Several practical experiences of LED lamp driver power supply

　　In recent years, with the continuous development of LED lamp packaging technology and heat dissipation technology, the stability of LED lamps has reached a relatively good level. The main causes of light decay and color drift are some counterfeit manufacturers' products, which are mainly due to unreasonable heat dissipation design. Relatively speaking, the problem of LED lamp driver power supply is much more serious, which is the main reason for dead light or flickering. In other words, LED lamp driver power supply has become the short board of LED lamp quality. According to the wooden barrel theory, the life of LED lamp driver power supply is the life of LED lamp.

　　Conventional lighting street lamps have separate lamp holders and power supplies. Usually, the lamp holder - the high-pressure sodium lamp - fails. The national standard for high-pressure sodium lamps stipulates a one-year warranty period. Street lamp management units will store a certain number of sodium lamps. High-pressure sodium lamps have mature national standards, and their main parameters such as size and power of main accessories are unified and interchangeable.

　　At present, the main fault of LED lamps is the power supply, so the main thing to do is to solve the power supply problem. Since there is still a lack of mandatory unified standards for LED power supplies, the power supplies on the market are independent of each other, single-channel, multi-channel, and of different sizes, making them difficult to replace. With the emergence of ultra-high-power LED street lights and LED tunnel lights on the market, LED driver power supplies frequently fail. In addition, LED street light driver power supplies mostly use built-in designs, which often makes it difficult to maintain the LED light power supply. In addition, some manufacturers lack after-sales maintenance services, so owners complain a lot. After exaggerated publicity by the media, the public has misunderstood LED lights, affecting the reputation of the LED industry.

　　1. 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.

　　2. 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.

　　3. Give up high power and ultra-high power and choose small and medium power sources 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. Furthermore, small-power power supplies are relatively mature, and have advantages in stability and cost. In fact, many high-power power supply solutions have not been verified by time and practice. They are all hastily launched projects and experimental products, so failures are endless. In contrast, small and medium-power power supplies have been developed earlier and the technical solutions are much more mature. 　　4. 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.

　　5. Feasibility of maintenance.

　　Power failure cannot be completely avoided, so Chengdu Chaoyue Optoelectronics has proposed the principle of simple maintenance. Only when the replacement of the power supply is as easy 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 users determines the fate of LED lamp manufacturers.

　　6. Protective 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.

　　7. 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 lamp power supplies from different manufacturers can be universal.

　　Summary: It is best to use a split design for LED lamp power supply, and at the same time pay attention to the reliability and life of the power supply, even if it increases the cost a little. Only by designing products from the customer's perspective can the company achieve long-term development.