Abstract: A switch mode power supply comprises at least one bridge arm including two switching cells in series receiving a direct current voltage to be switched. Each switching cell includes a switching arrangement in parallel with a capacitor and a protection diode. The switching arrangement is alternately closed and opened to supply an alternating current voltage at a switching frequency applied to a load one terminal of which is connected to the common point of the switching cells. A pulsed current source including a saturable inductor is connected to the common point. The saturable inductor is provided by a device including a primary circuit with two windings and a secondary circuit including a single winding to which a direct current source is connected. The windings are wound on a magnetic core and the windings of the primary circuit are connected in parallel and wound in opposite directions. A capacitor is connected in series with the saturable inductor.

Abstract: A chopper power supply of the invention includes a bridge arm constituted by two switching sections in series and receiving a DC voltage. Each switching section includes switching means in parallel with a capacitor, the switching means being controlled so as to supply an AC voltage to a load. A pulse current source is connected to the load, the pulse current source being constituted by an LC-type circuit dimensioned so that the current flowing through the circuit is delayed by .pi./2 relative to the voltage applied to the load so as to deliver current pulses for alternately charging and discharging each of the capacitors on the edges of the AC voltage.