Under the tolerance of LED lighting projects in municipalities and public places such as “pilot project†and “face engineeringâ€, local high-power LED lighting technology is staggering forward. When can I use it commercially? Let us rationalize the development thinking of the local LED lighting industry from the following aspects.
Need to support the growth of local LED chip manufacturers to solve the cost problem Currently, a 3-watt LED light bulb in the Chinese market is priced at more than RMB 30 yuan, and the price of a 5-watt LED bulb is around RMB 40, which is measured at the current domestic market in China. The average luminous efficacy of LED lighting fixtures is about 60 lm/w, which is equivalent to 0.16 yuan/lm, which is a certain distance from the market target of 0.07 yuan (1 US cent)/lm required by the international market. For Japan, the country expects its LED lighting to reach the requirement of 0.07 yuan (1 yen)/lm in 2012.
Wen Maoqiang, chief technical officer of LED driver chip maker Long Express Integrated Circuit Design Co., Ltd. pointed out that at present, the cost of LED chips accounts for 70% to 80% of the cost of the entire LED lighting fixtures. Therefore, the cost of LED chips affects the cost of the entire LED lighting fixtures. To absolute control.
At present, Chang Yuntong is committed to the development of LED lighting projects. The LED chip manufacturers that are cooperating with them are mainly local manufacturers. “We are willing to cooperate with domestic LED chip manufacturers and grow together, considering the convenience of cooperation and delivery,†Wen Maoqiang said. In his opinion, Wuhan Diyuan's LED chip products with high-power LED chip production performance have performed well. Although Cree, Nichia, Lumileds and other manufacturers have achieved very good quality LED products, but according to many mainland Chinese manufacturers, may be based on the protection of the interests of large customers or local interests, many Taiwan, Japan manufacturers for the Chinese mainland Shipments of LED, compared with the mainland's outstanding LED products, the former quality does not have much advantage. Therefore, in order to make good high-power LED lighting fixtures, light dependence on LED chip imports is undesirable. From this perspective, local manufacturers still place high hopes on domestic LED chip makers.
So far, there have been about 40 LED chip makers in the mainland, and the scale, production capacity, and market demand are in a head-on collision. The date for the decline in the cost of LED chips is not far away. Only at the present stage, among all upstream manufacturers, only a few of Wuhan Diyuan, Shanghai Sapphire, and Guangzhou Jingke are the manufacturers of high-power LED chips. With epitaxial wafers imported from Taiwan, the United States, and other regions, it is necessary to reduce the number of local LEDs. The chip cost is not a problem that can be solved within a quarter or half a year.
LED lighting power supply life and efficiency into a dead end, try innovative ideas to overcome the difficulties "Compared with the development of domestic LED chip technology, local LED lighting power supply technology is still lagging." Wen Maoqiang said. As far as the author knows, the best life of domestic high-power LED lighting fixtures is about 30,000 hours, and the lifespan of the power module is the main factor determining the lifespan of LED lamps. To further improve the life of high-power LED lamps, technological breakthroughs have to be made in various aspects such as heat dissipation, selection of capacitor parts, and circuit layout.
However, at present, the power module life is a common problem faced by high-power LED lighting technology around the world. At present, the average lifespan of LED lamps for industrialization in Japan is only about 40,000 hours.
In addition, for the LED power supply module, the conversion efficiency is another bottleneck beyond the life of the application. The LED lighting power module is mainly composed of three parts: AC/DC, DC/DC, and LED. Among them, AC/DC and DC/DC have the largest power loss. About 20% of the power will be consumed here. This part of the power conversion efficiency has become the focus of many LED lighting power module manufacturers work. In the LED driving part, current constant-current driving is the main method, and the efficiency of the domestic constant-current driving chips is generally above 95%. "Constant current drive is not difficult." Huang Chaogang said. In his view, the low conversion efficiency of AC/DC and DC/DC is the fatal flaw of the LED power module.
Power module technology has become a dead end of high-power LED lighting technology. There is a lot of theoretical knowledge on how to improve this, but under the conditions of poor chip technology and poor application environment of LED lighting, it is not easy to seek greater improvement in the short term. Then, we may actively use some innovative thinking methods to look at the development of LED lighting power module technology, and perhaps cleverly achieve some unexpected results. The following gives two related examples.
Example 1: The long-distance distributed constant current technology advocated by Chang Yuntong aims to promote the industrialization of LED lighting. By binding the constant current source to the light source, Chang Yuntong completely separated the power module. "We will use 16 LED chips or 18 LED chips as a group, packaged on aluminum substrates, and then packaged with a good constant current source into the package. Customers can according to their actual needs of the LED lamp group series / parallel with On the power supply side, they only need to supply a certain DC power supply for the LED lamp group." Wen Maoqiang said: "In terms of power supply, customers can use our long-distance power supply modules, or follow their own power supply modules. It is more flexible and avoids the waste of resources that customers use to purchase different LED power modules for lamps with different appearances."
Example 2: For the current civilian lighting circuit structure, Seoul Semiconductor has innovatively introduced a patented technology. The unique feature of this technology is that it can directly drive LED chips with AC power. According to reports, this technology consists of two strings of lamps to complete the lighting work. During the positive half cycle of the alternating current, the A string lamp is lighted, and the B string light is lighted during the negative half cycle, thereby achieving zero loss of the power module and avoiding the power converter. The longevity of LED lamps has shortened their lifespan. However, this technology has a large waste of LED chips. Perhaps after the LED cost has dropped, the civil market with a stable power grid may accept the patented technology product.
At present, Chang Yuntong has applied for eight packages, architectures, and appearance patents for distributed constant current technology, and has also opened related production lines in Shenzhen and Dongguan. In Wen Maoqiang's view, this distributed constant current method can facilitate the domestic unified power supply specifications, and effectively integrate the local power supply design resources, thereby eliminating to a certain extent power supply module manufacturers from their own and independent standards. Market confusion. "Distributed constant current will effectively promote the domestic LED lighting industry process." Wen Maoqiang said.
Manufacturer self-discipline, with the third organization to improve product quality LED lighting power module manufacturers Zhang Mingmin, chairman of the World Technology Co., Ltd. also believes that for the domestic LED lighting industry, EMI / EMC and security issues is an open question. “The current market for LED lighting products has not been subject to any certification, and the 'pilot' project has facilitated the listing and use of these products. For the vast majority of domestic LED lighting power supply companies, to promote civilian use, the primary task to be solved It is not the so-called life and light efficiency problems. How to use the LED lamps for the safety and security of the people is the top priority of the current research and development work, said Zhang Yimin.
As a manufacturer dedicated to LED lighting technology, Huang Chaogang frankly stated that LED lighting is well promoted in public lighting applications such as street lamps, subways, shopping malls, and hospitals, because these regions have high requirements for energy saving, and LED lighting brings economic benefits. The benefits will be more obvious and the users will be more receptive. However, the electricity bill for households is not high enough. It is difficult for users to replace the existing energy-saving lamps at a high cost. Therefore, manufacturers all regard so-called "municipal projects" such as public lighting as their main market goals. “These public LED lighting projects are as a pilot project and image project, and their quality requirements are not strict. Even if the brightness is good enough, no major fault accidents can occur. As for other quality certifications, as long as they do not put on the supermarket to sell to the people, There is no hard requirement," Huang Chaogang pointed out. Therefore, in line with the development philosophy of quality first, Quanxin is particularly cautious in the development planning of LED lighting products. At present, its LED lighting application market mainly focuses on lawn lamps and MR16 products.
LED lighting power module also has a difficult to be overcome, that is, certification testing. At present, the vast majority of domestic LED lighting products have not obtained any certification, and most of us hold the luck in the government's "pilot" project. "If you don't talk about civilian use, then you will not consider testing and certification." This is the mentality of most LED lighting manufacturers, which is related to the lack of standardized management of the market.
At present, LED lighting related associations are being born and growing, these third-party agencies will assume the responsibility of regulating the market, to a certain extent, the development of the local LED lighting industry to bring new dawn. Therefore, LED lighting products urgently need industry standards, market access system to standardize management, so that it is conducive to the healthy development of the entire LED lighting industry.
Need to support the growth of local LED chip manufacturers to solve the cost problem Currently, a 3-watt LED light bulb in the Chinese market is priced at more than RMB 30 yuan, and the price of a 5-watt LED bulb is around RMB 40, which is measured at the current domestic market in China. The average luminous efficacy of LED lighting fixtures is about 60 lm/w, which is equivalent to 0.16 yuan/lm, which is a certain distance from the market target of 0.07 yuan (1 US cent)/lm required by the international market. For Japan, the country expects its LED lighting to reach the requirement of 0.07 yuan (1 yen)/lm in 2012.
Wen Maoqiang, chief technical officer of LED driver chip maker Long Express Integrated Circuit Design Co., Ltd. pointed out that at present, the cost of LED chips accounts for 70% to 80% of the cost of the entire LED lighting fixtures. Therefore, the cost of LED chips affects the cost of the entire LED lighting fixtures. To absolute control.
At present, Chang Yuntong is committed to the development of LED lighting projects. The LED chip manufacturers that are cooperating with them are mainly local manufacturers. “We are willing to cooperate with domestic LED chip manufacturers and grow together, considering the convenience of cooperation and delivery,†Wen Maoqiang said. In his opinion, Wuhan Diyuan's LED chip products with high-power LED chip production performance have performed well. Although Cree, Nichia, Lumileds and other manufacturers have achieved very good quality LED products, but according to many mainland Chinese manufacturers, may be based on the protection of the interests of large customers or local interests, many Taiwan, Japan manufacturers for the Chinese mainland Shipments of LED, compared with the mainland's outstanding LED products, the former quality does not have much advantage. Therefore, in order to make good high-power LED lighting fixtures, light dependence on LED chip imports is undesirable. From this perspective, local manufacturers still place high hopes on domestic LED chip makers.
So far, there have been about 40 LED chip makers in the mainland, and the scale, production capacity, and market demand are in a head-on collision. The date for the decline in the cost of LED chips is not far away. Only at the present stage, among all upstream manufacturers, only a few of Wuhan Diyuan, Shanghai Sapphire, and Guangzhou Jingke are the manufacturers of high-power LED chips. With epitaxial wafers imported from Taiwan, the United States, and other regions, it is necessary to reduce the number of local LEDs. The chip cost is not a problem that can be solved within a quarter or half a year.
LED lighting power supply life and efficiency into a dead end, try innovative ideas to overcome the difficulties "Compared with the development of domestic LED chip technology, local LED lighting power supply technology is still lagging." Wen Maoqiang said. As far as the author knows, the best life of domestic high-power LED lighting fixtures is about 30,000 hours, and the lifespan of the power module is the main factor determining the lifespan of LED lamps. To further improve the life of high-power LED lamps, technological breakthroughs have to be made in various aspects such as heat dissipation, selection of capacitor parts, and circuit layout.
However, at present, the power module life is a common problem faced by high-power LED lighting technology around the world. At present, the average lifespan of LED lamps for industrialization in Japan is only about 40,000 hours.
In addition, for the LED power supply module, the conversion efficiency is another bottleneck beyond the life of the application. The LED lighting power module is mainly composed of three parts: AC/DC, DC/DC, and LED. Among them, AC/DC and DC/DC have the largest power loss. About 20% of the power will be consumed here. This part of the power conversion efficiency has become the focus of many LED lighting power module manufacturers work. In the LED driving part, current constant-current driving is the main method, and the efficiency of the domestic constant-current driving chips is generally above 95%. "Constant current drive is not difficult." Huang Chaogang said. In his view, the low conversion efficiency of AC/DC and DC/DC is the fatal flaw of the LED power module.
Power module technology has become a dead end of high-power LED lighting technology. There is a lot of theoretical knowledge on how to improve this, but under the conditions of poor chip technology and poor application environment of LED lighting, it is not easy to seek greater improvement in the short term. Then, we may actively use some innovative thinking methods to look at the development of LED lighting power module technology, and perhaps cleverly achieve some unexpected results. The following gives two related examples.
Example 1: The long-distance distributed constant current technology advocated by Chang Yuntong aims to promote the industrialization of LED lighting. By binding the constant current source to the light source, Chang Yuntong completely separated the power module. "We will use 16 LED chips or 18 LED chips as a group, packaged on aluminum substrates, and then packaged with a good constant current source into the package. Customers can according to their actual needs of the LED lamp group series / parallel with On the power supply side, they only need to supply a certain DC power supply for the LED lamp group." Wen Maoqiang said: "In terms of power supply, customers can use our long-distance power supply modules, or follow their own power supply modules. It is more flexible and avoids the waste of resources that customers use to purchase different LED power modules for lamps with different appearances."
Example 2: For the current civilian lighting circuit structure, Seoul Semiconductor has innovatively introduced a patented technology. The unique feature of this technology is that it can directly drive LED chips with AC power. According to reports, this technology consists of two strings of lamps to complete the lighting work. During the positive half cycle of the alternating current, the A string lamp is lighted, and the B string light is lighted during the negative half cycle, thereby achieving zero loss of the power module and avoiding the power converter. The longevity of LED lamps has shortened their lifespan. However, this technology has a large waste of LED chips. Perhaps after the LED cost has dropped, the civil market with a stable power grid may accept the patented technology product.
At present, Chang Yuntong has applied for eight packages, architectures, and appearance patents for distributed constant current technology, and has also opened related production lines in Shenzhen and Dongguan. In Wen Maoqiang's view, this distributed constant current method can facilitate the domestic unified power supply specifications, and effectively integrate the local power supply design resources, thereby eliminating to a certain extent power supply module manufacturers from their own and independent standards. Market confusion. "Distributed constant current will effectively promote the domestic LED lighting industry process." Wen Maoqiang said.
Manufacturer self-discipline, with the third organization to improve product quality LED lighting power module manufacturers Zhang Mingmin, chairman of the World Technology Co., Ltd. also believes that for the domestic LED lighting industry, EMI / EMC and security issues is an open question. “The current market for LED lighting products has not been subject to any certification, and the 'pilot' project has facilitated the listing and use of these products. For the vast majority of domestic LED lighting power supply companies, to promote civilian use, the primary task to be solved It is not the so-called life and light efficiency problems. How to use the LED lamps for the safety and security of the people is the top priority of the current research and development work, said Zhang Yimin.
As a manufacturer dedicated to LED lighting technology, Huang Chaogang frankly stated that LED lighting is well promoted in public lighting applications such as street lamps, subways, shopping malls, and hospitals, because these regions have high requirements for energy saving, and LED lighting brings economic benefits. The benefits will be more obvious and the users will be more receptive. However, the electricity bill for households is not high enough. It is difficult for users to replace the existing energy-saving lamps at a high cost. Therefore, manufacturers all regard so-called "municipal projects" such as public lighting as their main market goals. “These public LED lighting projects are as a pilot project and image project, and their quality requirements are not strict. Even if the brightness is good enough, no major fault accidents can occur. As for other quality certifications, as long as they do not put on the supermarket to sell to the people, There is no hard requirement," Huang Chaogang pointed out. Therefore, in line with the development philosophy of quality first, Quanxin is particularly cautious in the development planning of LED lighting products. At present, its LED lighting application market mainly focuses on lawn lamps and MR16 products.
LED lighting power module also has a difficult to be overcome, that is, certification testing. At present, the vast majority of domestic LED lighting products have not obtained any certification, and most of us hold the luck in the government's "pilot" project. "If you don't talk about civilian use, then you will not consider testing and certification." This is the mentality of most LED lighting manufacturers, which is related to the lack of standardized management of the market.
At present, LED lighting related associations are being born and growing, these third-party agencies will assume the responsibility of regulating the market, to a certain extent, the development of the local LED lighting industry to bring new dawn. Therefore, LED lighting products urgently need industry standards, market access system to standardize management, so that it is conducive to the healthy development of the entire LED lighting industry.
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