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A power converter enclosure, intended in particular to equip a rail vehicle traction system including power electronic modules comprising one or more power semiconductor components mounted on a substrate, includes a base including a bottom panel with double walls having an inside wall on the side to

A power converter enclosure, intended in particular to equip a rail vehicle traction system including power electronic modules comprising one or more power semiconductor components mounted on a substrate, includes a base including a bottom panel with double walls having an inside wall on the side toward the interior of the enclosure in contact with at least one substrate supporting a power component. The bottom panel is extended by at least two lateral panels with double walls whose outside walls are cooled by cooling fins. The two walls of the bottom panel delimit a hollow volume partly filled with a cooling liquid and containing a thermally conductive permeable material providing a thermal bridge between the two walls.

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1. A power converter enclosure, intended in particular to equip a rail vehicle traction system including power electronic modules comprising one or more power semiconductor components mounted on a substrate, which enclosure includes a base including a bottom panel with double walls having an inside

1. A power converter enclosure, intended in particular to equip a rail vehicle traction system including power electronic modules comprising one or more power semiconductor components mounted on a substrate, which enclosure includes a base including a bottom panel with double walls having an inside wall on the side toward the interior of said enclosure in contact with at least one substrate supporting a power component, said bottom panel being extended by at least two lateral panels with double walls whose outside walls are cooled by cooling fins, and in which enclosure said two walls of said bottom panel delimit a hollow volume partly filled with a cooling liquid and containing a thermally conductive permeable material providing a thermal bridge between said two walls. 2. The power converter enclosure claimed in claim 1, wherein said thermally conductive permeable material is a porous material such as copper foam injected into said hollow volume defined by said two walls. 3. The power converter enclosure claimed in claim 1, wherein said thermally conductive permeable material comprises a stack of copper or aluminum grids between said two walls. 4. The power converter enclosure claimed in claim 1, wherein said lateral panels have an accordion-shape outside wall defining said cooling fins. 5. The power converter enclosure claimed in claim 1, wherein said lateral panels have a plane outside wall to which said cooling fins are attached. 6. The power converter enclosure claimed in claim 1, wherein one or more passive components are in contact with said inside wall of said double-wall lateral panels. 7. The power converter enclosure claimed in claim 1, wherein a cover of complementary shape to said base closes said enclosure. 8. The power converter enclosure claimed in claim 1, wherein said bottom panel of said base has a plane outside wall. 9. The power converter enclosure claimed in claim 1, wherein said bottom panel of said base has an outside wall cooled by cooling fins. 10. The power converter enclosure claimed in claim 1, wherein said power components are IGBT.