Abuck-boost integrated high gain non-isolated half-bridge series resonant converter for solar PV/battery fed multiple load LEDlighting applications

Abstract

Solar photovoltaic (SPV) or battery fed multiple load LED lighting applications are gaining importance these days, which require independent voltage regu lation 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 clas sical 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 lowcost, compactsize,improvedefficiencyduetosoft-switching, simple con trol, independent dimming, and effective operation for multiple loads. Thus, the proposednon-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 22Wanddual-LEDloadsof22Wand43W.Thereisan excellent consensus between the simulation and the experimental outcomes.