一种新型基于二次型Buck变换器的交错并联LED驱动电源

A Novel Interleaved LED Driving Circuit Based on Quadratic Buck Converter

为了减小输出电流纹波,提出了一种基于二次型Buck变换器的交错并联LED驱动电源。主电路由一个二次型Buck变换器和一条新增支路构成,这条新增支路包括一个开关管、二极管、电感和电容,优化了原有的拓扑结构,实现了高功率因数和恒流输出。采用交错并联技术,有效减小了滤波电感和输出电流纹波,纹波大小仅为输出电流峰峰值的0.18%。最后通过实验样机详细验证了理论分析的正确性。

In order to reduce the output current ripple,a interleaved LED driving circuit based on quadratic buck converter is proposed.It combines the quadratic buck converter and a new branch including a switch,a diode,an inductor and a capacitor,optimizing the original driving circuit.It has the advantages of high PFC and constant current output.Using the Interleaved technology,Magnitude of the filter inductor and the ripple of the output current are reduced.The ripple size is only 0.18%of the peak-to-peak value of the output current.Finally,the experiment is established to verify the theoretical analysis.