Wuhan Diyuan: HV LED chip is expected to become the mainstream of the market
High-tech LED network news (Reporter Tang Guirong) In the first half of 2010, Cree, Nichia and Lumileds announced the development of HV LED (high voltage) chips. In October of the same year, the wafers introduced blue 1W, 50V, 20mA chips and high-brightness red. 0.7W, 35V, 20mA chips, the release of these two high-voltage chips, marking the LED lighting application into the era of direct drive of the city.
Due to the high driving current, the low-voltage chip has low AC-DC conversion efficiency. During the application process, the voltage fluctuates greatly, causing the internal current to fluctuate too much and is easy to burn. The HV chip has the advantage of being easy to design the power supply, simplifying the internal design by increasing the current output, not only reducing costs but also improving efficiency.
Although low-DC chips currently dominate the market, the reduction in production costs of HV chips and the simplification of their processes have attracted many companies. "HV LED chip is a direction of chip development, and will become the mainstream in the future," said Ai Changtao, manager of Wuhan Diyuan Extension Department, to Gaogong LED reporter.
Technological breakthroughs HV chips are getting focus
The concept of HV LED chip first started from Taiwan, and basically mastered the core technology patent. At present, in addition to the wafer can master the high-voltage LED chip technology and achieve mass production, Jingdian, Diyuan, Jingke, etc. are also developed on the original chip structure. High-voltage chips and mass production.
Since last year, some Taiwanese companies have introduced high-voltage HV chips. LED epitaxial wafer factory crystal power developed high-voltage LED cold white light products, luminous efficiency increased to more than 160 lm / W, high-voltage warm white LED products luminous efficiency of 170lm / W level, and achieve a small shipment. This year, Jingdian's high-voltage LED chip (HV) successfully entered the international LED lighting manufacturer Philips supply chain, and shipped in large quantities from April.
The development of HV chips continued to rise, causing domestic chip companies to stir up. The HV high-voltage chip independently developed by Wuhan Diyuan has a mass production efficiency of 115 lm/W and a theoretical luminous efficiency of 130 lm/W. It is understood that in May of this year, the high-voltage chip of the crystal-chip flip-chip structure has been sampled, and mass production has begun. "We pull the wire directly on the substrate without the wiring and leads of the formal structure, and the process is simpler." Dr. Zeng Guang, director of chip engineering at Jingke Electronics (Guangzhou) Co., Ltd., told Gao Gong LED reporter.
The difficulty in developing HV lies in the series connection. How to realize the chip string hook, the string hook of the traditional package link is often a separate chip for series connection, and the high voltage chip is designed as a series mode, and the series HV LED chip makes the light distribution more flexible.
It is understood that the blue and red HV LEDs are matched with appropriate yellow and green phosphors to produce high-brightness, low-color temperature, high-efficiency high-CRI warm white LEDs, which are more suitable for the general lighting market. The HV chip is also more flexible when applied to high-power street lamps. Due to the large number of chips, the connection mode and the arrangement positions of the red and blue chips can also be diversified. The blue chip and the red chip can be divided into several groups, and then connected in series and then connected in parallel, and parallel independent power supply is implemented to facilitate adjustment to a desired color temperature.
The overall solution for high-voltage chip light distribution applications also highlights the advantages of HV chips. Zeng Lighting analyzed, "At present, some Taiwanese companies directly provide overall solutions for lighting manufacturers. The high brightness and low color temperature warm white light effect is very popular among application companies."
"As the diversification of market demand has increased, some chip companies have gradually introduced more high-voltage chips with different voltage specifications, and even introduced monochrome chips directly used for 220 volts of the mains, simplifying the design of LED lighting fixtures, bringing A new revolution."
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