21/05/2014
Adjust the thermal management of the LED driver for using temperature
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.
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