The main design challenges for LED lighting applications include the following: heat dissipation, high efficiency, low cost, dimming without flicker, wide dimming, reliability, safety, and elimination of color cast. These challenges need to be addressed by a combination of appropriate power system topology, drive circuit topology, and mechanical design.
Since the LED light must be able to fit within the original old socket, heat dissipation is a big problem that must be overcome. Strictly speaking, this can be solved by mechanical engineering techniques. The responsibility of LED system manufacturers is to develop new technologies and try to increase the brightness of LEDs (ie the amount of lumens per unit of power).
The relatively high cost of LEDs is a major obstacle to the large-scale take-off of the LED lighting market. For example, Alexander Sommer, Director of Product Marketing, Power Management Business Unit, Infineon Technologies, Inc. said: "Most LED lighting applications that are less than 25W are marker lights, signage lights, and alternatives to standard incandescent and halogen lamps. But with existing The initial cost of LEDs is still a major barrier to entry into the mass market compared to fluorescent and incandescent technology."
Xu Ruibao, engineer of Cytech's product and design department, also agrees that the main commercialization challenge is cost. He said: "At present, LED lighting systems of various powers are achievable on the circuit. The technical challenges come from the requirements of terminal applications, such as automotive applications, taking into account optical design and overall thermal design. Commercial deployment The challenge comes mainly from LED costs."
Another idea to prevent the LED from working overheating for a long time is to use a dimming solution. Sang CheolHer, marketing manager for high-voltage IC products at Fairchild Semiconductor, said: "Comparing fluorescent and incandescent lamps, dimming solutions are an important way to reduce LED power consumption. This solution is implemented using dimming controllers, especially for less than 25W. The LED driver solution is more important because of the small PCB size and limited package space, and the heat dissipation problem is inevitable."
In fact, in this power range, LED lights will replace halogen lamps and compact fluorescent lamps (CFLs). In addition, in order to get rid of heat dissipation problems, advanced technologies must remove passive components such as electrolytic capacitors that are sensitive to temperature changes. However, most current LED driver solutions are based on and based on the power supply topology, so temperature limits should be considered, as general products are usually based on commercial standards, but the lights must be able to adapt to harsh environments such as Industrial environment.
Architectural choice for LED lighting design
The choice of LED lighting system architecture depends on whether your design goal is low cost, high efficiency or minimum PCB area. In general, LED lighting systems smaller than 25W do not require power correction, so simple topology such as PSR or Buck topology can be used. 25W-100W LED lighting applications require power calibration, so single-stage PFC, quasi-resonant (QR) PWM or flyback topologies are typically used. LED lighting applications above 100W generally use more efficient LLC topology and dual-stage PFC.
LED Street Light Heatsink, LED Street Light Housing, LED Street Light Parts
LED Street Light Heatsink
LED Street Light Heatsink, LED Street Light Housing, LED Street Light Parts
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