Indoor LED driver supplier to share with you:
Because LEDs are sensitive semiconductor devices and have negative temperature characteristics, they need to be stable and protected in the application process, which leads to the concept of driving. The requirements of LED devices for driving power are almost harsh. Unlike ordinary incandescent light bulbs, LEDs can be directly connected to 220V AC mains. LEDs are driven by low voltages of 2 to 3 volts, and complex conversion circuits must be designed. Different uses of LED lights must be equipped with different power adapters. In the international market, foreign customers have very high requirements for the efficiency conversion, effective power, constant current accuracy, power supply life, and electromagnetic compatibility of LED driving power supplies. When designing a good power supply, these factors must be considered comprehensively, because the power supply Is as important as the human heart.
Fundamental contents:
When LEDs are used as displays or other lighting equipment or backlight sources, they need to be driven with constant current, the main reasons are:
1. Avoid driving current exceeding the maximum rating and affecting its reliability.
2. Obtain the expected brightness requirements and ensure the consistency of the brightness and chromaticity of each LED.
Driving characteristics: According to the power consumption rules of the power grid and the characteristics of LED driving power, the following points must be considered when selecting and designing LED driving power:
1. High reliability: Especially like the driving power of LED street lights, installed at high altitude, the maintenance is not convenient, and the maintenance cost is also large.
2. High efficiency: LED is an energy-saving product, and the efficiency of the driving power should be high. It is especially important for the structure where the power supply is installed in the luminaire. Because the luminous efficiency of LEDs decreases as the temperature of the LED increases, the heat dissipation of the LED is very important. The efficiency of the power supply is high, its power consumption is small, the heat generation in the lamp is small, and the temperature rise of the lamp is reduced. It is beneficial to delay the light decay of LED.
4. Driving method: There are two types of current: one is a constant voltage source for multiple constant current sources, each constant current source supplies power to each LED individually. In this way, the combination is flexible, and LED failures along the way will not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, LEDs run in series or parallel. Its advantage is a little lower cost, but poor flexibility, but also to solve the problem of one LED failure, does not affect the operation of other LEDs. Both forms. Multi-channel constant current output power supply mode will be better in terms of cost and performance. Maybe the mainstream direction in the future.
5. Surge protection: LED's ability to resist surge is poor, especially its ability to resist reverse voltage. It is also important to strengthen this protection. Some LED lights are installed outdoors, such as LED street lights. Due to the induction of the grid load and the induction of lightning strikes, various surges will be invaded from the grid system, and some surges will cause damage to the LEDs. Therefore, the LED driving power supply must have the ability to suppress the intrusion of the surge and protect the LED from damage.
6. Protection function: In addition to the normal protection function of the power supply, it is best to add LED temperature negative feedback to the constant current output to prevent the LED temperature from becoming too high.
7. Protection: The type of the lamp is externally installed, the power supply structure should be waterproof and moistureproof, and the shell should be resistant to sunlight.
8. The life of the driving power supply must match the life of the LED.
9. To meet the requirements of safety regulations and electromagnetic compatibility.
With the increasing application of LED, the performance of LED driving power will be more and more suitable for LED requirements.
Our company provides high-quality ultra thin led drivers. If you have any needs for our products, please feel free to contact us.
Ultra Thin Led Driver
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