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 reasons for the light decay and color drift are the products of cottage manufacturers. The main reason is the unreasonable heat dissipation design. Relatively speaking, the problem of LED lamp driving power is much more serious, which is the main cause of dead lights or flicker. That is to say, LED lamp driving power has become a shortcoming of the quality of LED lamps. According to the barrel theory, LED lamp driving power The life span is the life span of the LED lamp.
Conventional lighting street lamps are separated from the lamp head and the power supply. The failure is usually the lamp head-high-pressure sodium lamp. The national standard of high-pressure sodium lamp stipulates a one-year warranty period. The street lamp management unit will store a certain number of sodium lamps. The main parameters such as the size and power of the main parts are unified and interchangeable.
The current failure of LED lights is mainly in the power supply, so the main problem is to solve the power supply problem. Due to the current lack of mandatory unified standards for LED power supplies, the power supplies on the market are separate, single-channel, multi-channel, and different sizes, which are difficult to replace. With the emergence of ultra-high-power LED street lights and LED tunnel lights on the market, LED drive power supply failures are frequent, and LED street light drive power supplies are mostly built-in design, which often leads to difficult maintenance of led light power supply, and some manufacturers lack after-sales maintenance services, so The owner's complaint stated that after the media's exaggerated publicity, it caused the public's misunderstanding of LED lights and affected the reputation of the LED industry.
1. Abandon more than 4 outputs, develop single or two outputs, abandon large current and super large current, and develop small current.
The more the number of output channels is, the more complicated it is. The current interference between different outlets is very costly to solve. If it is not solved, the failure rate is higher. In addition, the greater the number of output channels, the greater the total output current, and the current is the main cause of heat generation. The voltage itself does not directly cause heat generation. In short, the heat generation is proportional to the square of the current, that is, the current increases to the original If it is doubled, the calorific value will be increased by 4 times, the current will be increased by 3 times, and the calorific value will be increased by 9 times. To sum up, the failure rate of single or two-output LED lamp power supply will be reduced a lot.
2. Intelligent control is one of the advantages of LED lamps, and power supply is the key to intelligent control.
Intelligent control has the most mature conditions and the most obvious effects in LED street lamp and LED tunnel lamp lighting applications. Intelligent control can achieve stepless control of lamp power at different time periods and according to road traffic density, which not only meets application requirements but also achieves huge energy saving. As a result, it can save a lot of money for the competent highway unit. The application of tunnel lighting can not only save energy, but also automatically adjust the brightness of the entrance and exit of the tunnel according to the brightness outside the tunnel to provide the driver with a visual transition stage to ensure driving safety.
3. Abandon high-power and super-high-power, and choose medium and small power supplies with higher stability.
Because the greater the power, the greater the heat, and the more compact the components inside, which is not conducive to heat dissipation, and the temperature is the culprit of the power supply failure. In addition, the development of low-power power supply is relatively mature, with advantages in stability and cost. In fact, many high-power power supply solutions have not been time-tested and proven in practice. They are projects that have been launched in a hurry, and they are all experimental products, so failures are endless. In contrast, due to the early development of small and medium-sized power supplies, the technical solutions are much more mature.
4. Heat dissipation and protection are the main external factors of power failure.
Not only does the power supply itself generate heat, but the lamp also generates heat. How to reasonably radiate these two heat sources is a problem that the lamp design engineer must consider. It is necessary to prevent excessive concentration of heat to form a heat island effect and affect the life of the power supply. It is a good choice to use a separate power supply solution.
5. Feasibility of maintenance.
The failure of the power supply cannot be completely avoided, and Chengdu Chaoyue Optoelectronics has proposed the principle of ease of maintenance. Only when the replacement of the power supply is as simple as the replacement of the light source of the conventional lighting, can the user be happy. Even if the power supply is broken, the mood will not be too bad, and the user's mood determines the LED light manufacturer's fate.
6. Protection performance.
Protection problems are also very important. The penetration of moisture may cause a short circuit of the power supply. Sand and dust on the shell will affect the heat dissipation of the power supply. Exposure may easily cause high temperature and the aging of wires and other components. From practical experience, the rotation The failure rate of the wiring plug is high, and most of them are caused by water leakage.
7. Modular design.
Modular design has become the trend of the day, and we must find a way to integrate the power supply of the module. 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 a standardized interface to allow LEDs from different manufacturers The lamp power supply can be universal.
Summary: It is best to use a split design for the LED lamp power supply, and pay attention to the reliability and life of the power supply. Even if a little cost is increased, only by standing at the customer's perspective to design the product can the enterprise develop for a long time.
About this project
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