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LED maintenance and LED power supply design experience sharing, don't wait

2019-07-12
Today, Xiaobian specially compiled some practical experiences in the process of LED overhaul and LED power supply design. I will share it with the newcomers engineers through the form of question and answer. Let us take a look at it.

In the design process of LED power products, engineers need to deal with not only circuit design problems, but also the choice of driving scheme for LED power supply, the maintenance of LED life and the maintenance and overhaul work in the later stage. Today, Xiaobian specially compiled some practical experiences in the process of LED overhaul and LED power supply design. I will share it with the newcomers engineers through the form of question and answer. Let us take a look at it.

The first question: When designing LED power products, what can we do to design a high-quality LED driver circuit?

I believe that many engineers engaged in LED power supply design are very clear that LED is a long-life electronic component developed in the world. Under ideal conditions, the working life of LED can reach 50,000 hours, but the application circuit design is unreasonable, LED Factors such as poor heat dissipation design of the power supply will affect its service life. In the face of this problem, the use of a new generation of LED driver ICs that can eliminate electrolytic capacitors is a practical solution.

For engineers engaged in the research and development of LED power supplies and peripheral products, when designing a new generation of driver ICs, it is necessary to break the traditional DC-DC topology design thinking, and can use the constant power and the hysteresis of the hysteresis control. Design ideas for new product development, using constant frequency constant current control is also a good way. In addition, the high-quality LED driver circuit is designed to be simple, reduce the number of components used, and effectively increase the duty cycle of the PWM controller. To meet the above conditions, the new generation of driver ICs designed to meet the design requirements of high-quality drive circuits.

The second question: What is the principle of LED breakdown by static electricity? What is the principle of breakdown?

During the debugging of the LED power supply, it is believed that engineers have encountered the breakdown of the LED components after the prototype is turned on, and a considerable part of them are penetrated by static electricity. As a semiconductor, the LED itself has a PN junction that is directly exposed to the outside and is easily exposed to static electricity. When the charge of different polarity on the two electrodes of the LED accumulates to a certain extent and is not released in time, once the charge energy exceeds the maximum value of the LED chip, the charge will be in the electrode layer of the LED in a very short time. Discharge between them, and a high temperature above 1400 ° C will be formed between the conductive layers. The high temperature will melt the conductive layers into small holes. This is the LED hit that we often encounter during the LED power test. Wearing a phenomenon.

When testing the new product prototype of the LED power supply, once the LED component is electrostatically broken down, it indicates that there are unreasonable factors in the designed circuit. At this time, the engineer needs to timely adjust the circuit design and retest.

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