LED Display Power Supply

LED display in the led chip is a characteristic sensitive semiconductor component, and has a negative temperature characteristic, and therefore in the application process needs led display power supply (HS Code: 8504401400) to be stable working condition and protection, it is because of this that the concept of drive. LED display devices on the drive power requirements are close to the harsh, led is not like ordinary incandescent bulbs, can be directly connected to 110V/220V led is 3 ~ 5 volts of low voltage drive, must be designed to complex conversion circuit, different uses of led lights, to be equipped with different power supply/power adapters.

Foreign customers in the international market for led display drive power efficiency conversion, effective power, constant current accuracy, power life, electromagnetic compatibility requirements are very high, design a good power supply must be a comprehensive consideration of these factors, because the role of the electronic power supply for led in the entire led display is as important as the human heart.

1. LED Display Constant Current Drive Requirements:

LED driver circuit in addition to meet the safety requirements, in addition to the basic function should be two aspects.

•  1). Is as far as possible to maintain constant-current characteristics, especially in the power supply voltage changes of ± 15%, should still be able to maintain the output current in the range of ± 10% change.

The main reason is A, to avoid driving current beyond the maximum rated value, affecting its reliability. B, to obtain the expected brightness requirements, and to ensure the consistency of each led brightness, chromaticity.

•  2). Is the drive circuit should maintain a low power consumption of their own, so that the led system efficiency to maintain a high level.

2. Constant Current Drive Characteristics:

According to the power rules of the grid and the characteristics of the led drive power requirements, the following points should be considered when selecting and designing the led drive power.

•  1). High reliability: especially like the led streetlight drive power supply, installed in the high altitude, maintenance is not convenient, the cost of maintenance is also large.

•  2). High efficiency: led is an energy-saving product, the efficiency of the drive power supply should be high. For the power supply is installed in the structure of the lamp, especially important. Because the luminous efficiency of the led decreases as the temperature of the led rises, so the heat dissipation of the led is very important. High efficiency led power supply, its power dissipation is small, the heat generated in the lamps and lanterns is small, it also reduces the temperature rise of the lamps and lanterns. Beneficial to slow down the light decay of led.

•  3). High power factor: power factor is the requirements of the grid to the load. General 70 watts or less of appliances, there is no mandatory indicators. Although the power of a small single appliance power factor is a little lower on the grid, but at night everyone lights, similar load is too concentrated, will produce more serious pollution on the grid. For 30 watts ~ 40 watts of led drive power supply, it is said that soon, perhaps there will be certain indicators of power factor requirements.

•  4). Combination of flexible, one way led failure, does not affect the work of other leds, but the cost will be slightly higher. The other is a direct constant-current power supply, led series or parallel operation. It has the advantage of a little lower cost, but poor flexibility, but also to solve a led failure, does not affect the operation of other led display accessories. These two forms, over a period and co-exist. Multiple constant current output power supply method, in terms of cost and performance will be better. Perhaps the mainstream direction in the future.

•  5). Surge protection: led anti-surge capability is relatively poor, especially the ability to resist reverse voltage. Strengthen this aspect of protection is also very important. Some led lights installed in the outdoors, such as led streetlights. Due to the grid load start dumping and lightning induction, from the grid system will invade a variety of surges, some surges will lead to damage to the led. Therefore, the led driver power supply to have the ability to suppress the intrusion of surges, to protect the led from being damaged.

•  6). Protection function: In addition to the conventional protection function of the led power source, it is best to increase the led temperature negative feedback in the constant current output to prevent the led temperature is too high.

•  7). Protection: outside the installation type of lamps and lanterns, power supply structure to waterproof, moisture-proof, the shell should be sun-resistant.

•  8). The life of the driver power supply to match the life of the led.

•  9). To meet the requirements of safety regulations and electromagnetic compatibility.

LED’s application range and use are increasingly widespread, led power supply and driver performance will be more and more suitable for the requirements of led, then the performance of led display will also gradually improve and stable, which is the progress of the industry.

3. How to Choose LED Display Power Supply?

LED display power supply as an important part of the power supply system to provide, choose a qualified and reliable power supply, led display energy-saving effect and service life are obvious to enhance the effect, then how to correctly identify and choose a qualified led display power supply?

•  1). Look at the appearance of the process to choose the led display power supply. A good power supply manufacturer, its workmanship is also very strict, because this can guarantee the consistency of the product batch. An irresponsible manufacturer, the production of power supplies its appearance, tin surface, the neatness of the arrangement of components * will not be good.

•  2). Select the led display power supply from the full-load efficiency. The efficiency of the power supply is an important indicator, high efficiency of the power supply energy conversion rate is high, so that both attached to the requirements of energy conservation and environmental protection, but also can save power and money for the user.

•  3). Constant voltage power supply output voltage ripple is large. The size of the ripple has a very large impact on the life of power equipment, the smaller the ripple the better.

•  4). Observe the temperature rise of the us led power supply to choose the led display power supply. Temperature rise affects the stability and life of the power supply, the lower the temperature rise, the better the temperature rise. In addition, from the efficiency can also be seen, the general efficiency of high temperature rise will be small.

•  5). Due to the properties of led display products, in the playback of video or screen usually produces instantaneous changes in current, which puts forward more stringent requirements for the led power converter. Usually, to ensure the normal broadcast of the display screen, the power supply products need to set aside a certain amount of margin. In a general sense, the more margin reserved, the more stable the performance of the led driver power supply products, the longer the life, but this increases the cost of power supply products, too much margin reserved also easy to cause waste. Currently, the industry’s led display power supply is generally reserved for 20% – 30% of the margin.

•  6). To make the life of the power supply grow, it is recommended to use 30% more output power rating of the model. For example, if the system requires a 100W power supply, it is recommended to select a model with an output power rating greater than 130W, and so on to effectively enhance the life of the power supply.

•  7). According to the application field to choose the power supply of various functions, such as protection functions: over-voltage protection, over-temperature protection, overload protection, etc.; application functions: signal function, remote control function, telemetry function, parallel function, etc.; special features: power factor correction (PFC), uninterruptible power supply (UPS).

4. Commonly Used LED Display Power Supply Brands:

Meanwell Enterprise Co., Ltd (its website “MEAN WELL”) was founded in 1982, is one of the world’s few standard product power supply-based professional manufacturers. According to Micro Technology Consultant’s report in March 2021, Meanwell ranked 4th in the global power supply (DC output) manufacturer ranking, most of the top 3 power supply manufacturers have ODM/OEM as their main source of revenue, while 99% of Meanwell’s revenue comes from standard power supplies. The main business strategy of Meanwell is to be a power supply manufacturer.

Meanwell led driver has become a professional power supply brand manufacturer with consolidated revenue of over $1.015 billion in 2020, with branches and offices in Guangzhou, Shenzhen and Suzhou, China, California, USA and Holland, Europe, and 2800 employees worldwide. We have four manufacturing facilities located in New Taipei City, Taiwan, Huadu District, Guangzhou, Xiangcheng District, Suzhou and Bangalore, India.

The product line includes AC/DC switching power supplies, DC/DC converters, led waterproof sources, led ac adapter, battery chargers, and DC/AC inverters. There are more than 10,000 models, which are widely used in medical, industrial automation, electronics, communication, led lighting, transportation, and other industries, fully satisfying designers’ one-stop shopping needs and different application methods; and our led display conventional shape numbers are LRS-200-5CCG, LRS-350-5CCG, RSP-200-5(110/220V), RSP-320-5(110/220V), HSP-200-5 Narrow(110-220V), HSP-300-5 Narrow(110-220V) and led power supply 12V.

Changzhou Chuanglian Power Technology Co. (CZCL) covers an area of 20,000 square meters, with a plant area of 22000 square meters, registered capital of 60 million RMB and more than 600 employees in production.

Chuanglian specializes in the development, manufacture, and sales of led display power supply, landscape lighting power supply, waterproof drive power supply, led power converter, industrial control power supply and other products. The products cover more than 2000 specifications and varieties. After years of development, Chuanglian has grown into an excellent enterprise with an annual output of more than 18 million units of various power supplies.

The brand of “Chuangjin” mainly focuses on the middle and high-end market, which is well known in the industry at home and abroad and deeply loved by customers; the brand of “Soslid” is a high cost-efficiency experience product, which is a powerful tool for channel wholesale; “Soslid” is its high-end brand, which is also highly recognized in the industry at present. recognition. Most of our products are certified by 3C/UL/CE/CB/FCC/KC/BIS and other countries, which are exported to more than 50 countries and regions in Europe, America, Africa, Latin America, the Middle East, and Southeast Asia, in addition to meeting the needs of the domestic market.

Shenzhen Chenglian Power Supply Co., Ltd. was founded in 2001, is a high-tech enterprise specializing in R&D, manufacturing, and sales of AC/78DC and DC/DC series switching power supplies. The company is in Changzhou High-tech Industrial Development Zone, Jiangsu Province, and is now a member of China Power Supply Society, a director of China Optoelectronics Association, and a member of China Lighting Society. Quality, technology, and team are the core advantages of Chenglian power supply.

Chenglian led power supply products are widely used in led display, led lighting, landscape engineering, exhibition display, signage, communication, electric power, instrumentation, security monitoring, medical equipment, automation, CNC systems and other fields. They are exported to USA, Germany, Singapore, Turkey, Australia, South Africa, and other countries. Chenglian Power Supply has established sales outlets in all major and medium-sized cities in China, and the headquarters as well as the sales outlets maintain a certain number of standard products in stock to ensure timely satisfaction of customer needs.

Shenzhen G-energy Technology Co., Ltd. was established in 2011, It is a national high-tech enterprise integrating R&D, production, and sales, bringing together senior R&D and management personnel from many famous power supply companies at home and abroad, with professional development and production capacity. The company has passed ISO9001 quality management system certification, all products comply with the EU ROHS & WEEE directives, and some products have passed UL, TUV, CCC, CE, ETL and other certifications. G-energy products have a great influence in the domestic and international markets, and we have been leading the industry in sales for many years and have cooperated with many international famous enterprises and institutions.

The company is a “national high-tech enterprise”, is the vice president of the Shenzhen Semiconductor Industry Association, the company currently has four series of power supplies: 1, led display ultra-thin power supply series; 2, led lighting and lighting power supply series (including waterproof power supply and dimming power supply, 12-volt power supply for led lights); 3, industrial control and communications power supply; 4, modular power supply. JNWEI has invested heavily in introducing the most advanced production equipment in the market, including ATE automatic test instruments, high and low temperature cycle furnace, and infrared temperature tester.

With solid basic technology and outstanding innovation and R&D capability, we are now able to develop power supplies of various specifications to meet customer requirements within one month. Application cases include: 2021 Jingdong 11.11 Boiling Night, National Day 70th Anniversary Parade Field of Hope Float, National Day 70th Anniversary Parade Beijing 1 Float, Asian Culture Carnival, Nanjing TV Studio, The Voice of Spain, Beijing Jingdong Headquarters, Shandong Daming Lake, China Film Festival, CITIC Plaza, Jiangsu TV Tower, Shenzhen North Station, Brazil World Cup Maracana Stadium, etc.

Shenzhen Pudexinxing Power Technology Co. Founded in 1991, is one of the largest manufacturers of leading brands of switching power supplies in China. In 2002, the company successfully passed the German TUV ISO9001 quality management system and TUVISO14001 environmental management system certification.

Xinxing now has more than 2000 standard models, including industrial power supply, led power supply, communication power supply, automation equipment power supply, security power supply, rgb controller power supply; products are widely used in industrial automation (CNC, laser, electric control machinery, etc.), communication (switch, POE, base station, etc.), led light power supply and display, medical, security and other industries.

Shenzhen Hwa-power Co., Ltd. was established in 2011. As a national high-tech enterprise, Hwa-power focuses on the R&D and production of led display drive power supplies. In the early days of the industry, Hwa-power formulated corporate standards based on the characteristics of led display products, including 1mA leakage current, 12v led psu, 200mV output voltage ripple, and output voltage ratings (3.8V, 4.2V, 4.6V, 5V) gradually Accepted by peers and become the industry standard.

According to the positioning of the high-end power supply, the box-type power supply housing and the bright silver sandblasting oxidation process were first introduced; the LLC resonant topology was first introduced to solve the whistling sound problem commonly seen in the early led drive 79 power supply in the industry; according to the led display The power supply has the characteristics of large dynamic output current and high current, and the solid output filter capacitor was first introduced to solve the problem of power supply life.

According to the characteristics of high-end led display products, it is the first to introduce busbars and hard-wire technology to the industry; according to the characteristics of the global use of rental screens, it is the first to propose that the power supply is 110VAC and 220VAC voltage input, and the output will not be derated under full temperature working conditions; In order to meet the application requirements of the led industry, Hwa-power has continuously led the development of the industry in power supply thicknesses ranging from 26mm, 19mm to 13mm.

Hwa-power pays attention to technological innovation, deeply meets the requirements of led display for power supply, and continuously introduces power products with excellent performance, maintaining its leading position in the industry.

Shenzhen Rong Electric Innovation Technology Co., Ltd. has been committed to the R&D and manufacturing of led display power supplies, led lighting power supplies, industrial equipment power supplies, audio power supplies and car power supplies since 2006. Since 2013, the shareholding system reform has been implemented and the registration has been reorganized. With the “Rong Electric” brand as the market orientation, the company has a comprehensive operating system nationwide in the production and sales of various power sources.

Meet the various needs of customers in power supply design and production. Rong electric has passed the (SGS) ISO9001:2008 version of the system certification. “Excellence and continuous improvement” of quality is the company’s consistent belief. “Honesty and trust” is also a solid cornerstone for the company’s sustainable development and sustainable operation.

Shenzhen Megmeet Electric Co., Ltd. (listed on the Shenzhen Stock Exchange, stock code: 002851) was established in 2003 with a registered capital of 497 million yuan. It is a company with power electronics and industrial control as its core technology, engaged in electrical automation software and hardware and a high-tech company that develops, produces, sells and services system solutions. The company’s business covers display power supplies, industrial power supplies, industrial automation, new energy vehicles and rail transit, smart home appliances and high-end smart manufacturing.

Headquartered in Shenzhen Science and Technology Park, it has more than 5,000 employees, and its business is oriented to more than 40 countries and regions around the world. The company is committed to the more efficient use of electric energy by humans, continuous improvement of production efficiency, cleaner living environment, and increasingly better human life.

Changsha Hangte Electronic Technology Co., Ltd. was established in July 2010, located in Ningxiang High-tech Industrial Park, Changsha City, Hunan Province. It is a high-tech enterprise focusing on the sales, R&D and manufacturing of switching power supplies. The company has its own core technology and intellectual property rights and has applied for several patents. It has a high-level research and development team in the industry and has established industry-university-research cooperation with National University of Defense Technology and Central South University to independently develop more than 1,000 power supply products.

The products are mainly used in power meters, industrial control, led screen displays, logo lighting, national defense and military industries, and new energy. They have the characteristics of high reliability, low ripple, high precision, small size, and high efficiency. The company has established a strict product development management process and ISO9001 quality management system and has an advanced automated manufacturing line in the industry, with an annual production capacity of 10 million power supplies.

Delta Electronics Industry Co., Ltd. was established in 1971. The group is headquartered in Neihu District, Taipei City, Taiwan. In addition to setting up factories in southern, central, and northern China, it also has facilities in the Americas, Europe, Japan, Thailand, and Singapore. Multiple production plants, sales offices, and product development centers.

Delta Electronics has been committed to the research and development of new products and new technologies. It is currently the world’s leading manufacturer of power supply systems for computers, communications and networks, and a major supplier of displays, electronic components, and network products worldwide.

Delta’s outstanding performance in product development, production management and mass production capabilities has been recognized and praised by the industry and cited as a model. Its outstanding quality and highly reliable service have been praised by companies such as HP, Intel, IBM, DELL, Gateway, GE, Northern Communications, Fujitsu, Mitsubishi, NEC, etc. of the United States for many times. At the same time, Delta is a qualified manufacturer certified by ISO-9001 and 14001.

Shenzhen Nandian Chuangyu Technology Co., Ltd. has been committed to the R&D and manufacturing of led display power supplies, led high-end commercial lighting power supplies, industrial equipment power supplies, industrial communication power supplies, new energy charging power supplies, module power supplies, and car power supplies since 2013. Since 2018, the company has implemented shareholding reform and reorganization and registration.

With the “Nandian Chuangyu” brand as the market orientation, the company has passed ISO9001: 2015/GB/T19001 2016 quality management system certification. Ndcy-power now has a marketing department, a research and development department, and an engineering department. Department, Quality Department, Material Department, Purchasing Department, Production Department, etc., comprehensive system management to meet the various needs of customers in power supply design and production.

With the continuous development of society, led display power supplies, led high-end commercial lighting power supplies, industrial equipment power supplies, industrial communication power supplies, new energy charging power supplies, module power supplies, and vehicle power supplies will be more and more widely used.

You-yi Power Co., Ltd. was established in September 1989, with subsidiaries Shenzhen You-yi Power Co., Ltd. and Anhui Fuande Import and Export Co., Ltd., and invested in Tianqin Co., Ltd. The company covers an area of 30,000 square meters, with a plant area of 22,000 square meters. It specializes in the research and development and manufacturing of power supplies. The products cover led power supplies, charging power supplies, industrial control power supplies, communication power supplies, led power adapter, laser power supplies, CCTV power supplies and constant current power supplies. The current annual output is 200 million units. Products are exported to the Middle East, Europe, America, and Southeast Asia. After years of hard work and hard work, Friendship Power has been favored and recognized by customers.

You-yi Power has always been responsible to customers and society, and strictly follows industry standards from raw material purchase, production management to finished product manufacturing. The company has SM421 placement machine and reflow soldering. To ensure that every product sold can have quality assurance, it continuously introduces internationally advanced equipment and instruments from Japan, Taiwan, Germany, and other places. High-quality products have high-quality products. Certifications: ISO 9001 quality management system certification, CCC certification, CB certification, UL certification, FCC certification, CE certification, ROHS certification, CTI certification and VDE certification.


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