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首页> 外文期刊>Industrial Electronics Magazine, IEEE >Get the LED Out: Experimental Validation of a Capacitor-Free Single-Inductor, Multiple-Output LED Driver Topology
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Get the LED Out: Experimental Validation of a Capacitor-Free Single-Inductor, Multiple-Output LED Driver Topology

机译：释放LED：无电容单电感，多输出LED驱动器拓扑的实验验证

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摘要

This article presents a new approach for driving multicolor red?green?blue?white ( RGBW) high-current light-emitting diodes (LEDs) for general lighting. The physical advantages in LED applications can be improved by elementary changes in the topology. The presented prototype demonstrator has superior advantages in complexity, form factor, and cost compared to state-of-the-art multicolor LED drivers. A single inductor in parallel to the LED strings is used to supply multiple different LED strings without additional output capacitors. For energy efficiency, the well-known continuous and discontinuous conduction modes (CCM and DCM) are implemented. A novel all-digital current control strategy is used so that no voltage measurements have to be performed, even for light load detection or idle time control in DCM. The irrelevance of any voltage control and the negligence of storage capacitors dramatically reduce the system?s form factor and increase the LED driver reliability. Dimming has been applied with hybrid amplitude and pulsewidth modulation (AM-PWM) control. Thus, color mixing is done by a continuous time integral of the discrete LED light spectra. A discrete prototype demonstrator has been implemented, and further constraints to develop a full integrated circuit (IC) are being evaluated. The discrete demonstrator runs at 12-V dc input voltage with a maximum current of 200 mA to run high-current RGBW LED strings. The peak efficiency of 77.5% is limited by the choice of the applied N-type metal-oxide-semiconductor (NMOS) transistors, which are special and unique on the market for this topology. The high switching frequency of above 1 MHz during CCM ensures a flicker-free color resolution of above 10 b.
机译：本文提出了一种用于驱动通用照明的多色红色，绿色，蓝色，白色（RGBW）大电流发光二极管（LED）的新方法。 LED应用中的物理优势可以通过拓扑中的基本更改得到改善。与最新的多色LED驱动器相比，该演示器在复杂性，外形尺寸和成本方面具有优越的优势。与LED灯串并联的单个电感器用于为多个不同的LED灯串供电，而无需额外的输出电容器。为了提高能源效率，实施了众所周知的连续和不连续传导模式（CCM和DCM）。使用了一种新颖的全数字电流控制策略，因此即使对于DCM中的轻载检测或空闲时间控制，也无需执行电压测量。任何电压控制的无关紧要和存储电容器的疏忽都大大降低了系统的外形尺寸，并提高了LED驱动器的可靠性。调光已应用于混合幅度和脉冲宽度调制（AM-PWM）控制。因此，通过离散LED光谱的连续时间积分来完成颜色混合。已经实现了分立的原型演示器，并且正在评估开发完整集成电路（IC）的其他限制。分立式演示器以12V直流输入电压运行，最大电流为200mA，以运行高电流RGBW LED灯串。 77.5％的峰值效率受到所应用的N型金属氧化物半导体（NMOS）晶体管的选择的限制，这种晶体管在市场上对于这种拓扑结构是特殊且独特的。 CCM期间高于1 MHz的高开关频率确保了高于10 b的无闪烁色彩分辨率。

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