Top Ten Key Designs of LED Lighting

　　To design a product, we must first determine which LED package structure to use; then consider how to adapt to these packages; we have few options, and the optical structure is built on these packages; many of our creative ideas cannot be fully utilized. The following introduces the key issues and analysis in the LED lighting design process.

　　1. Problems in semiconductor lighting applications

　　1. Heat dissipation

　　2. Lack of standards, uneven product quality

　　3. There are price and design quality issues, and consumers ultimately lack confidence in choosing LED lighting

　　4. Semiconductor lighting is very different from traditional lighting in terms of electrical design. Traditional lighting companies need to accumulate experience/skills.

　　5. Everyone is optimistic about this market, but it has not yet reached a large scale

　　Features:

　　1. By adjusting the high-precision constant current chip, the consistency of LED brightness and color is ensured, and standard, customized, reliable and high-quality products are provided to downstream customers at the module level;

　　2. For new and old lamp design manufacturers, do not overly complicate the electrical design. A simple circuit design that only requires a traditional constant voltage power supply is the fastest and most reliable way.

　　3. Solve the technical and quality issues of large-scale LED lighting market.

　　2. Heat dissipation design

　　1. The shortest heat transfer path to reduce heat conduction resistance;

　　2. Increase the mutual conduction area and increase the heat transfer speed;

　　3. Reasonably calculate and design the heat dissipation area;

　　4. Effectively utilize the heat capacity effect.

　　Output drive voltage selection:

　　1. When the AC power is less than 20W, 48V is more suitable;

　　2. The most suitable output voltage for a larger power AC drive is about 36V;

　　3. Most of the offline lighting is 12V and 24V voltage.

　　Features:

　　1. Consider the appropriate driving voltage value for the load based on series and parallel safety, and try to unify the voltage value to reduce the power supply design specification cost;

　　2. Based on safety regulations, product design must meet certification requirements, with peak current exceeding 42.4Vac or DC voltage exceeding 60Vdc;

　　3. Consider the technical and quality issues in solving the large-scale expansion of the LED lighting market.

　　3. Highest Efficiency Back-end Drive Mode

　　When the output voltage is around 48V, the constant current efficiency of the low-voltage difference linear constant current device is as high as 99%, the constant current accuracy is within ±3%, and it is not affected by any peripheral devices; when the output voltage is around 36V, the constant current efficiency of the low-voltage difference linear constant current device is as high as 98.6%, the constant current accuracy is within ±3%, and it is not affected by any peripheral devices; even in the offline lighting part, the lower voltages of 12V and 24V have efficiencies of 96% and 98% respectively; the power size and efficiency are equal.

　　Features: The most efficient driving constant current architecture; the highest precision constant current method, least affected by peripheral devices; simple, convenient and practical.

　　4. The power consumption of constant current has reached a negligible level

　　In the Shenzhen CYT laboratory, we have verified that the back-end constant current efficiency has reached 99.99375%, to the point where it can be completely ignored;

　　In the future, we will complete this design achievement in one year. With the cooperation of an IC design team of more than ten people and a strong power supply manufacturer, we will achieve this goal as soon as possible.

　　5. AC-DC Design

　　The development of switching power supplies is the result of many years of accumulation. In the short term, direct AC-DC constant current cannot be broken through; constant voltage and constant current are like a spear and a shield, and must be considered separately; the load adjustment rate of the constant current source is 1% (mA) / V, which cannot achieve the constant current effect; the more ideas you have, the higher the cost, which is proportional to the risk.

　　Features:

　　1. It is most economical to make rational use of existing switching power supply resources;

　　2. The combination of constant voltage and constant current technology is inevitable;

　　3. Creativity is only effective when based on stable product technology.

　　6. LED combined packaging is the future development trend

　　The combined design of the modules can effectively reduce the one-time packaging cost; the dispersed packaging form is conducive to reducing the cost of heat dissipation design; the selection of domestic aluminum-based PCB panels is convenient for optical design; the power supply design is simplified; the packaging form is diverse; it is conducive to enhancing the competitiveness of domestic LEDs. !

　　7. The packaging structure 'kidnaps' our optical effect design

　　These are representative packages from CREE , Nichia, Lumileds , and OSRAM  . To design a product, we must first determine whose LED package structure to use; then consider how to adapt to these packages; we have few options, and the optical structure is built on these packages; many of our creative ideas cannot be fully utilized.

　　The design of lamps is ever-changing. How can we get rid of this situation?

　　8. Combination of modular packaging and constant current technology

　　Designing LED packages at the PCB level is easy and low-cost. By brainstorming, everyone can develop different types of packages. Products can be designed based on power LEDs that integrate constant current technology and light distribution parameters. This can effectively meet the ever-changing needs of LED lamps . For the power supply part, only the existing traditional switching constant voltage power supply is used. This can increase the speed of product launch, make the lamp design simple and practical, and significantly reduce costs. It can also avoid the blockade of cutting-edge LED package patents.

　　9. Packaging according to voltage nominal value

　　LED constant current drive innovation technology was born in Shenzhen CYT. I named it "Power LED Constant Current Integrated Packaging" technology, referred to as "Module Packaging"; this technology is based on LED packaging technology and directly integrates low voltage difference linear high-precision constant current technology; in the future, LEDs can directly appear in nominal voltage value specifications, such as: 12V/1W, 24V/1W, 36V/1W, 48V/1W, 12V/3W, 24V/2W...36V/10W, etc. In the future, customers who use CYT technology in product design no longer need to consider any LED constant current issues, and can use the existing standard constant voltage power supply. This technology will declare the end of the "LED constant current power supply"!

　　10. Design the light source according to the product

Break the original design of products according to light sources, and customize the LED light source packaging form 　　according to the product ; maximize the creative display of the product; design the optical packaging structure for the product; low cost; design the heat dissipation structure in combination with the product, reduce the thermal resistance; high constant current accuracy; integrated protection function. Shenzhen CYT company LED laboratory can quickly help you complete product design.

　　Advantages of modular light sources ①Effectively reduce costs

　　1. Reduce the number of packaging times and save packaging costs;

　　2. Improve consistency and yield rate by producing under the same environment and conditions;

　　3. Reduce optical design costs;

　　4. Reduce the cost of heat dissipation design;

　　5. Batch mixed packaging to reduce grading costs;

　　6. Simplify product design and reduce overall costs;

　　7. Low-cost packaging architecture. This technology will guide the LED lighting industry to develop in a healthy direction.

　　Advantages of modular light sources ②Reduced thermal resistance

　　1. The light source is directly combined with the shell radiator;

　　2. Avoid using PCB as a heat medium;

　　3. Reduce the heat dissipation path from chip to housing;

　　4. Use the latest heat transfer technology to most effectively reduce the heat dissipation thermal resistance and solve the heat dissipation design problem.

　　Advantages of modular light source ③High constant current accuracy

　　1. Consider Vf value uniformly within the module;

　　2. The constant current source is less affected by the outside world;

　　3. The linear technology is mature and there are no peripheral devices affecting the accuracy;

　　4. No EMI interference problem affecting accuracy;

　　5. Multiple parallel connections are not independent of each other, which affects the accuracy;

　　6. The load constant current accuracy is not affected by power supply fluctuations. The highest constant current accuracy architecture, the most optimized design architecture for LED brightness consistency and life.

　　Advantages of modular light source ④ Protection integrated design

　　1. Built-in temperature protection;

　　2. Internal power supply and protection technology;

　　3. Built-in high grayscale interface;

　　4. Short circuit and open circuit protection;

　　5. Linkage protection function can be set;

　　6.ESD protection.

　　Any other built-in functions and protection requirements can be discussed.

　　Advantages of modular light sources ⑤ Take the traditional power supply path

　　This is the first step of stability; strong selectivity; the most favorable cost; indicators that switching power supplies cannot achieve, LED power supplies are also difficult to achieve, and there are no detours; even if a powerful company designs, the LED part also needs time to verify; there is no electromagnetic compatibility problem at all. It takes time for the power supply to mature. Do you believe some of the propaganda about LED power supplies? Constant voltage first, then linear constant current, must be the future market mainstream of LED lighting drive mode!