基于Boost拓扑PFC两级LED驱动电源的设计

Design of PFC Two-Stage LED Power Supply Based on Boost Topology

文中提出了一种基于Boost拓扑PFC两级LED恒流驱动方案,通过对输入电压采样并应用乘法控制策略规划电感电流,使电感的电流峰值包络与输入电压保持一致,达到了功率因数校正的目的,给出了一种双三极管结构构建的低压差线性恒流结构。该结构具有工作电压低、功耗低的优点。

In this paper,a constant current supply scheme of PFC based on Boost topology is proposed.The current peak envelope of the inductor is consistent with the input voltage by sampling the input voltage and applying the multiplication control strategy to achieve the power factor correction.A low dropout linear constant current structure constructed by a double transistor structure is proposed.The structure has the advantages of low operating voltage and low power consumption.