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LED lamp: 6 key design issues analysis

Release time:2014-08-13 12:21:18

To design a product, must first determine the LED package structure whose; then consider how to adapt to these packages; we choose the opportunity not to be many, the optical structure is built on the package on; play us a lot of creativity is not very good.

There exists a, semiconductor lighting application problems
1, heat dissipation
2, the lack of standards, product quality
3, there is the price and quality of design problems, the final consumer choice LED lighting, lack of confidence
4, semiconductor lighting in electrical design with the traditional lighting has very big difference, traditional lamp enterprises need to experience / skills accumulation process
5, we are optimistic about the market, but there is no scale quantity
Characteristic.
1, through the adjustment of high precision constant current chip, ensure the consistency of LED brightness, chroma, provides the standard for the downstream customers in the module level, customized, reliable high-quality products;
2, the old and new lighting design manufacturers, electrical design not too complex, simply design succinct line constant voltage power supply can work the traditional outside plus, is one of the fastest and most reliable way;
3, to solve the LED lighting market technology and quality problem in large scale amount.
Two, thermal design
1, the shortest path to reduce the heat to the heat conduction resistance;
2, increase the mutual conduction area, increasing the heat to speed;
Design and calculation of the heat dissipation area of 3, reasonable;
The effect of heat capacity by 4, effective.
The output driving voltage selection:
Within 20W electric drive about 48V more appropriate;
Large power electric drive output voltage of about 36V the most appropriate;
Off-line lighting most of 12V and 24V voltage.
Characteristic.
Series parallel safety load drive voltage suitable value based on the uniform voltage decreases power supply design specifications cost;
Based on the safety regulations, product design to meet the certification requirements, the voltage peak current more than 42.4Vac or DC over 60Vdc;
Consider the technical and quality problems from solving the LED lighting market large amount of.
Three, the highest efficiency of rear drive
When the output voltage is about 48V, low dropout linear constant current device, constant current efficiency as high as 99%, the precision of constant current within ± 3%, without any peripheral device; when the output voltage is about 36V, low dropout linear constant current device, constant current efficiency as high as 98.6%, the precision of constant current within ± 3%, not subject to any peripheral device influence; even in the off-line lighting, low voltage of 12V and 24V, respectively, with an efficiency of 96% and 98%; the power efficiency is equal.
Characteristics: constant current driving structure is the most efficient; constant current to the highest accuracy, the peripheral device with minimal impact; simple, convenient and practical.
Four, the constant power flow consumption has reached to a negligible degree
In Shenzhen, CYT laboratories, we have verified to the back end of the constant current efficiency reached 99.99375%, to be completely ignored;
We used 1 years time to complete this design achievement, IC design team of 10 people and power supply manufacturers strong cooperation, will achieve the goal as soon as possible.
Five, AC-DC design
Switching power supply development today is the result of accumulated over the years, the short term AC-DC direct constant current can not break; constant voltage and constant current is the relationship between spear and shield, must be considered separately; constant current source load adjustment rate is 1% (mA) /V, are not up to the constant current effect; the more ideas into higher costs, proportional and risk.
Characteristic.
To switch power supply existing resources reasonable use, is the most economic;
Constant voltage and constant current technology is the combination of the inevitable;
In the stability of the products and technology creativity is effective.
With the constant current switching mode
Six, LED encapsulation is the future development trend
Combination design module can effectively reduce the cost of disposable packaging; packaging dispersed to reduce heat dissipation design cost; choice of aluminum based PCB plate for domestic; optical design; simplify the design of power supply; package diversity; favorable to enhance domestic competitiveness of LED. !