Abstract: The invention comprises a circuit arrangement with a first direct voltage to an alternating voltage transforming unit, an alternating voltage to a second direct voltage transforming unit, and a second direct voltage smoothing filter, connectable to a load, whereby the first direct voltage to an alternating voltage transforming unit has an inductance whose one connection is connected to a mutual connecting point for a two series connected rectifiers, and wherein the alternating voltage to a second direct voltage transforming unit includes a parallel related rectifier. A back current through one of two parallel related rectifiers, formed at the switching period of the alternating voltage, and a therefrom originating power contribution to the inductance, is redistributed by a power contribution redistributing organ, belonging to the transforming unit, in order to reduce the losses appearing, for instance in the series connected rectifiers.

Abstract: A hacker type D.C. converter circuit having protective circuit features. The converter circuit includes a supply voltage source, and a series circuit including a first coil, a first diode and a first capacitor. The series circuit is connected to the supply voltage source. In addition, there is included a controllable switching arrangement, a connection junction between the first coil and first diode, and a further diode coupling across the switching arrangement. The first capacitor includes a first terminal remote from said further diode and a second terminal proximate the further diode. The connection junction is connected to the first terminal of the first capacitor remote from the further diode across the controllable switching arrangement which periodically alternates between open and closed states. The series between the connection junction and the first diode further includes an inductor and a second coil which is inductively connected to the first coil.