一种具有高功率因数和电流平衡功能的无频闪单开关多串LED驱动器

A flicker-free single switch multi-string LED driver with high power factor and current balancing is proposed and analyzed. It combines a pre-stage boost PFC converter and multiple second-stage buck dc–dc converters by a single active switch and multiple dc-link capacitors. With the proposed circuit configuration of multiple dc-link capacitors, the output current of each LED string can be balanced...