A device for providing electric power to a load, having two switch members (Z1, Z2) connected in series between positive and negative power supply rails. The first switch connected to the positive rail and the second switch connected to the negative rail, with an inductor (L) being connected to a bridge point between the switches and the load. Each switch having and a flywheel diode connected in parallel with a switchable member. A monitoring circuit monitors a current (I) through said inductor (L) and a bridge voltage (E) at said bridge point. A control circuit provides control signals to the switches for turning said switchable members ON and OFF. When said current is positive, the control circuit turns the first switch member OFF when said current exceeds a predetermined control value (I0) whereupon the current decreases towards zero and passes through the flywheel diode of the second switch member.