LED lighting applications are the trend of the times. However, in the past, the output brightness is low, the stability is not good, and the lifespan is difficult to prolong, which hinders the market. In view of this, diversified sensor technology came into being and realized in different production methods without sacrificing. Brightness and longevity highlight the advantages of LED energy saving and environmental protection, which will help accelerate the penetration of LED lighting market.
Light-emitting diode (LED) lighting is becoming the industry's technology of choice, especially in harsh environmental conditions where LED solutions are durable and never fail completely, but their amount of light does diminish over time. Using automatic dimming to measure the LED light output while adjusting the power supply maintains a constant light output throughout the life of the lamp. This maintains stable brightness in different production modes and greatly extends the life of the lamp. This article will explain how to use various sensor technologies and apply circuit examples for street, office and factory lighting.
System level ecological design must be comprehensive
In the case of Ecodesign, for a specific application, prolonging the service life is always desirable because it is directly related to the Ecological Impact. This is not as easy as imagined, because innovation never stops, the possibilities of new standards and new applications need to be taken into account, and new functions need to be implemented. It's important not to implement only the minimum standards, but to build better products that are preloaded with new features and that provide some flexibility. NASA's Mars Rover is a good example of a large amount of technical support to help with the introduction of the program and a significant advance in program start-up time.
In addition to flexibility, the possibility of having such a long lifetime of LEDs is also critical. There are three types of effects that need to be considered: the effects of rapid changes (such as turn-on current), the effects of slow changes (such as drift), and external influences. .
On-current is an important stress for all applications. Large bus capacitors in the power supply are the main cause of this stress. In addition, an ambiguous state when the power is turned on may put stress on the application. To avoid these conditions, Failure Mode and Effects Analysis (FMEA) should be used throughout the design time to carefully analyze circuit performance. In the completed application design, it is also necessary to check the current and temperature during the turn-on and turn-off process. At the design time, two points may not be noticed, and the result often leads to field failure in the later stage.
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