Talking about the practical experience of LED lamp driving power supply

February 15, 2020

In recent years, LED lamp packaging technology and heat dissipation technology have been continuously developed. The stability of LED lamps has reached a relatively good level. The occurrence of light decay and color drift is mainly the products of some cottage manufacturers. The main reason is the unreasonable heat dissipation design. Relatively speaking, the problem of LED light driving power supply is much more serious, which is the main cause of dead light or flashing. That is to say, LED light driving power supply has become a short board of LED light quality. According to wooden barrel theory, LED light driving power supply The life expectancy is the life of the LED light.

Conventional lighting street lamps are separate from the power supply. Generally, the lamp head--high-pressure sodium lamp, high-pressure sodium lamp national standard stipulates that the warranty period is one year. The street lamp management unit will store a certain number of sodium lamps. The high-pressure sodium lamp has mature national standards. The main parameters such as the size and power of the main components are uniform and interchangeable.

The current LED lamp failure is mainly in the power supply, so the main problem is to solve the power 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 of different sizes, which is difficult to replace. With the emergence of super-power LED street lights and LED tunnel lights on the market, LED drive power failures frequently occur, and LED street light drive power supplies often use built-in design, which often causes difficulties in the maintenance of led lamp power supply, and some manufacturers lack after-sales maintenance services, so The complaints of the owners have caused the public to misunderstand the LED lights after the exaggerated publicity of the media, which has affected the reputation of the LED industry.

1. Give up 4 or more outputs, develop single or two outputs, abandon large currents and large currents, and develop small currents.

The more the number of output channels is more complicated, the current interference between different outlets is solved, and the cost is high. If not solved, the failure rate is high. In addition, the more the number of output channels, the larger the total output current, and the current is the main cause of heat generation. The voltage itself does not directly cause heat. Simply speaking, the heat is proportional to the square of the current, that is, the current increases to the original. 2 times, the heat will increase to 4 times, the current will increase to 3 times, and the heat will increase to 9 times. In summary, the single- or two-output LED lamp power failure rate will be much lower.

2, intelligent control is one of the advantages of LED lamps, and power is the key to intelligent control.

Intelligent control is the most mature condition in LED street light and LED tunnel light lighting application. Intelligent control can realize stepless control of lamp power according to road traffic density in different time periods, which not only meets application requirements, but also realizes huge energy saving. The effect can save a lot of money for the highway supervisory unit. The application in tunnel lighting not only saves energy, but also automatically adjusts the brightness of the tunnel entrance and exit according to the brightness outside the tunnel, providing the driver with a visual over-stage to ensure driving safety.

3, give up high power, super high power, choose a medium and small power supply with higher stability.

Because the greater the power, the greater the heat, the more compact the components inside, which is not conducive to heat dissipation, and the temperature is the culprit of power failure. Moreover, the low-power power supply is relatively mature in development, and has advantages in terms of stability and cost. In fact, many high-power power solutions have not been time-tested and proven in practice. They are all rushed projects, all of which are experimental products, so the faults are endless. In contrast, small and medium-sized power supplies have matured due to their earlier development.

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

Not only the power supply itself will heat up, but also the lamps will heat up. How to properly dissipate these two heat sources is a problem that the lighting design engineer must consider. It is necessary to prevent excessive heat concentration, form a heat island effect, and affect the life of the power supply. A split power solution is a good choice.

5. Feasibility of maintenance.

The problem of power failure cannot be completely avoided. Chengdu Chaoyue Optoelectronics proposed the principle of maintenance simplicity. Only when the replacement of the power supply is made as simple as the replacement of the light source of the conventional illumination 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 lamp manufacturer. fate.

6, protection performance.

The protection problem is also very important. The penetration of moisture may cause short circuit of the power supply. The dust on the outer casing will affect the heat dissipation of the power supply. Exposure will easily cause high temperature and aging of wires and other components. From the experience in actual use, the rotation The failure rate of the wiring plug is high, and most of them are faults caused by water leakage.

7, modular design.

Modular design has become the trend of today. It is necessary to find a way to integrate the module power supply. If the power supply can solve the maintenance problem by plugging and unplugging, it will be welcomed by users. At the same time, it is necessary to establish interface standardization and let LEDs of different manufacturers. The lamp power supply can be used universally.

Summary: LED light power supply is best to use split design, while paying attention to the reliability and life of the power supply, even if it adds a little cost, only by standing from the customer's point of view to design the product, the enterprise can get long-term development.

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