In the LED power supply product design process, engineers need to deal with more than just circuit design problems, more LED power supply drive options, LED maintenance and maintenance of the latter part of the maintenance and repair work. Xiaobian special finishing some of the LED maintenance and LED power supply design process in the practical experience, through the form of questions and answers with the new engineers to share, let us take a look at the following bar.
The first question: in the design of LED power products, how to do to design high-quality LED driver circuit?
I believe a lot of engineers engaged in LED power supply design are very clear, LED is currently the world's research and development of a long-life electronic components, the ideal situation of its LED life of up to 50,000 hours, but the application circuit design is unreasonable, LED Power supply heat design is not good and other factors, will affect its service life. The face of this problem, the use of electrolytic capacitors can save a new generation of LED driver IC, is a practical solution.
For engineers engaged in LED power and peripheral product development, in the design of a new generation of driver IC, we must break the traditional DC-DC topology design thinking, you can use constant power, to abandon the hysteresis control of the buck Design ideas for new product development, using constant frequency current control is also a good way. In addition, high-quality LED driver circuit should be simple to reduce the number of components used, and effectively improve the PWM controller duty cycle and so on. To meet the above conditions, the design of a new generation of driver IC to meet the high-quality drive circuit design requirements.
The second question: What is the principle of the breakdown of the electrostatic breakdown of the LED? What is the cause of the breakdown?
In the process of debugging the LED power supply, I believe that engineers have encountered after the prototype, LED components were breakdown of the situation, which is a considerable part of the breakdown by static electricity. LED as a semiconductor, its own PN junction is directly exposed to the outside, it is easy to contact static electricity. When the two electrodes on the electrode polarity of the different charge accumulated to a certain extent, and can not get timely release, then the charge energy once the LED chip exceeds the maximum bear value, the charge will be a very short moment in the LED two electrode layers Between the conductive layer will be formed between the conductive layer above 1400 ℃ high temperature, high temperature will melt between the conductive layer into some small holes, which is our LED power supply test process, often encountered in the LED hit Wear the phenomenon.
LED power supply in the new product prototype test, once encountered the phenomenon of electrostatic breakdown of LED components, indicating the design of the circuit there are unreasonable factors exist, then the engineers need to adjust the circuit design and re-test.