A partial power converter (PPC) in an electrical power system, comprising an input capacitor connected in parallel to a power source vpv and connected to a primary winding of a transformer, wherein the primary winding is connected in series to a M1 transistor of the MOSFET (Metal Oxide Semiconductor Field Effect Transistor) type, wherein two secondary windings Ns1 and Ns2—both with the same number of turns, are connected, each one, in series by means of a terminal, with diodes D1 and D2, respectively, and the diodes D1 and D2 are connected to the respective ends of a capacitor Cdc output; the other terminal of the secondary winding Ns1 of the transformer is connected to one of the terminals of the primary winding, whereas the other terminal of the secondary winding Ns2 is connected to one of the terminals of transistor M1, and wherein the output capacitor Cdc serves as a link to connect to a next stage.