The invention relates to an electronic power converter apparatus (100; 100). The apparatus comprises a box-like body (10; 10') comprising a first base wall (1) and an opposite second base wall (2) joined to each other by a first (3) and a second (4) side wall and by a bottom wall (5) orthogonal to the base walls; the first and second side walls and the bottom wall extend orthogonally from the base walls along a main longitudinal extension direction (L) of the box-like body to delimit a housing compartment (6) accessible from the outside through an insertion opening (7) opposite to the bottom wall.
The apparatus comprises a first (20) and at least a second (30) converter module accommodated in the housing compartment so that the first converter module is proximal to the first base wall and the at least a second converter module is superimposed on the first converter module along the main longitudinal extension direction of the box-like body. The first and the at least a second converter module comprise a first and at least a second electronic circuitry, respectively, adapted to dissipate electrical energy by generating heat inside the box-like body.
The apparatus comprises a forced-ventilation cooling unit, which comprises a first (21) and at least a second (31) heat dissipation device associated with the first and at least second converter modules, respectively. Such first and at least second heat dissipation devices are configured to convey a cooling air flow (F1, F2) entering into the interior of the box-like body and to convey a corresponding heated air flow (Fout) exiting from the box-like body, to cool the first and at least second converter modules by removing the heat generated by the first and at least second electronic circuitry. The apparatus is characterized in that: the first heat dissipation device is housed in the first converter module to be interposed between the first side wall of the box-like body and a median plane (P) of the box-like body parallel to and equally spaced apart from the first and second side walls;
the at least a second heat dissipation device is housed in the at least a second converter module to be interposed between the second side wall of the box-like body and the median plane.