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Although designed for general lighting applications of basic LED drive is simple, but when the phase cut dimming and power factor correction and other additional features, this design will become very complex. Without the function of power factor correction of non dimming led drivers generally includes an off-line switching power supply, with the adjusted to realize constant current output. This switch and standard off-line power supply and in the AC-DC adapter generic type is not much difference. This design can use the standard SMPS (switching power supply) circuit topology, such as Buck, boost and flyback converter.

Generally speaking, this means that the tunability will be derived from existing based on the working principle of the phase cut wall electronic dimmers, this principle was first used to the design of pure impedance incandescent lamp. Although other dimming methods, such as linear dimming with 0-10V or DALI may also meets the requirements, but they may be limited to high-end industrial class LED driver. So far, cutting tone light is quite extensive, apparently, LED lamp dimming can effectively will have a great advantage. Because the market there are many low cost of three terminal bidirectional thyristor switch dimmers on, so to ensure compatible LED driver with all categories is not realistic, especially the basic design is adopted by many dimmer, the performance is very limited. For this reason, the "Energy Star" project requires only LED drive manufacturers in a Webpage in detail which dimmers can be compatible with the product.

In the "Energy Star" specification, an additional requirement of note is the working frequency of LED must be greater than 150Hz, to eliminate the possibility of visible flicker. It means to not output current of LED power supply with any of a large number of frequency is linear frequency (50Hz or 60Hz) ripple two times.

In such as office lighting, public buildings and street lighting and other offline application, using LED lighting application more and more, and in the next few years will continue to maintain the trend. In these applications, high power LED will replace the linear or high power CFL fluorescent lamp, HID lamp and incandescent lamp. These applications require a LED drive, the typical power range is from 25W to 150W. In many cases, LED supported by the high brightness white LED array of a composition, usually adopts chip packaging forms. Used to drive the load current is usually at least 1 amp DC. Also the actual LED system AC current drive, but it is generally agreed that the DC system can provide a more ideal driving conditions for LED.

In the LED lighting equipment in need of current isolation, to prevent the risk of electric shock occurred in can reach the place, this risk may occur in most cases, unless the use of a mechanical system insulation. This is due to not need and fluorescent lighting equipment through the insulation to achieve security products, high power led module and the metal radiator. In order to achieve good thermal conductivity, need to form a barrier between the LED chip and heat sink, so that you do not need to meet the insulation requirements by adding insulating material. Therefore, the insulation is the best choice to form in the LED drive, but also shows the power converter topology technology is feasible.

Undeniable, if compared with the energy-saving lamp or fluorescent lamp of LED technology, save the energy cost is not significant. But from another point of view, if we take into account the cost of maintenance, such as artificial cost lighting lamp replacement warehouse high ceilings, busy factory hall, shopping center or inaccessible signal system generated, apparently to be much higher than the cost of energy. To ensure the normal cooling or if the junction temperature is controlled below 80 ° C, the service life of the led drivers can easily reach 100000 hours. This is the equivalent of more than 12 years of continuous work, even when it is replaced in easily accessible place, maintenance cost saving is also a dominant factor.

Life AC/DC LED driver depends mainly on the number of elements. Will soon lead to drive the weak link with less capacitor, so that the implementation of LED long life goal come true. As a company with ATE and HALT (highly accelerated life test) and the European quality control system manufacturer, RECOM in the environmental test laboratory in Austria have their own, can be in the product development process to ensure that their products meet the highest standards. For the RACD12&RACD20 series AC LED driver, RECOM not only released after calculation of MTBF (mean time between failures) value, but also provide the design service life of 70000 hours or more.

RECOM thermal management through the LED temperature regulation, when the ambient temperature rises to the limit, installed in the radiator near LED on the thermal resistance can reduce the working current, high brightness environment, the current decline slightly does not usually by human eyes perceive. Therefore, LED internal temperature keeps in the best range, which can increase the service life of the LED lamp, and without the use of oversized radiator. Assumed to work 8 hours a day, this can be achieved 25 years of working life, or at 25 ° C ambient temperature of 8 years of continuous service life. The AC converter through the lighting system UL8750 certification, and has the CE mark.

AC power converter with input voltage range for the 230VAC or 110VAC standard power supply. Usually, the ideal situation is a universal input voltage range of 90VAC to 264VAC, instead of using two different converter, even if the cost is relatively high (due to save the logistics cost). Rated power depends on the quantity you need to waterproof led power supply . For the three LED, generally use low cost 3W converter (such as micro RACD03) is enough, for lighting system more powerful with a plurality of parallel connected LED string, you need the 60W of the rated power. RECOM RACD60 is one of the smallest size 60W LED drive on the market. The product also provides open encapsulated or sealed package. The open package driver, constant current output can be set by user.

At present, there is a growing tendency for DC lighting power supply, so it is necessary to adopt DC/DC constant current buck converter in each LED device. RECOM RCD-24 series of small size, high efficiency, can provide 300mA to 1200mA adjustable output current, and can work over a wide input voltage range of 4.5V to 36V. It must be remembered that, buck converter needs to be better than the input voltage high output voltage of about 2V, so if an application can only provide the power supply voltage of 12V, then only the series three LED. If this is not enough, you must increase the supply voltage must be used, or a boost converter to generate an output voltage higher than the input voltage. This converter is still not much, but RECOM plans a significant increase in the field of products.

More than three hundred and fifty illumination producers tend to be approximated in order to mainly show LED illumination technology in 800-some booths from the Taiwan Worldwide Illumination Display this, that commences these days as well as finishes upon Scar. sixteen. Taiwan's LED heavyweights, such as Everlight Consumer electronics Company., Limited., Epistar Inc., Delta Consumer electronics Inc., Genesis Photonics Inc., Edison Opto Corp., Wellypower Optronics Corp. as well as Nanya Photonics Inc., tend to be amongst participants in the display.

Within the part time of the display, Worldwide Illumination Discussion board as well as led drivers, both these styles that are worldwide LED industry organizations started through Philips, will certainly keep yearly conferences, the very first time, within Taiwan. Co-organizers Taiwan Exterior Industry Advancement Authorities (TAITRA) as well as Taiwan Illumination Permanent fixture Foreign trade Organization additionally organise purchase seminars with regard to purchasers as well as participants in the display. Much more than the illumination reasonable, the big event is definitely an info system too. Keynote messages tend to be LED through professionals through Electrical Light as well as Element Manufacturers' Organization (ELCOMA) associated with Indian, Western Light Businesses Federation (ELC), The japanese Electrical Light Producers Organization (JELMA), Illumination Authorities Sydney (LCA), Nationwide Electric Producers Organization (NEMA) states, Osram as well as Philips. A unique discussion board is actually organized with regard to Taiwan's illumination producers and the landmass Chinese language alternatives, dealing with co-operation upon LED-lighting marketplace.

Thready Technologies is providing the synchronous buck-boost DC/DC LED car owner as well as attention control which could provide more than 100W. The four. 7V in order to 60V enter attention variety can make it ideal for programs within auto, commercial as well as new illumination. Having an flexible outcome attention through 0V in order to 60V, the actual LT3791 may be used to generate LEDs in one thread. The inner 4-switch buck-boost control works through enter trouble over, beneath or even corresponding to the outcome attention. The actual chip's style utilizes 3 manage streets in order to enter present, LED present as well as outcome attention to provide optimum overall performance as well as dependability. This utilizes 4 exterior changing mosfets as well as provides through 5W to 100W associated with constant led power supply along with efficiencies as much as 98. five per cent. LED present precision associated with +6% guarantees continuous illumination whilst & 2% outcome attention precision allows the actual convsersion app to work like a continuous attention resource. The actual LT3791 makes use of possibly film-based or even PULSE WIDTH MODULATION dimming because needed through the software.

The actual changing rate of recurrence could be designed among 200kHz as well as 700kHz or even coordinated for an exterior time clock. Additional characteristicsextra features|Extra features|Additional functions|Additional characteristics|Extra functions} consist of outcome detach, enter as well as outcome present screens, open up as well as shorted LED recognition as well as incorporated problem safety. Nan Ora Photonics is among the most tour's very first organization} using the capacity of automatic creation with regard to 7-watt LED light as well as programs to promote the item along with personal brand name. The actual connections along with Epistar, a top epitaxy machine, as well as Accuracy Si will certainly significantly increase the power for your LED effort.