LEDinside recently invited Jiang Kunyuan, general manager of liquid-light solid-state lighting, to make an industry interview. The company won the gold medal in the 11th Moscow Invention Exhibition in 2008 with the "Liquid Immersion Thermal Management Solution High-Power LED Packaging Technology". There are special technologies in LED lamps, which greatly improve the heat dissipation, light type and cost of LED bulbs. Jiang Kunyuan, general manager of liquid-light solid-state lighting, is the patent inventor of our commonly used warm packs. He has expertise in heat-dissipation-related technology and has designed a novel LED heat-dissipation method based on special liquids and metal heat-dissipating sheets. Mastered key technologies and multiple patents. The following is the compilation of LEDinside's important interviews and sharing with everyone who cares about the development of the global LED industry.
Technology is in place early, waiting for the AC LED that is best suited for indoor lighting
Jiang Kunyuan said that at the beginning of liquid-state solid-state lighting, many methods have been tried to create a heat-dissipating technology suitable for lamps, and many experiences have been gained. Mr. Jiang first came into contact with high-power LEDs in 2002. At the beginning, he obtained the LUXEON LED products successfully developed by Lumileds in the United States through thermoelectric separation and packaging. At that time, the heat dissipation concept of this product was to use a high thermal conductivity insulating carrier. And with optical lens, reflector lamp cup, transparent plastic and other institutions. Later, different high-power LEDs were used and tried to find good heat-dissipating materials.
Mr. Jiang tried almost 1,000 kinds of materials and completed the method of dissipating heat by using liquid heat dissipation in LED lamps, and achieved good results of light-emitting efficiency, waiting for AC LEDs suitable for LED lighting. Not long after the industry published a viable paper on AC LED, Seoul Semiconductor of South Korea released the world's first AC LED product at the end of 2006. Initially, it was sponsored by Seoul Semiconductor to create an AC LED with the company's special package heat dissipation structure. A novel LED luminaire. The LED lamps we watched on that day were 2 watts and 4 watts. The light type and efficiency were not bad. The temperature difference between the lamps and the room temperature was also more than 20 degrees.
Advantages and disadvantages of AC LED
The reason why the non-LED industry mainstream AC LED is used, Jiang always dispels doubts for us. The most important thing is to consider the convenience of using it in household electricity. It does not need to install an AC to DC converter like DC LED. (AC to DV Converter) not only saves the cost of this converter, but also avoids the dilemma that the LED component itself is not broken, but the converter is broken first. The AC/DC converter can be said to be a passive electronic component that will age and break down over time. Its life span is shorter than that of the LED component itself. Therefore, many LED lamps are broken now, not the LED life is exhausted, but the LED lamp The AC-DC converter used was broken first. Another feature of AC LEDs is that their processes are arranged in a staggered matrix, which is lit up in turn. In 60 Hz AC, it will be lit at 60 times per second, which also makes the life of AC LEDs longer. The DC LED is long.
The most common example of a DC LED is a flashlight, which is a battery-powered device, so it is well suited for DC LED characteristics and does not require an additional power conversion device.
However, AC LED has two shortcomings at this stage. One is that the luminous efficiency is not as high as the DC LED, but this is because the development of DC LED is currently the mainstream, and the luminous efficiency of AC LED can catch up with or even exceed DC LED. The second is that AC LEDs are at risk of electric shock. Therefore, if the AC LED is to be applied to LED lighting fixtures, the bareness of the metal sheet should be avoided, but the indirect tropical walking, that is, the core concept of the liquid-light solid-state lighting company.
Jiang always mentioned that when he first contacted Seoul Semiconductor in South Korea, the other party had not noticed the impact of this solution on AC LED lamps. After the actual proofing test, he saw the "liquid immersion heat management solution" as a direct AC power supply. Advantages of AC LED bulbs, AC LED street lights, etc.
Please take a look at the next article: New AC LED lighting that will be used for heat dissipation, light type, etc.: LEDinside interview with liquid-solid solid-state lighting (2) (with our short film for the liquid lighting AC LED product)
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