Analysis of 15 key design problems of lighting fixtures

Introduction: to design products, we must first determine the LED package structure whose next; consider how to adapt to these packages; we choose the opportunity not to be many, the optical structure is built on these packages above; we play a lot of creativity is not very good.

Problems in the application of semiconductor lighting

1, heat dissipation

2, lack of standards, product mix

3, the existence of price and design quality issues, the ultimate consumer choice LED lighting, lack of confidence

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

5, we are optimistic about the market, but not on the scale

Characteristic

1, through the adjustment of high precision constant current chip, to ensure the consistency of LED brightness, chroma, at the level of the module for the downstream customers to provide standard, customized, reliable high-quality products;

2, the old and new lighting design manufacturers, not too complex electrical design, simply add the traditional constant voltage power supply can work in the design of the line is the fastest and most reliable way;

3, to solve the LED lighting market a large amount of technical and quality issues.

Two, heat dissipation design

1, the shortest heat transfer path, reduce heat conduction resistance;

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

3, a reasonable calculation of the design area;

4, the effective use of heat capacity effect.

Output drive voltage selection:

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

Larger power output voltage of 36V is the most suitable;

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

Characteristic

Based on the series parallel connection, the load voltage is considered, and the power supply voltage is reduced as much as possible;

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

From the LED lighting market to solve a large number of technical and quality issues.

Three, the highest efficiency rear drive

When the output voltage is about 48V, low dropout linear constant current device, constant current efficiency up to 99%, the precision of constant current is less than 3%, without any peripheral devices; when the output voltage is about 36V, low dropout linear constant current device, constant current efficiency up to 98.6%, the precision of constant current is not less than 3%. Any peripheral devices; even in off-line lighting, low voltage 12V and 24V, respectively, efficiency of 96% and 98%; the size of the power efficiency is equal.

Features: the most efficient drive constant current architecture; the highest accuracy of the constant current mode, the smallest impact by the peripheral devices; simple, convenient and practical.

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

In the Shenzhen laboratory, we have validated the back-to-back constant current efficiency reached 99.99375%, to be completely ignored; we use 1 years to complete this design achievement, the IC design team of more than and 10 people and 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 years of accumulation, the short term can not be directly AC-DC constant current constant voltage and constant current is a breakthrough; the relationship between spear and shield, must be considered separately; constant current source load adjustment rate is 1% (mA) /V, is not up to the constant current effect; the higher the cost into more ideas, is proportional to the risk.

Characteristic

It is the most economical to use the existing switching power supply;

Constant pressure and constant current technology is inevitable;

Creativity is effective in stable product technology.

Compared with the constant current mode.