A Single-Stage LED Driver Based on Half-Bridge $CLCL$ Resonant Converter and Buck–Boost Circuit

A single-stage light-emitting diode driver based on interleaving buck-boost circuit and CLCL resonant circuit is proposed in this paper. The two circuits achieved an effective integration as well as kept their respective working conditions through the switch integration. Interleaving buck-boost circuit with symmetrical structure worked in discontinuous-conduction mode, achieving high power factor and low harmonic distortion. This structure can reduce the input current ripple and balance the current stress of switch at the same time. Besides, the bus voltage was also reduced. The CLCL resonant circuit has a soft-switching characteristic, the primary side operates in zero voltage mode and the secondary side operates in zero current mode. In addition, due to the small turn-OFF current, the turn-off loss of switch was also reduced. Therefore, the system efficiency was high. This paper elaborated the working mode, analysis and design method of the proposed topology. Finally, a 100-W experimental prototype was built, and the experimental results were corresponded with the theoretical analysis.