Engineer experience: seven tips for LED driver power design

　　It is not difficult to design LED driver power supply . The experience of predecessors can often help engineers avoid many detours. The ancients said: The nature of a gentleman is not different, but he is good at making use of things. Being good at learning from others' experience and skills can not only help us avoid mistakes, but also help engineers find the fastest and most effective design method and save time and cost. This article will share with you seven LED driver power supply design skills summarized by experts after a lot of experiments.

　　The design of LED driver power supply is very important for manufacturers. So, how should we better design LED driver power supply? Let's take a look at the seven LED driver power supply design tips summarized by experts.

　　1. Intelligent control is one of the advantages of LED lamps, and power supply is the key to intelligent control.

　　Intelligent control is most mature and effective in the application of LED street lights and LED tunnel lights. Intelligent control can realize stepless control of lamp power in different time periods according to the density of road traffic, which not only meets the application requirements but also achieves huge energy-saving effects, and can save a lot of money for highway management units. The application of tunnel lighting can not only save energy, but also automatically adjust the brightness of tunnel entrances and exits according to the brightness outside the tunnel, providing drivers with a visual transition stage to ensure driving safety.

　　2. Give up high power and ultra-high power and choose small and medium power power supplies with higher stability.

　　Because the greater the power, the greater the heat generated, the more compact the components inside, which is not conducive to heat dissipation, and temperature is the culprit of power supply failure. Moreover, small power supply is relatively mature, and has advantages in stability and cost. In fact, many high-power power supply solutions have not been verified by time and practice. They are hastily launched projects and experimental products, so failures are endless. In contrast, small and medium-power power supplies are much more mature in technical solutions because they were developed earlier.

　　3. Heat dissipation and protection are the main external factors of power supply failure.

　　Not only the power supply itself will generate heat, but also the lamp will generate heat. How to properly dissipate these two heat sources is a problem that lamp design engineers must consider. It is necessary to prevent excessive concentration of heat, forming a heat island effect, and affecting the life of the power supply. Using a separate power supply solution is a good choice.

　　4. Feasibility of maintenance.

　　Power failure cannot be completely avoided, Chengdu Chaoyue Optoelectronics has proposed the principle of simple maintenance. Only when the replacement of the power supply is as simple as the replacement of the light source of conventional lighting, can users be happy. Even if the power supply is broken, the mood will not be too bad, and the mood of the user determines the fate of the LED lamp manufacturer. 　　5. Protection performance.

　　Protection is also very important. The penetration of water may cause a short circuit in the power supply . The dust on the outer casing will affect the heat dissipation of the power supply. Exposure to the sun can easily cause high temperature and aging of wires and other components. From actual experience, the failure rate of rotary wiring plugs is relatively high, and most of the failures are caused by water leakage.

　　6. Modular design.

　　Modular design has become the trend today, and we must find a way to integrate the module power supply . If the power supply can solve the maintenance problem by plugging and unplugging, it will definitely be welcomed by users. At the same time, it is necessary to establish interface standardization so that LED light power supplies from different manufacturers can be universal.

　　7. Abandon more than 4 outputs and develop single or dual outputs; abandon large current and ultra-large current and develop small current.

　　The more output paths there are, the more complicated it is. It is very costly to solve the current interference between different output paths. If it is not solved, the failure rate will be high. In addition, the more output paths there are, the greater the total output current will be. Current is the main cause of heat generation. Voltage itself does not directly cause heat generation. Simply put, the heat generation is proportional to the square of the current. That is to say, if the current increases to 2 times, the heat generation will increase to 4 times. If the current increases to 3 times, the heat generation will increase to 9 times. In summary, the failure rate of LED lamp power supply with single or dual output will be much lower.

　　Through the above seven points of summary, engineers will find it more convenient and save more time when designing LED driver power supplies.