Analysis and implementation of an integrated sepic-forward converter for photovoltaic-based light emitting diode lighting

This study presents an integrated sepic-forward converter for photovoltaic (PV)-based light emitting diode (LED) lighting system. In the proposed converter, the sepic converter is used to deliver the solar energy via PV cell modules to battery bank in charging mode during the daytime. During the nighttime, the soft switching forward converter is adopted to drive LED lighting system in discharging mode. Power switches of sepic and soft switching forward converters are integrated to reduce the component count and the synchronous switch technique is used in the circuit to reduce the conduction losses. Thus, the smaller size, lighter weight and higher efficiency can be achieved in the proposed converter. Finally, experimental results, taken from a laboratory prototype rated at 100 W, are presented to verify the effectiveness of the proposed converter.