精品日产一匹二匹三匹四匹五匹-久久冲刺内射高潮-无码熟妇人妻av在线影片软件-新狼窝色AV性久久久久久-精品亚洲成a人片在线观看

LED has developed rapidly in various industries in recent years due to its many advantages such as no toxic substances, environmental protection, long lifespan, and high photoelectric efficiency. In theory, the service life of LED is around 100000 hours. However, in practical applications, some LEledlightingfactoryD lamp designers have insufficient understanding or improper selection of LED driver power, resulting in a significantly shortened lifespan of LED lamp products.

Due to the unique nature of LED processing and manufacturing, there are significant individual differences in the current and voltage characteristics of LEDs produced by different manufacturers or even the same manufacturer in the same batch of products. Taking the typical specifications of high-power 1W white LED as an example, a brief explanation will be given based on the current and voltage changes of the LED. Generally, the forward voltage for 1W white LED applications is around 3.0-3.6V. To ensure the lifespan of 1W LED, LED manufacturers generally recommend using 350mA current to drive. When the forward current passing through both ends of the LED reaches 350mA, a small increase in the forward voltage at both ends of the LED will cause a significant increase in the forward current of the LED, Make the LED temperature rise in a straight line, thereby accelerating LED light decay, shortening the lifespan of the LED, and even burning out the LED in severe cases. Due to the unique changes in voltage and current of LEDs, strict requirements are put forward for the power supply driving LEDs.

The LED driver power supply is the key to LED lighting, just like a person's heart. To manufacture high-quality LED lighting fixtures for lighting, it is necessary to give up the constant voltage method of driving LED.

Currently, many manufacturers produce LED light products (such as guardrails, light cups, projection lights, courtyard lights, etc.) that use resistance and capacitance voltage reduction, and then add a voltage regulator diode to stabilize the power supply to the LED. This method of driving the LED has great drawbacks. Firstly, it is inefficient and consumes a large amount of electricity on the voltage reduction resistor, which may even exceed the energy consumed by the LED, and cannot provide high current driving because the higher the current, The greater the electrical energy consumed on the step-down resistor, the more it cannot guarantee that the current flowing through the LED does not exceed its normal working requirements. When designing products, reducing the voltage at both ends of the LED is used to power and drive, which is at the cost of sacrificing the brightness of the LED. By using resistance and capacitance voltage reduction methods to drive LED, the brightness of the LED cannot be stable. When the power supply voltage is low, the brightness of the LED decreases, while when the power supply voltage is high, the brightness of the LED becomes brighter. Of course, the biggest advantage of using resistive and capacitive voltage reduction methods to drive LEDs is their low cost.