Works AC LED light source in Figure 3, the pile of tiny grains using LED matrix are arranged in a s

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LED light source as a green, energy saving, energy saving, best washing machine 2012 long life of the fourth generation of lighting and the sudden emergence of broad interest, the rapid development in full swing. The current LED light source is a low voltage (VF = 2 3.6V), the semiconductor device large current (IF = 200 1500mA) work, must flow in order to provide the appropriate DC normal light. Direct current (DC) to drive the LED light source best washing machine 2012 technology has become increasingly sophisticated, because the power of our daily lighting using high voltage AC (AC 100 ~ 220V), so you must use technology to get down lower voltage, commonly used is step-down transformer or switching power supply, then the alternating (AC) is converted into direct current (DC), then converted into a DC current source, in order to promote the LED light source. Thus DC drive LED light source system applications must be: + rectifier transformer (or switching power supply) + constant current best washing machine 2012 source (FIG. 1). LED light fixture is bound to have some space to accommodate this module, but for E27 standard screw fixture for space is very limited, it is difficult placement. Whether there is a certain amount of loss through the transformer + rectifier or step-down switching power supply, the system will, DC LED from about 15% to 30% of the electric power between the AC and DC switching is loss, system efficiency is difficult to achieve more than 90% . If you can use the AC (AC) direct drive LED light source, the system best washing machine 2012 will greatly simplify the application program, the system efficiency will easily reach 90%.
Seoul Semiconductor Seoul Semiconductor today that early in 2005 has been the invention can be used to communicate directly best washing machine 2012 driven to emit light of AC LED, followed by the United best washing machine 2012 States III-N Technology, 3N technology development MOCVD growth of GaN substrate technology on the basis of Applications best washing machine 2012 can improve lighting and sensors, and reduce costs and increase productivity. Large and small, light-emitting diodes on silicon production technology to provide six inches. Single-chip AC-emitting diode (AC LED) 3N invention, the establishment of a comprehensive patent portfolio to protect and improve the technology, firmly establish its proprietary position, is the premier exchange of large-scale commercial production of light-emitting diode products. China's Taiwan Province, "Industrial best washing machine 2012 Technology Research Institute" in 2008 and also completed to industrial production and practical applications of AC LED product solutions, can be directly plugged in 60Hz AC 110V AC voltage or higher frequency so that the exchange of light, applies lights, neon, low-wattage lighting, can effectively solve the existing LED can not be used directly in the AC source, resulting in higher cost of product applications shortcomings. Taiwan's ITRI's On Chip AC LED (on-chip AC LED) thus obtained is known as the American industrial innovation known as the annual Oscars best washing machine 2012 2008 R & D 100 Award Award. Now the whole world only the United States, South Korea and China Taiwan have this technology, the development of Taiwan's best washing machine 2012 ITRI white, blue and green AC LED manufacturing process technology, not only with international standards, but also one of the world leaders.
Major technological breakthrough AC LED light source is LED ultra-fine grain when the package best washing machine 2012 special permutations technology, while taking advantage of the characteristics LED PN junction diode rectifier doubles, in which the semiconductor manufacturing best washing machine 2012 process plays a very important role. AC LED by semiconductor process integration into a pile of tiny grains arranged in a matrix-style best washing machine 2012 staggered process and added to the bridge circuit chip design, the AC current can double conduction achieve light. ? Arrangement of grains shown in Figure 2, the left is using AC LED matrix grains arranged in staggered schematic, right inset is the actual AC LED grain alignment photo, AC LED die after connecting an AC Quintana light, therefore only need two AC sources that can lead to import luminous work.
Works AC LED light source in Figure 3, the pile of tiny grains using LED matrix are arranged in a staggered process is divided into five series, AC LED string consisting of grains are coupled AC source is similar to a bridge rectifier, rectifier bridge at both ends , the other ends of the flow along the blue path joins a string of LED die, the positive half cycle of the AC, 3 series LED die light, the negative half-cycle flow along the green path, there are three strings of LED light-emitting grains, four bridge arm LED die turns light, LED die relatively bridge arm while light, LED die because of a bunch of middle and has been shared in light. AC at 60Hz to 60 times per second will be the frequency of rotation lights. DC rectifier bridge is made of pulsating DC, LED luminescence is flashing, LED continuous light with power afterglow characteristics, persistence to keep tens of microseconds, due to the human eye to spot the flow memory is inert, the results were Eye on the LED light source emitting + afterglow mode interpretation is continuous in light. LED work half the time, half the time at rest, and thus heat can be reduced by 40% to 20%. So AC LED's life than DC LED long.
AC LED on the power of the convenience of home, do not like the same DC LED lamps installed in addition have to help an AC to DC converter, not only saves the cost of Fengyun converter, but also to avoid LED light source itself not bad, but converter was first broken dilemma. AC-DC converter can be said to be a time with aging, broken electronic components, their life expectancy is shorter than the LED light source itself, it is now a lot of broken LED lamps, LED light source life is not done, but the LED AC-DC converter is used to broken best washing machine 2012 lamps. AC LED as well as a feature, because its process, staggered matrix arrangement, is lit in turn, will be at 60Hz ac frequency to 60 times per second best washing machine 2012 rotation is lit, let AC LED's best washing machine 2012 life than DC LED long.
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