A buck-boost integrated high gain non-isolated half-bridge series resonant converter for solar PV/battery fed multiple load LED lighting applications

Solar photovoltaic (SPV) or battery fed multiple load LED lighting applications are gaining importance these days, which require independent voltage regulation and dimming control. Half-bridge resonant converters are mostly used due to their simple structure. In this paper, a buck-boost integrated high gain non-isolated symmetrical half-bridge series resonant converter is proposed for multiple load LED lighting applications. With the aid of integrated buck-boost operation, the output voltage can be regulated below and above the nominal input voltage effectively and can produce twice the gain as compared with classical half-bridge converters. Frequency modulation is implemented for output voltage regulation. Pulse width modulation (PWM) dimming has been adopted for illumination control. The proposed driver results in several advantages such as low cost, compact size, improved efficiency due to soft-switching, simple control, independent dimming, and effective operation for multiple loads. Thus, the proposed non-isolated driver configuration is well suited for SPV/battery fed multiple load LED lighting applications. The proposed configuration is tested with single LED load of 22 W and dual-LED loads of 22 W and 43 W. There is an excellent consensus between the simulation and the experimental outcomes.