Patent ID: 8384246

Claim:
A unidirectional converter device for supplying a DC output voltage on an output line, said device including at least one switching unit comprising: a power supply input to which an input voltage is applied, rectifier means connected to said power supply input for supplying the output voltage, switching means connected to said power supply input for a main turn-on or turn-off of an input current so that, when main turn-off occurs, an input current is diverted to said rectifier means, control means for said switching means, a switching aid circuit connected between the power supply input and the output line for establishing a switching voltage equal to zero before main turn-on, said switching aid circuit comprising inductive means and branch-off means branching off of the input current to said inductive means before main turn-on, and power storage means parallel-connected on the switching means for establishing a resonance of said current in the inductive means before main turn-on, wherein said inductive means comprise a transformer directly connected to the power supply input, and comprising at least one first winding, at least one second winding reverse-coiled with respect to the first winding, and the branch-off means comprise auxiliary switching means directly connected either between said inductive means and a voltage reference or between said inductive means and the output line.