In this paper, current-mode boundary conduction mode (BCM) of a high-efficiency LED driver with high power factor, utilizing low-voltage film capacitors, is presented, and its theoretical design and considerations are discussed. The 1.5-stage driver consists of a forward-flyback and buck converter. Higher efficiency was reached using the reduced redundant power processing approach. Most of the processed energy is transferred to the output through flyback, while the rest removes the low harmonic ripple in the output current through the forward-buck path. An acceptable amount of odd harmonics is injected into the input current by using current-mode BCM control method, further reducing bus capacitance. To validate these principles, a laboratory prototype has been built and experimental results of a high-current 85 W (29.5 V/2.9 A) lamp with 50 Hz, 185–255 V power supply are provided. The results show that output current ripple is low, and the input current harmonics are within the standard regulations.

中文翻译：

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具有电流模式 BCM PFC 和低压薄膜电容器的大电流 1.5 级 LED 驱动器

本文介绍了采用低压薄膜电容器的高功率因数高效 LED 驱动器的电流模式边界传导模式 (BCM)，并讨论了其理论设计和考虑因素。1.5 级驱动器由一个正向反激和降压转换器组成。使用减少的冗余功率处理方法达到了更高的效率。大部分处理后的能量通过反激式传输到输出端，其余部分通过正向降压路径去除输出电流中的低谐波纹波。通过使用电流模式 BCM 控制方法，将可接受数量的奇次谐波注入输入电流，进一步降低总线电容。为了验证这些原理，我们构建了一个实验室原型，并获得了 50 Hz 的大电流 85 W (29.5 V/2.9 A) 灯的实验结果，提供 185–255 V 电源。结果表明，输出电流纹波低，输入电流谐波在标准规定范围内。