply, a parallel-type regulated power supply, and a switching regulated power supply. The common series regulator power supply is equipped with a power transformer, which has the advantages of stable output voltage and small ripple, but the voltage range is small and the efficiency is low. The output voltage of the shunt regulated power supply is particularly stable, but the load capacity is very poor, and it is only used as a reference inside the meter.

    2018 08/14

  • What is a switching power supply? What is the working principle of the switching power supply?
    Switching power supply is widely used in production and life. It is an important part of electronic design. Switching power supply is small, lightweight and efficient. But do you really know about switching power supply? This article will introduce you from the meaning of the switching power supply, the working principle of the switching power supply, etc., to help you better understand the switching power supply. First, what is the switching power supply Switching power supply is the use of electronic switching devices (such as transistors, FETs, thyristors, etc.), through the control circuit, so that the electronic switching device is constantly "on" and "off", so that the electronic switching device The input voltage is pulse modulated to achieve DC/AC, DC/DC voltage conversion, and adjustable output voltage and auto-regulation. Switching power supplies are relatively linear power supplies. The input terminal directly converts the alternating current into direct current, and then under the action of the high-frequency oscillation circuit, the switching tube is used to control the on and off of the current to form a high-frequency pulse current. With the help of an inductor (high-frequency transformer), a stable low-voltage direct current is output. Since the core size of the transformer is inversely proportional to the square of its operating frequency, the higher the frequency, the smaller the core. This greatly reduces the transformer and reduces the weight and volume of the power supply. And because it directly controls DC, this power supply is much more efficient than a linear power supply. This saves energy, so it is favored by people. However, it also has disadvantages, the switching power supply circuit is complicated, the maintenance is difficult, and the pollution to the circuit is serious. The power supply is noisy and is not suitable for use in some low noise circuits. Linear power supply (Liner power supply) is the first current flows through the transformer to reduce the voltage amplitude, and then after the rectifying circuit, to give pulsed DC, the filtered DC voltage with a slight ripple voltage. To achieve high precision DC voltage, it must be regulated by a voltage regulator circuit. Second, the working principle of the switching power supply The working process of the switching power supply is easy to understand. In a linear power supply, the power transistor operates in a linear mode. Unlike a linear power supply, the PWM switching power supply allows the power transistor to operate in a turn-on and turn-off state. In both states, the volt-ampere product applied to the power transistor is small (low voltage, high current during turn-on; high voltage, low current when turned off) / volt-ampere product on the power device Losses generated on power semiconductor devices. Compared with the linear power supply, the PWM switching power supply works more efficiently by [chopper", which is to convert the input DC voltage into a pulse voltage whose amplitude is equal to the input voltage amplitude. Third, the advantages and disadvantages of switching power supply: The main advantages of switching power supply: small size, light weight (20 to 30% of volume and weight of linear power supply), high efficiency (generally 60 to 70%, and linear power supply only 30 to 40%), strong anti-interference The output voltage range is wide and modular. The main disadvantage of the switching power supply: due to the high frequency voltage generated in the inverter circuit, there is some interference to the surrounding equipment. Good shielding and grounding are required. The alternating current is rectified to obtain direct current. However, due to changes in AC voltage and load current, the DC voltage obtained after rectification usually causes a voltage change of 20% to 40%. In order to obtain a stable DC voltage, a voltage regulator circuit must be used to achieve voltage regulation. According to different implementation methods, the regulated power supply can be divided into three types: linear regulated power supply, phase-controlled regulated power supply, and switching regulated power supply. Among them, switching power supply represents the development trend of low-carbon environmental protection and advanced power supply. Fourth, the precautions when switching power supply selection (1) Select the appropriate input voltage specifications; (2) selecting an appropriate power. In order to increase the life of the power supply, a model with a maximum output power rating of 30% can be selected. (3) Consider load characteristics. If the load is a motor, a light bulb or a capacitive load, the current is large when the power is turned on. A suitable power supply should be used to avoid overload. If the load is a motor, consider voltage backflow at shutdown. (4) In addition, it is necessary to consider the working environment temperature of the power supply, and whether there is additional auxiliary heat dissipation equipment. In the case of excessively high temperature, the power supply needs to be derated. The derating curve of the ring temperature to the output power. (5) Select each function according to the application: Protection functions: over voltage protection (OVP), over temperature protection (OTP), overload protection (OLP), etc. Application functions: signal function (normal power supply, power failure), remote control function, telemetry function, parallel function, etc. Special features: power factor correction (PFC), uninterruptible power (UPS) Select the required safety and electromagnetic compatibility (EMC) certification.

    2018 07/26

  • The Newest 220*110*55mm Black Plastic Box With Switch ON/OFF
    The Newest 220*110*55mm Black Plastic Box With Switch ON/OFF no fans,natural cooling low power loss of high efficiency low noise and ripple each packing box all add to Pearl cottonon on the top and bottom of the power supply to provide shock resistance during transport. with PFC Function with Switch ON/OFF

    2018 07/19

  • 12v 15a power supply will delivery to Netherlands today
    One of my customer have order 12v 15a power supply from our company 15 days ago,and we have finished production today,so this afternoon 12v 15a power supply will delivery to Netherlands.

    2018 05/24

  • 100w power supply meet ETL standard
    Our company named Pengchu,we are manufacturer of power supply 5-550w for over 12 years,our 100w power supply have applied for ETL test in January,2017,now we have got the the ETL certification from the certification company,it means our 100w power supply meet ETL standard and our power supply is high quality.

    2018 05/09

  • ETL of factory inspection
    Our company have applied for ETL certification for our 100w power supply on January 11,2018. The certification company have come to our factory to inspect factory and factory inspection have approved today,so the ETL certification will complete soon.

    2018 04/28

  • 24v 10a 240w power supply have passed CE,UL certificate and meet DOE VI and CEC
    Shenzhen Pengchu industry CO;Ltd is one of power supply manufacturer in China,and we have 12 years experience at this industrial.We make a lot of power supply for every customer and we are make sure the quality of power supply to our customer.Our 24v 10a 240w power supply have started to test on Feb.2018,now we have get the CE,UL certificates,also DOE VI and CEC test approved.

    2018 04/18

  • all our power supply are renew for CE standard
    All power supply from Shenzhen Pengchu industry CO;Ltd are passed CE,FCC and ROHS certificates.Although the CE standard need to renew in once every five years and also our CE certification still in valid,but nowadays the CE certification standard in the European market has been updated, in order to meet the market demand,we also have to updated our CE standard to the latest standards. Therefore,our company contact the certification company to apply for updated the CE certification,so now we have get the latest standards of CE at the end of this March.

    2018 03/30

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