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This paper describes the design and implementation of a boost connected in cascade with a quadratic buck converter, with just one active switch, used to drive a LED string for public and private lighting purposes. The proposed converter supports a wide input voltage range that makes it possible to be supplied from 12 VDC to 340 VDC (240 VAC), without any additional adjustment. It can be used in hybrid electrical systems supplied by photovoltaic systems or 110/220 VAC from the utility power grid. Experimental results from an 11 W prototype are also presented.