Supply circuit for power module with built-in isolation transformer and associated power module

A power module comprising electrical power components, a circuit for controlling the power module, an electrical power supply circuit, and a first power module substrate and a second power module substrate each having a first side including a first heat sink and a second side opposite to the first, the second sides of the first and second power module substrates being disposed facing each other, and the electrical power supply circuit, the control circuit, and the electrical power components being disposed between the first and second power module substrates, a first substrate of the electrical power supply circuit being formed by a part of the first power module substrate and a second substrate of the electrical power supply circuit being formed by a part of the second power module substrate, the electrical power supply circuit comprising an electrical transformer including a primary circuit and a secondary circuit,

• wherein the electrical power supply circuit comprises:
• the first substrate having a first side including the first heat sink and a second side opposite to the first side,
• the second substrate having a first side including a second heat sink and a second side opposite to the first side, wherein the second side of the second substrate faces the second side of the first substrate,
• first metal tracks disposed on the second side of the first substrate, and second metal tracks disposed on the second side of the second substrate, and
• electrical connectors disposed between the second side of the first substrate and the second side of the second substrate, the electrical connectors electrically connecting the first metal tracks to the second metal tracks,
• wherein the primary circuit of the electrical transformer is electrically connected to a first part of the first metal tracks and a first part of the second metal tracks, and the secondary circuit of the electrical transformer is electrically connected to a second part of the first metal tracks and a second part of the second metal tracks, wherein the electrical power supply circuit includes an electrical isolator made of polymer material in which electrical elements disposed between the first and second substrates are encapsulated.