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“The LED power supply improvement solution needs to break the train of thought and improve and innovate through new ways.†He Zhenguang, chief engineer of Shenzhen Wonengda Technology Co., Ltd. (hereinafter referred to as 'Wonengda') introduced.
It is understood that 70% of the LED product failure rate applied to the lighting field appears on the power supply. Many solutions based on traditional ideas have not fundamentally solved the problem of LED power supply stability. Why not seek solutions from new ideas? Wonengda proposes a secondary post-constant current IC with a pre-stage PFC+ post-stage secondary constant current drive scheme, which can be used to develop ICs and drive powers that can be upgraded or lowered (input voltage can be higher or lower than LED operating voltage). A strong new circuit topology, trying to solve many technical problems of power supply through a new solution.
Alternative LED driver solutions
Wonengda is one of the few companies to enter the research and application of LED constant current source drive. It is very familiar with how to make LED drive power because it has been engaged in thyristor dimming power supply solution and adaptable power supply development. Better compatible with current application environment products.
It is understood that the current LED lighting market is mainly concentrated in two, one for the replacement market, simply to replace the original incandescent or halogen lamps with LED lamps; the other is a new installation, these markets can follow the LED The characteristics create new models, currently focused on new architectural lighting or large-scale renovation projects of government agencies.
As a cheap and large-scale 12V power supply for lighting quartz lamps, electronic transformers are still running around 2 billion. Since the output characteristics of the electronic transformer do not match the low-power LED lamps, problems such as no light, flicker, and insufficient output may occur. If the quartz lamp is completely replaced by an LED lamp, it will achieve good energy-saving effect, but in the process of replacement, if the electronic transformer is to be replaced, the cost is quite expensive, especially in Europe and America, the labor cost is almost the transformer. 10 times.
"We have combined multiple technologies and applied new circuit topologies and ASICs to solve this problem." He said that the power supply has been tested to be compatible with more than 95% of electronic transformers. The electronic transformer has a driving energy of not less than 20W, which is suitable for the high-power lamp driving of the AR111 type.
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For more details, please refer to the August issue of "High-tech LED-Technology and Applications" 
[Source: "High-tech LED - Technology and Applications" August issue Long Zonghui]