Analysis of the relationship between the quality of LED lamps and the driving power.

Due to its many advantages, such as no toxic substances, environmental protection, long lifespan, and high photoelectric efficiency, LEDs have been rapidly developed in various industries in recent years. Theoretically, the service life of LEDs is about 100,000 hours. However, in the actual application process, some LEledligtingfactoryD Lamp designers have insufficient knowledge or improper selection of LED drive power, which greatly shortens the life of LED lamps.

Due to the particularity of LED processing and manufacturing, the current and voltage characteristics of LEDs produced by different manufacturers and even the same manufacturer in the same batch of products have large individual differences. Now take the typical specifications of high-power 1W white light LED as an example, and make a brief description according to the law of LED current and voltage change. Generally, the forward voltage of 1W white light application is about 3.0-3.6V. In order to ensure the life of 1W LED, the general LED manufacturer recommends The lamp factory uses 350mA to drive. When the forward current through the LED reaches 350mA, the forward voltage at both ends of the LED will increase slightly, which will cause the LED forward current to rise significantly, and the LED temperature will become Rising linearly, thereby accelerating the LED light decay, shortening the life of the LED, and even burning the LED in severe cases. Due to the particularity of the voltage and current changes of the LED, strict requirements are placed on the power supply for driving the LED.

LED drive power is the key to LED lamps. It is like a person's heart. To manufacture high-quality LED lamps for lighting, you must abandon constant voltage driving LEDs.

At present, many manufacturers produce LED lighting products (such as guardrails, lamp cups, projection lights, garden lights, etc.), which use resistance and capacitance to step down, and then add a zener diode to stabilize the voltage to supply power to the LED, so as to drive the LED. There are great shortcomings. Firstly, the efficiency is low. It consumes a lot of power on the step-down resistor, which may even exceed the power consumed by the LED, and cannot provide high-current drive, because the larger the current, the power consumed on the step-down resistor is reduced. The bigger it is, there is no guarantee that the current through the LED will not exceed its normal working requirements. When designing the product, the voltage at both ends of the LED will be used to drive the power supply, which is at the expense of the brightness of the LED. Using the resistance and capacitance step-down method to drive the LED, the brightness of the LED cannot be stabilized. When the power supply voltage is low, the brightness of the LED becomes dim, and when the power supply voltage is high, the brightness of the LED becomes brighter. Of course, the biggest advantage of driving LEDs with resistance and capacitance step-down methods is low cost.