LED lighting key design issues is a comprehensive analysis of

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A semiconductor lighting applications


1, heat


2, the lack of standards, mixed products


3, the price and design quality, and ultimately consumers select the downlight led lighting, lack of confidence


4, semiconductor lighting and traditional lighting in electrical design are very different, the traditional lighting companies need experience / skill accumulation process


5, we are bullish on the market, but also the scale


Features:


1, by adjusting the precision constant current chip, ensuring consistent LED brightness, chroma, and a module for downstream customers provides a standard, customized, reliable, high-quality products;


Old and new lighting design manufacturers, not to be too complex electrical design, just in the external simple circuit design coupled with traditional constant voltage power supply to work, is the fastest and most reliable way;


(3) to solve large-scale LED lighting market on the amount of technology and quality.


Second, the thermal design
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1, the shortest thermal spread path, reduce the heat conduction resistance;


2, increasing the mutual conduction area, increase the speed of thermal spread;


3, a reasonable calculation of the design of cooling area;


And effective use of the heat capacity effect.


The output drive voltage selector:


20W less than the electric drive 48V or so more appropriate;


Large power mains-driven output voltage of about 36V is the most appropriate;


Most of the off-line lighting is 12V and 24V.


Features:


Load the appropriate drive voltage value based on the series and parallel security considerations, and try to unify the voltage to reduce the cost of power supply design specifications;


Based on safety regulations, product design to meet the certification requirements, flow peak exceed 42.4Vac of or DC more than 60 Vdc voltage;


From the technical and quality problems to solve large-scale on the amount of the LED lighting market to consider.


Third, most efficient back-end driver


When the output voltage of about 48V, low dropout linear constant current devices constant current efficiency up to 99%, the current precision is within ± 3%, without any peripheral devices impact; when the output voltage of about 36V, Low Dropout Linear Constant flow device constant current efficiency up to 98.6%, less than the current precision ± 3%, without any peripheral devices impact; even in the off-line lighting part, the lower voltage of 12V and 24V respectively 96% and 98% efficiency; the efficiency of the power level is equal.


Features: the most efficient drive constant current structure; on the most high-precision constant current, the impact of peripheral devices smallest; simple, convenient and practical.

< br />Constant current power consumption has reached a led lighting fixture level


In the Shenzhen CYT company laboratory, we have verified to the back-end constant current efficiency of 99.99375%, to the point of completely ignored;


The next one year to complete this design achievement, the IC design team of more than 10 people and a strong co-operation of the power supply manufacturers, this goal will be completed as soon as possible.