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LED lighting design full analysis

LED lighting design full analysis

To design a product, first determine which LED encapsulation structure; then consider how to adapt to these packages;

First, the semiconductor lighting applications in the existing problems

1, heat dissipation 

2, the lack of standards, products mixed 

3, there is price and design quality problems, the final consumer choice LED lighting pcb manufacturing, lack of confidence 

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

5, we are optimistic about the market, but there is no scale on the amount 

Features: 

1, by adjusting the high-precision constant current chip to ensure that the LED brightness, color consistency, at the module level for downstream customers with standard, customized, reliable high-quality products; 

2, new and old lighting design manufacturers, not too complicated electrical design, just outside the traditional constant voltage power supply can work with the simple line design, is the fastest and most reliable way; 

3, to solve the large-scale LED lighting pcb market on the amount of technical and quality issues. 

Second, the thermal design 

1, the shortest heat transfer to the path, reducing the heat conduction resistance; 

2, increase the mutual conduction area, increase the heat transfer to speed; 

3, a reasonable calculation of design cooling area; 

4, the effective use of heat capacity effect. 

Output drive voltage selection: 

20W within the city when driving about 48V more appropriate; 

The greater the power of the mains drive output voltage of about 36V most appropriate; 

Off-line lighting is mostly 12V and 24V voltage. 

Features: 

Based on the serial and parallel safety considerations to load the appropriate drive voltage, as far as possible uniform voltage to reduce the power supply design specifications cost; 

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

From the LED lighting market to solve the large-scale technical and quality issues to consider. 

Third, the most efficient way back-end drive 

When the output voltage is about 48V, the low-dropout linear constant current device constant current efficiency up to 99%, constant current accuracy within ± 3%, without any external device; when the output voltage is about 36V, low dropout linear constant current device Constant current efficiency of up to 98.6%, constant current accuracy of ± 3% or less, without any external device effects; even in the off-line lighting part, the lower voltage 12V and 24V, respectively, 96% and 98% efficiency; Efficiency is equal. 

Features: the most efficient drive constant current architecture; the highest precision constant current mode, by the peripheral device the smallest; simple, convenient and practical. 

Fourth, the constant current consumption of power consumption has reached a negligible level 

V. AC-DC design 

Switching power supply to the development of today is the result of years of accumulation, short-term AC-DC direct constant current can not break; constant pressure and constant current is the relationship between spear and shield, must be considered separately; constant current source load regulation is 1% ) / V, not up to constant current effect; the more the idea the higher the cost, and risk is proportional to. 

Features: 

To rational use of existing switching power supply resources, is the most economical; 

Constant pressure and constant current technology is inevitable; 

In the stability of the product technology is effective. 

Compared with the switch constant current mode 

Six, LED combination of packaging is the future development trend 

Module design can effectively reduce the cost of one-time packaging; decentralized package is conducive to reducing the cost of cooling design; choose domestic aluminum-based PCB plate; easy to optical design; power supply design simplicity; package in various forms; favorable to enhance domestic LED competition force.

Seven, the packaging structure 'kidnapped' our optical effect design

To design a product, first determine which LED encapsulation structure; then consider how to adapt to these packages;

Lighting design is ever-changing, how can we get rid of this situation? 

8, modular packaging and constant current technology 

In the PCB board design LED package, easy to achieve low cost; we brainstorming, can develop different types of packaging; integrated constant current technology and light distribution parameters after the power LED pcb design products; effective response ever-changing, ever-changing LED lighting needs; power part, only the use of existing traditional switch constant voltage power supply; improve product delivery speed, lighting design simple and practical, cost significantly reduced; also can avoid the front LED packaging patent containment. 

Nine, according to the voltage nominal package 

LED constant current drive innovation technology was born in Shenzhen, it is named "power LED constant current integrated package" technology, referred to as "module package"; this technology is based on LED packaging technology directly integrated low-dropout linear high-precision constant current technology ; After the LED can be directly nominal voltage specifications appear, such as: 12V / 1W, 24V / 1W, 36V / 1W, 48V / 1W, 12V / 3W, 24V / 2W ... 36V / 10W and so on. Later, customers use this technology product design, no longer need to consider any problems on the LED constant current, the use of existing standard constant voltage power supply can be. This technology will be declared "LED constant current power" one that end! 

10, according to product design light source 

Breaking the original design by the light source of the product, in turn, according to the product custom LED light source package; the maximum with the product creative show; because the product design optical packaging structure; low cost; combined with the product design thermal structure, thermal resistance; constant current accuracy; Protection function is integrated. Rayming LED PCB can help you complete your product design quickly.

11, modular light source advantages ① effective cost reduction 

Reduce the number of packages, saving packaging costs;

With the environment, conditions of production to improve consistency, improve the yield; 

Reduce the cost of optical design; 

Reduce the cost of cooling design; 

Batch mixing package, reduce the cost of sub - file;

Product design simplifies, reduces overall cost; 

Low-cost package architecture. This technology will guide the LED lighting industry in the direction of healthy development. 

12, modular light source advantages ② lower thermal resistance 

Light source and the shell radiator directly;

Avoid PCB as a heat medium; 

Reduce the chip to the shell cooling path; 

Using the new heat to the technology; the most effective to reduce the thermal resistance, to solve the thermal design problems. 

13, the advantages of modular light source ③ high precision constant current 

The Vf value is considered uniformly within the module. 

Constant current source affected by the outside world; 

Linear technology mature high, no peripheral device impact accuracy; 

No EMI interference problem affects accuracy; 

Multi - parallel parallel to each other does not affect the accuracy; 

The load constant current accuracy is not affected by the power supply fluctuation. The highest constant current accuracy architecture, the LED brightness consistency and life optimization of the design architecture. 

14, modular light source advantages ④ protection of integrated design 

Built-in temperature protection; 

Internal power and protection technology; 

Built-in high gray interface; 

Short circuit and open circuit protection; 

Can be set linkage protection function; 

ESD protection. 

Any other built-in features, protection requirements can be discussed. 

15, modular light source advantages ⑤ take the traditional power road 

This is a robust first step; optional strong; cost is the most favorable; switching power supply can not achieve the indicators, LED power supply is also difficult to achieve, less detours; even if the strength of the company design, LED part also takes time Verify that there is no electromagnetic compatibility problem at all. The power of the mature takes time, some of the publicity on the LED power you believe it? First constant pressure, and then linear constant current, must be LED lighting drive the future market mainstream!

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