LED Drive Circuit with Series Input Connected Converter Cells Operating in Continuous Conduction Mode

Qingcong Hu, R. Zane
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引用次数: 15

Abstract

This paper introduces an LED drive circuit implemented by series input connected converter cells with a common duty cycle control approach operating from a dc voltage bus. With this structure, low voltage high frequency ICs and low profile components can be applied in high voltage applications. Flexibility is provided for the cells to work under different voltage supply conditions by simply changing the number of series converters. With the converters operating in continuous conduction mode (CCM), the common duty cycle control approach enables automatic line voltage sharing and output current copying. The approach results in a control-to-output transfer function of the system that is close to that of a single converter for ease of feedback loop design. The modular approach also allows continued operation in the presence of open circuit LED failures. Design considerations and experimental results are presented for a 25 W 3-cell system with 9 Luxeon K2 high brightness LEDs, demonstrating line voltage sharing, output current copying and LED failure response.
LED驱动电路与串联输入连接的转换电池工作在连续导通模式
本文介绍了一种由串联输入连接的变换器单元实现的LED驱动电路,采用直流电压母线的通用占空比控制方法。通过这种结构,可以将低压高频ic和低轮廓元件应用于高压应用中。通过简单地改变串联转换器的数量,为电池提供了在不同电压供应条件下工作的灵活性。由于变换器工作在连续导通模式(CCM),通用占空比控制方法可以实现自动线路电压共享和输出电流复制。该方法使系统的控制-输出传递函数接近于单个变换器的传递函数,便于反馈回路的设计。模块化方法还允许在开路LED故障的情况下继续运行。介绍了采用9颗Luxeon K2高亮度LED的25 W 3单元系统的设计考虑和实验结果,演示了线路电压共享、输出电流复制和LED故障响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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