[Additional icing on the cake] Reasonable driver design optimizes LED lighting
LED lighting has become a mainstream technology with great energy saving potential. In China alone, if one third of the country's lighting market uses LEDs, it is expected to save 100 million kWh of electricity and reduce CO2 emissions by 29 million per year. However, there is also an obstacle to how to control the voltage flicker problem, which is a common problem for home or road lighting applications. Let's take a closer look at the problem and learn about some of the drive designs that support dimming and flicker-free operation.
For incandescent lamps, dimming is possible with a simple, low-cost, and advanced triac dimmer; such dimmers are everywhere. For solid-state lighting (SSL) or LED retrofit lamps to be truly successful, they must be dimmed with existing controllers and wiring.
But people have encountered many problems in the process of dimming the LED lights. The most typical problems are flicker and other bad performance. To understand this phenomenon, it is first necessary to understand the working principle of the triac, the LED technology and how the two interact.
In a typical triac dimmer, potentiometer R2 is used to adjust the phase angle of the triac, which illuminates each of the main ACs when VC2 exceeds the diode's turn-on voltage. The edge of the voltage. When the triac current is lower than its holding current, it turns off and must wait for C2 to reapply before it can be turned back on. The applied voltage and current through the filament are a function of the phase angle of the dimming signal, and the value can float in the range of approximately 0 to 180°.
LED lamps typically include an array of LEDs that provide uniform light diffusion, and these arrays are connected in series. The brightness of each LED is a function of the current through it, and these LEDs typically have a forward voltage drop of approximately 3.4V (and possibly floating between 2.8V and 4.2V). To emit luminosity consistent with adjacent luminaires, the current supply used to drive the LED array must be precisely controlled to ensure a stable supply.
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