1. An electronic power system comprising:a first electronic module and a second electronic module, the first and the second electronic modules each comprising a first heat-conducting substrate, a second electrically conductive substrate, an electronic device arranged between the two substrates, at least one thermal bridge designed to transfer heat between the first substrate and the second substrate, the at least one thermal bridge being separate from the two substrates; and
a third substrate thermally; said third substrate being in the form of a plate sandwiched between the first and second electronic modules and being electrically coupled to:
the second substrate of the first electronic module; and
the second substrate of the second electronic module.