Ashineon Liu Guoxu: DOB is rapidly becoming the new choice of LED lighting applications

"DOB technology is rapidly becoming the new choice of LED lighting applications, although not as SMD or other traditional forms of penetration so fast, but will occupy a space for one person, is expected within the next few years, DOB will reach more than 20% market share. "Sponsored by LEDinside, LED and Chinese Guangzhou International Lighting Exhibition in June 11th LEDforum2016 LED China international market trends Forum, ashineon executive vice president and chief technology officer Liu Guoxu mentioned in his speech.

DOB, which is based on AC high voltage drive integrated DOB module light source, has attracted the attention of many designers. In fact, DOB is not new, a few years ago has begun to enter the international market, and mass production, including OSRAM, Samsung, LGIT have launched their products.

Liu Guoxu pointed out in his speech, efficient driving IC and high voltage LED are the elements of the DOB. LED drive in the lamp cost accounted for about 20%, not only affect the cost, but also affect the light effect, also determines the life of the LED lamp.

Cost analysis model of A19 bulb lamp

The traditional AC - DCDriver topology has many kinds, for example, isolation drive, with many devices, large size, complex assembly, high cost, stability and security, etc.. Other methods also have different structures, including the choice of Buck - Boost structures, which require large capacitive inductance components. Relatively cheap is the resistance capacitance step-down power supply, low cost, but also low reliability.

AC - DCDriver topology

From the topology of the DirectAC package, many manufacturers have launched ACLED or DOB, using anti parallel the traditional structure of the hybrid bridge structure, also use the external bridge ashineon using AC linear drive. With the existing AC-DC converter (switching power supply) compared to the AC linear drive can be directly connected with the commercial power, no external circuit is very compact, easy integration, adjustable light, and very flexible, longer service life, because it contains no electrolytic capacitor, the extra space can be used to make the heat dissipation, lower cost components. The quantity is less, the assembly cost is very low. With the large number of production driven chips, the overall cost will be significantly reduced.

Liu Guoxu believes that DOB can provide new flexibility for the lamp, if the appropriate AC design, you can solve the stroboscopic problem. Due to the simplicity of the DOB and the integration of different gateways connected sensing, the future of DOB in the field of smart lighting will also occupy a place.

In addition to DOB, Liu Guoxu also talked about other technology trends, for example, high color rendering index, high efficiency LED technology to be a breakthrough (the key of narrow spectrum of red fluorescent powder or quantum dots into); health and enhance the efficiency of artificial lighting to replace energy, become the new market demand impetus; intelligent lighting is faster than the imagination, from daily life more and more close; silicon LED won the national science and technology award, become the industry focus again; focus from the CSP package, backlight and flash, used in lighting.

LED market trends, Liu Guoxu summed up the five points: first, LED prices continue downward but the decline has slowed down, and gradually return to quality concerns; two, the upper and middle reaches of the big capacity continues to increase, more; three, cross-border and overseas mergers and acquisitions, emerging markets become a trend which cannot be halted; four chase hot market segments; five, a new opportunities (ultraviolet, visible light communication plants, etc.). (finishing: LEDinsideNicole)

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