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LED lamp quality and drive power relations part 1


LED is the abbreviation of "LIGHT EMITTING DIODE", which is referred to as light emitting diode in Chinese. Because of its many advantages, such as environmental protection, long life, high photoelectric efficiency (current light efficiency has reached 100LM/W), and earthquake resistance, it has been applied rapidly in various industries in recent years. Development, in theory, LED life of about 100,000 hours, but in the actual application process, some LED lighting designers lack of understanding of the LED drive power or improper use or blind pursuit of low-cost, resulting in LED lamp product life is greatly shortened The poor LED lamp life is less than 2000 hours, and some are even lower. As a result, the advantages of LED lamps are not well utilized.

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 example of high-power 1W white LED as an example, according to the LED current, voltage change rules to do a brief description, generally 1W white light application forward voltage of about 3.0-3.6V, that is, when the nominal 1W LED In the 350mA current flow, the voltage across it may be 3.1V, may also be 3.2V or 3.5V may also be other values, in order to ensure the lifetime of the 1WLED, the general LED manufacturer recommends the lamp factory to use the 350mA current Driving, when the forward current through the LED reaches 350 mA, the positive voltage at both ends of the LED increases very little, which will cause the LED forward current to rise substantially, causing the LED temperature to rise linearly, thereby accelerating the LED light decay. This shortens the life of the LED and even burns the LED in severe cases. Due to the particularity of the voltage and current changes of the LED, strict requirements are imposed on the power supply that drives the LED.

LED drive power is the key to LED lighting, it is like a person's heart, to create high-quality LED lighting for lighting must give up the constant voltage drive LED.

Many high-power LED packaging plants now pack a number of individual LEDs in parallel and in series to produce a single 20W, 30W or 50W or 100W or even higher power LED, even though these individual LEDs are pre-packaged. All of them are strictly selected and paired, but due to the small number of internal components, there are dozens or hundreds of single-chip LEDs. Therefore, the packaged high-power LED products still have great differences in voltage and current. Compared to a single LED (usually a single white, green, blue working voltage in the 2.7-4V, a single red, yellow, orange light operating voltage in the 1.7-2.5V) more difference! (Remind that the LED lighting factory just launched can not ignore the packaging quality of LED light source).