LED driver: lighting applications heat dissipation is still bullish technical di
High threshold lighting drive technology
● LED lighting into the general civilian areas needing
● key technology by foreign monopoly
LED lighting has already shown great potential, but in different application areas of their development level is not balanced, therefore, different areas of the drive circuit market performance has been mixed. Hangzhou Silan Microelectronics Co. power and power-driven product line general manager Jian-Xing Wu in the "China Electronics News" interview, said, LED lighting market, a major obstacle to the development of high costs, so the first LED lighting costs will be relatively insensitive to the development of the field, such as landscape lighting, street lamps and lights, etc.; Hangzhou Mao Semiconductor Technology Co., Ltd. General Manager of R & D center in Hangzhou cum MPS remote office also expressed a similar view, in his view, limited by high prices, LED lighting applications is still concentrated in the municipal engineering on a large scale into the general civilian areas may also need 3 to 5 years.
Semiconductor power and portable global sales and marketing director Zheng Zhaoxiong also expressed to reporters on the LED lighting market, the company's attention, he said: "Semiconductor companies will give full play to the field of power management expertise and high-volume manufacturing strengths, as auto lighting, commercial lighting, outdoor lighting and general LED lighting and other applications driven program. "
Technically, application of the LED lighting driver circuit also put forward higher requirements. Fairchild PCIA lighting director Lee Peng told reporters: "LED lighting driver circuit more and more focus on the stability of the brightness and power conversion efficiency, the pursuit of higher efficiency, higher integration and smaller form factor." On the system , the high-power LED lighting technology involves electrical, optical, thermal, mechanical and other disciplines, Crystal Kay Technology Co., Ltd. Wuxi, Chairman Dr. Huang Wei told reporters: "From the point of view to achieve a means, LED lighting technology includes power devices and high suppression of process technology, power integrated circuit design, thermal management, advanced packaging and optoelectronic integration technology and many other advanced manufacturing technology. "" Compared with developed countries, China in the field of lighting LED driving a late start and the weak base, lack of core technologies that have independent intellectual property rights. "Michael said," now used for high-power LED driver IC chip technology by several major European semiconductor monopolized by large companies, especially applied 25W ~ 100W power range of residential lighting and the output power of 100W or more of the main road lighting, the need to use isolation flyback converter, only a few companies to master the technology. "According to Michael introduced for the incandescent lamp dimming resistive TRIAC device is difficult to CFL, LED power light source such as capacitive dimming, LED drive technology that has been the bottleneck, Crystal Kay has developed technology used in 110V ~ 260V AC lighting applications, made its first AC / DC high voltage chip, to a number of Exact original dimming ballast technology, breaking the bottleneck, to directly replace incandescent lamps with high energy consumption and achieve free with resistive LED Dimmer TRIAC use purposes.
Distinctive indoor and outdoor applications
● street lighting needs to adapt to harsh environment
● indoor applications should consider the compatibility
Applications in LED lighting, outdoor lighting and indoor lighting the way in driving significant difference. According to Jian-Xing Wu description, street by AC power supply, AC to DC needs to be further controlled to achieve constant current. Lamp output power, the worst work environment, need to consider the extreme temperature conditions, taking into account the cost of street maintenance, high reliability requirements; relative to street lamps, the interior lighting power is small, relatively good working environment, However, cost sensitive, but also must take into account the compatibility with the original lighting interface, the volume of products have strict requirements.
Distance from any point of the product structure explained to reporters outdoor and indoor lighting LED driving circuit difference, he said: "The street lighting using three-tier, that is, 'PFC (power factor correction) + isolated DC / DC converter + drop Voltage and Constant Current Converter '.
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