[Source: "High-tech LED-technology and application" August issue Yang Zhenyi]
I. Introduction
As the country advocates the environmental protection concept of “promoting energy conservation and emission reduction and ecological environmental protection†and the “12th Five-Year Development Plan for Integrated Circuit Industry†and other specific measures to stimulate LED domestic demand, China’s LED industry will inevitably enter the industry. A new phase of transformation and competition mode, in which LED lighting has become the driving force behind traditional lamps with its energy-saving advantages. Compared with traditional luminaire light sources, LED lighting has the advantages of low operating voltage, high efficiency and directional light. In general, the LED itself has a lifetime of more than 50,000 hours (the incandescent lamp life is only 1,000 hours), and the design of its power module is related to the conversion efficiency and service life of the overall lighting device.
LED lighting equipment is a comprehensive solution for integrating power conversion, electronic control devices, optical components and thermal management. The overall power modules are all made up of solid-state components. The key components are -- filter capacitors. At present, most manufacturers still use liquid electrolytic capacitors due to key technical problems, but the thermal stability of electrolytic capacitors causes potential LED lamp life problems. According to statistics, the cause of LED street lamp failure is mainly due to: LED lamp chip quality problem (about 10%), chip process is not mature (early common), LED chip thermal design is improper (light output drops to initial value 70%), line and structure problems (about 20%), driving power quality problems and other five sources, of which 70% of the failure rate of the drive power supply and the output of the filter capacitor as the main short board original.
Most industrial and commercial power supplies operate at 50%-80% pulsed load, while LED drive power supplies operate at 100% constant load for a long time. The traditional power supply working environment temperature is generally 25-35 °C, and the ambient temperature of LED driving power supply is as high as 50-60 ° C, electrolytic capacitor operating temperature difference is 45-55 ° C, LED lighting using electrolytic capacitors will lead to a shortened power supply life dozens of times!
Second, the solution to the problem of LED lighting heat dissipation
Those who have experienced the storm of computer motherboards in the Internet cafe industry a few years ago may still have a lot of trouble. Later, with the function of the central processing unit (CPU), the increase of the operating frequency and the increasing number of transistors, in order to stabilize the system, Intel proposed a conductive polymer aluminum solid capacitor for the 775PinCPU launched in 2005. Hereinafter, the solid capacitor is replaced by a conventional liquid electrolytic capacitor (hereinafter referred to as an electrolytic capacitor), so that the solid capacitor is red-hot overnight.
Figure 1 is taken from "Bubble". Figure 2 is taken from "Bubble"
Internet cafe industry computer motherboard explosion, mainly because the motherboard works in a long-term closed environment (similar to the LED power module working environment), resulting in electrolytic capacitor filtering and voltage reduction function, capacitor temperature rises to the electrolyte inside the capacitor The internal pressure rises due to heat, and the electrolyte is depressurized along the explosion-proof hole of the capacitor, causing the capacitor to fail. In the case of heavy, the use of fake solid capacitors, because there is no explosion-proof hole design, in the case of high temperatures, the electrolytic capacitor will explode! Imagine an LED street lamp in Beijing and other places in China. When the temperature of summer is about 40 °C, the electrolytic capacitor is in a closed environment. When the temperature rises, the temperature of the lamp rises, and the temperature rises, the internal temperature of the LED lamp rises continuously, which will cause the capacitor to explode. Pulp (see Figure 3). In addition, in a harsh environment, such as the environment of 30-40 ° C in Heilongjiang winter, can it still work normally?
(unfinished)
For more information, please refer to "High-tech LED - Technology and Applications" August issue]
I. Introduction
As the country advocates the environmental protection concept of “promoting energy conservation and emission reduction and ecological environmental protection†and the “12th Five-Year Development Plan for Integrated Circuit Industry†and other specific measures to stimulate LED domestic demand, China’s LED industry will inevitably enter the industry. A new phase of transformation and competition mode, in which LED lighting has become the driving force behind traditional lamps with its energy-saving advantages. Compared with traditional luminaire light sources, LED lighting has the advantages of low operating voltage, high efficiency and directional light. In general, the LED itself has a lifetime of more than 50,000 hours (the incandescent lamp life is only 1,000 hours), and the design of its power module is related to the conversion efficiency and service life of the overall lighting device.
LED lighting equipment is a comprehensive solution for integrating power conversion, electronic control devices, optical components and thermal management. The overall power modules are all made up of solid-state components. The key components are -- filter capacitors. At present, most manufacturers still use liquid electrolytic capacitors due to key technical problems, but the thermal stability of electrolytic capacitors causes potential LED lamp life problems. According to statistics, the cause of LED street lamp failure is mainly due to: LED lamp chip quality problem (about 10%), chip process is not mature (early common), LED chip thermal design is improper (light output drops to initial value 70%), line and structure problems (about 20%), driving power quality problems and other five sources, of which 70% of the failure rate of the drive power supply and the output of the filter capacitor as the main short board original.
Most industrial and commercial power supplies operate at 50%-80% pulsed load, while LED drive power supplies operate at 100% constant load for a long time. The traditional power supply working environment temperature is generally 25-35 °C, and the ambient temperature of LED driving power supply is as high as 50-60 ° C, electrolytic capacitor operating temperature difference is 45-55 ° C, LED lighting using electrolytic capacitors will lead to a shortened power supply life dozens of times!
Second, the solution to the problem of LED lighting heat dissipation
Those who have experienced the storm of computer motherboards in the Internet cafe industry a few years ago may still have a lot of trouble. Later, with the function of the central processing unit (CPU), the increase of the operating frequency and the increasing number of transistors, in order to stabilize the system, Intel proposed a conductive polymer aluminum solid capacitor for the 775PinCPU launched in 2005. Hereinafter, the solid capacitor is replaced by a conventional liquid electrolytic capacitor (hereinafter referred to as an electrolytic capacitor), so that the solid capacitor is red-hot overnight.
Figure 1 is taken from "Bubble". Figure 2 is taken from "Bubble"
Internet cafe industry computer motherboard explosion, mainly because the motherboard works in a long-term closed environment (similar to the LED power module working environment), resulting in electrolytic capacitor filtering and voltage reduction function, capacitor temperature rises to the electrolyte inside the capacitor The internal pressure rises due to heat, and the electrolyte is depressurized along the explosion-proof hole of the capacitor, causing the capacitor to fail. In the case of heavy, the use of fake solid capacitors, because there is no explosion-proof hole design, in the case of high temperatures, the electrolytic capacitor will explode! Imagine an LED street lamp in Beijing and other places in China. When the temperature of summer is about 40 °C, the electrolytic capacitor is in a closed environment. When the temperature rises, the temperature of the lamp rises, and the temperature rises, the internal temperature of the LED lamp rises continuously, which will cause the capacitor to explode. Pulp (see Figure 3). In addition, in a harsh environment, such as the environment of 30-40 ° C in Heilongjiang winter, can it still work normally?
(unfinished)
For more information, please refer to "High-tech LED - Technology and Applications" August issue]
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