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Peak Current Control of Multichannel LED Driver With Selective Dimming

机译：选择性调光的多通道LED驱动器的峰值电流控制

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摘要

A novel selective dimming method of the output channels of a multichannel LED driver is proposed in this paper. This LED driver comprises a front-end ac-dc boost power factor correction converter followed by symmetric half-bridge isolated nonresonant dc-dc converter and symmetric voltage-multiplier rectifier with purely capacitive output filters. By controlling the duty ratios of the secondary side switches, which are strategically placed at the output voltage-multiplier-based rectifiers, the average LED current and hence the brightness of individual channels are controlled. Moreover, a unique primary side peak current control is implemented to control the peak currents of LEDs during pulsewidth modulation dimming, which prevents electromigration-related fast aging of the LEDs. This driver also has the advantages of high power (>120 W) operation capabilities, and high efficiency (>94%) with primary side switches zero voltage switching turning ON and secondary side rectifier diodes zero current switching turning OFF. A detailed analysis and design procedure of the proposed converter is presented. To validate the analysis, an industry-standard 150 W prototype is developed, which is digitally controlled by a cost-effective non-DSP microcontroller. The experimental results are in perfect agreement with the claims. A comparison for universal ac input and isolated LED drivers with selective dimming is displayed.
机译：提出了一种新型的多通道LED驱动器输出通道的选择性调光方法。该LED驱动器包括一个前端AC-DC升压功率因数校正转换器，其后是对称半桥隔离非谐振DC-DC转换器和带有纯电容性输出滤波器的对称倍压整流器。通过控制次级侧开关的占空比，次级侧开关策略性地放置在基于输出倍压器的整流器上，可以控制平均LED电流，从而控制各个通道的亮度。此外，在脉冲宽度调制调光期间，实现了独特的一次侧峰值电流控制来控制LED的峰值电流，从而防止了与电迁移相关的LED快速老化。该驱动器还具有高功率（> 120 W）操作能力和高效率（> 94％）的优势，其中初级侧开关零电压开关导通，次级侧整流二极管零电流开关关断。提出了拟议的转换器的详细分析和设计程序。为了验证分析结果，开发了行业标准的150 W原型，该原型由具有成本效益的非DSP微控制器进行数字控制。实验结果与权利要求完全吻合。显示了通用交流输入和带选择性调光的隔离式LED驱动器的比较。

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