Led Driver: Lighting Applications Is Still Optimistic About Heat Problem

LED Lighting has shown great potential, but their applications in different levels

of development is not balanced, therefore, different areas of the drive circuit market performance has been mixed. Hangzhou Silan Microelectronics Electronic Power and power-driven product line general manager Jian-Xing Wu in the "China Electronics News" interview, said, LED lighting market is the main obstacle to high costs, so the first LED lighting will be relatively insensitive to the cost to develop the field, such as landscape lighting, street lamps and lights, etc.; Hangzhou Monolithic 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 are still concentrated in the municipal engineering, large-scale access to the general civilian areas may also need to 3 to 5 years.

Semiconductor and portable power products worldwide Sell And marketing director Zheng Zhaoxiong also expressed to reporters on the LED lighting market, the company's attention, he said: "ON Semiconductor will give full play to the company in the field of power management expertise and high-volume manufacturing capabilities, as Car Lighting, commercial lighting, outdoor lighting and general illumination LED drivers and other applications programs. "

Technically, lighting applications LED drive circuit is 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, IC Design, thermal management, packaging and optoelectronic integration of advanced technology and many other advanced manufacturing technologies. "" Compared with developed countries, China in the field of lighting LED driving a late start and the weak basis, the lack of core technologies with independent intellectual property rights. "Michael said," At present, the drive for high-power LED IC Chip technology by several major European semiconductor monopolized by large companies, especially applied to 25W ~ 100W power range of residential lighting and 100W output power over the main road lighting, the need to use isolation flyback converter, so Only a few companies to master the technology. "According to Michael introduced for incandescent dimmer resistive TRIAC difficult to CFL, LED normovolemic Light Sources Be dimmed, it has been a bottleneck in LED driver technology, Crystal Kay has developed technology used in 110V ~ 260V AC lighting applications, made its first AC / DC high voltage chip, with the precise number of unique dimming ballast technology breakthrough The bottleneck to achieve high energy consumption can be a direct replacement for incandescent lamps, LED can achieve freedom with the TRIAC dimmer resistive purpose use.

Distinctive indoor and outdoor applications street lighting needs to adapt to harsh environment

indoor applications should consider the compatibility

In LED lighting applications, 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.

Any distance from the angle of product structure, explained to reporters outdoor and indoor lighting LED driver circuit of difference, he said: "The street lighting using three-tier, that is, 'PFC (power factor correction) + isolated DC / DC transformation constant current device + buck converter '. usually before the two companies from the power supply design and production, is a relatively independent power supply, providing a stable DC voltage to the lamps, while the third level by the LED system manufacturers own design, and lighting constitute a whole. The third stage circuit and the heat because of the LED with severe to require high conversion efficiency. indoor lighting is usually single-level structure, although the need for PFC has not yet conclusive, but the trade has been generally felt that if the traditional Replace all incandescent LED, harmonic pollution on power quite a lot, so PFC is necessary; existing incandescent and fluorescent lamps and dimmers are installed is complete, and dress up the LED lamps must be able and original dimmers matching; In addition, depending on the application, the drive circuit can be isolated or may not isolation. "

To be done to extend the life of

solve cooling problem is the key to extend the LED life

LED device protection thermistor assume responsibility

LED product life is of great concern to consumers, and even view a short piece of driving circuit boards for LED products have become "short-lived." Zheng Zhaoxiong told reporters: "LED product itself has a long life, low reliability if the drive circuit will affect their life, thereby affecting the life of the entire lighting system. To provide high reliability of the drive circuit itself is not difficult The hard part is maintaining the high reliability while lowering costs. Therefore, the designer select the appropriate LED drive and external components is particularly important to ensure that the drive circuit and LED reliability and life of the reliability and life match. "appears in Lee Peng to solve life problems is subject to the power according to the different devices to be selected, he said, according to the power from low to high, respectively non-isolated step-down, isolated flyback PSR, single stage flyback, quasi-resonant, and LLC half-bridge topology to achieve higher efficiency, constant current control to achieve precise. "In the lighting field, the drive circuit challenge is how to solve the heat problem." Remote office, said, "If the poor heat dissipation, the circuit electrolytic capacitor will greatly reduce the life, will seriously affect the life span of LED products. Solutions include improve the driving circuit efficiency and cooling capacity, in the circuit through a number of unique design can even remove the electrolytic capacitor. "Jian-Xing Wu believes that, LED lighting is a system, the LED, electronic systems, cooling systems etc., these three are inseparable; LED life requires a stable input voltage, constant output current, lower than 60 of ambient temperature can be reflected.

Addition to increasing system efficiency, the industry has to consider

by: heiyou

POST COMMENT

The Ups And Downs Of Home Solar Energy How Learning New RSI Concepts Can Turn Your Trading Around Overnight How To Buy Soleus Air Dp1-70-03 Portable Energy Star Dehumidifier On Sale Pacific Timesheet Announces New Customers Mini IVF Treatment – Pros and Cons of This Revolutionary New In Vitro Fertilization Treatment Finding Boston Luxury Rentals For Your New Move Plans In Getting An Energy Efficient Dwelling The Diocese Of New York :one Of The Old Catholic Church Web Hosting And Seo Marketing Tips For New Online Businesses Keep Your Family Close And Find New Member With A Family Social Network Turbosmart Comp-Gate40 External Wastegates! A Bright Day for Solar Power CFL and LED Energy Efficient Light Bulbs