Resonant two-string LED driver with power factor correction and passive current sharing

A resonant two-string LED driver with power factor correction and passive current sharing is proposed. By controlling one output current, the other output current of the two-string LED driver can be controlled via passive current sharing, which makes its control simple. The proposed converter uses only one active switch and one magnetic component with single-stage power conversion, thus it benefits from low cost, small volume, light weight and high efficiency. The proposed converter is studied and experimental results of a 75 W two-string LED driver are provided to verify the studied results.