Successful High

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High-power LED lighting solutions, manufacturers are currently experiencing the greatest development challenges is the design of thermal design and thermal protection, they must overcome the strong LED light on the heat sensitivity of the problem, because excessive or improper application of heat will cause the LED light source of the performance of large discount.



    Theory and practice has proven, LED and LED performance and lifetime of the PN junction temperature is closely related. When the LED chip junction temperature rise 10 , the flux will decay 1%, LED's life expectancy is reduced by 50% over current, over voltage and over temperature will significantly reduce the emission LED performance and lifetime. So in addition to good thermal design, safe and reliable thermal protection also must be considered. binks parts

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    Usually on the LED, the approximately 20% of the input power is converted to light, 80% is converted to heat. This depends on many factors, fever may be associated with the underlying irregular and phonon emission, sealing, materials and so on. The total heat generated in the LED, 90% through conduction transmission. Results for the dissipation of heat from the LED, heat conduction is the main channel, because all of convection and radiation heat transfer only about 10%.



    Clearly, LED light sources require accurate power and thermal management systems, as compared with other light sources to provide electric power to the LED is converted to heat most. Without proper thermal management, which will affect the heat output of LED life and color. Also, because LED drive is silicon devices, they will soon be invalid. This shows that have to be equipped with fail-safe backup overcurrent protection device.



    Why, then, that the success of high-power LED lighting design is inseparable from PPTC it? Many people think LED drive itself can provide over-current and thermal protection, no need to add another outside a PPTC device, as this additional cost. But this is wrong, many LED driver is very susceptible to DC voltage and polarity inaccurate. LED driver outputs will be damaged or destroyed due to short circuit. While most LED driver with built-in security features, including thermal shutdown and open and short LED detection. However, to protect the integrated circuit (IC) and other sensitive electronic components, may require additional over-current protection devices. Therefore, only PPTC (in particular, can be reset PolySwitch PPTC) is the power LED to prevent overheating damage to the most appropriate solution.



    To illustrate this problem, we first look at a typical LED driver can provide any protection. Most high-power LED constant current driver can provide a typical protection features include: thermal shutdown protection, over voltage / over-current comparator, high-current MOSFET, the current size of the adjustment, a certain level of ESD protection. However, the thermal shutdown feature is just a self-protection function, is difficult to apply to the design of LED overheat protection. The overvoltage / overcurrent protection characteristics of the need for external over-voltage protection circuit, turn power off may cause other problems. High-current MOSFET is usually short-circuit failure mode, which is potentially unsafe. LED dimming to achieve with the current regulation characteristics of LED over-temperature could cause the problem.



    PPTC protection of high-power LED, but the idea is different, it has the following four distinct advantages: 1) PPTC the typical failure mode is high impedance, so even in the fault state, LED is safe. 2) PPTC LED can directly measure the temperature, so you can close protection. 3) PPTC can be achieved over-temperature, over current and over-voltage protection function. Very easy to use, requires no external circuitry. Even in the protection of state LED can work. 4) allows designers to achieve more cost-dimming design, without worrying about security issues. Therefore, only the LED drive out with a PPTC device can achieve stronger security, meet the most stringent safety standards and achieve lower costs.

Foxconn Jumped To His Death Some Staff Consultation How Much Money Can Be Lost

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Liang Chao's falls to death so far is a mystery, his family rushed to the parents Shenzhen Care of things. Being young, he Liuzaishishang the last photo



"Ninth jump" the family is working with Foxconn negotiations, the tragedy caused in part suggesting the role of staff magnesium alloy casting

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Properly deal with the aftermath as long as we are kind of mountain people, and many details will not be further pursued.



? Foxconn ninth jump dead house attorney Liang Chao



Foxconn jumped to death so many employees, how can you not jump, I can win some compensation.



? Miss Cao said the husband with the Foxconn employees to kill herself because of family conflicts



Staff Liang Chao caught leapt to public attention once again focused his employer Foxconn. 9th and disposal matters, Foxconn has obviously skilled, the giants are building all kinds of emotional catharsis of the pipe, try to resolve the hundreds of thousands of employees of the deadly sorrow. Suggestive but even in this jump in nine brewing, as of last night, Liang Chao's family members still hope to get more compensation from the negotiations, the staff caring Foxconn already received several telephone hotline, counseling for compensation jumped to his death price. For the nine new generation of even jump reflects the problem of migrant workers, nine groups of sociologists call social concern.



Family of the deceased want compensation, "the more the better"



Liang Chao from Yuexi County, Anhui Province, and brother Liangfeng work as Foxconn; According to preliminary police investigations, the evening of May 14 nearly 11, he scratches himself with a knife jumped to his death after the quarters.



1 hours later, the uncle Liang Chao Liang Xiande receive Liangfeng phone, and the bad news Liang Chao told the parents, relatives rushed to Shenzhen, the morning of 8 people take care of things. As the grief over, Liang Chao parents did not have grain rice into a day by infusion to maintain physical, day and night, whining, 3 days, slept for only three or four hours.



6 years ago, Liangfeng technical school graduate, through labor Foxconn



services output into work, the name of this company first introduced Beam family ears. In their impression, Foxconn large, never owed wages, so a job in the home boast?? According to Liang Chao Wu Sen Yan, another uncle saying the utility of nearly 1000 meters above sea level, "as long as a little ambition, both Chuang out "?? Liang Chao is no exception, he first time last year when the entry Foxconn, took the money home to help build a house and family all thought, this is the second time to enter the profession should adapt better.



Wu Shen Yan admitted that he learned from his nephew mouth, "work is usually in addition to sleep," but his family does not care.



Last parting look casual. Mother bought a new day Mobile Excitement, head of a phone call his son "after the home and no one can beat this number," the mother said that her son was not as happy, but that is sleeping, going on night shift, then that is to make parents Later he was driven hop.



"Foxconn very good care of us, may also have experience dealing with so many times, and come have a place to live, specially arranged for the factory's carer accompanied Liang Chao's parents, there are people with special We talk about the aftermath of the incident, "about compensation, Wu Sen Yan declined to concrete progress, but acknowledged," After all, consider suicide, homicide, police said could be ruled out ... ... "



Attorney explicitly Leong told reporters, Leong want compensation, "the more the better," he evaded the question this characterization of compensation, only said, "As long as properly deal with the aftermath, we mountain people are very kind, and many details will not be pursued. "presence of family members nod.



16 evening, the park or even a husband forcing his wife jumped to discuss compensation.



Foxconn jumped to get the number of workers compensation consulting