Light liquid cooled power electronic unit

A light liquid cooled power electronic unit comprising:

• several electromagnetic components (10), each comprising a magnetic core (11), at least one electroconductive coil (12) wound around the magnetic core (11), and a bobbin (13) interposed between the at least one electroconductive coil (12) and the magnetic core (11);
• a cooling circuit (20) with a liquid inlet (24), a liquid outlet (25), and several intermediate cooling regions (23), each intermediate cooling region (23) being in close contact with one of said several electromagnetic components (10), allowing heat transmission by conduction between the electromagnetic components (10) and the intermediate cooling regions (23);
• a first wall (31) containing at least a first flat manifold (21) constitutive of a portion of the cooling circuit (20);
• wherein
• each intermediate cooling region (23) of the cooling circuit (20) is defined within the bobbin (13) of one electromagnetic component (10) of said several electromagnetic components (10);
• and
• the first flat manifold (21) includes first connection openings (41) oriented towards the electromagnetic components (10), and each intermediate cooling region (23) of the cooling circuit (20) is tightly connected to the first flat manifold (21) through the first connection openings (41) by a fitting perpendicular to a main surface of the first wall (31).