Patent ID: 7557434

Claim:
A power electronic package comprising: first and second high thermal conductivity insulating non-planar substrates; and a plurality of electronic components mounted on each of the first and second high thermal conductivity insulating non-planar substrates, wherein the first and second high thermal conductivity insulating non-planar substrates are coupled to each other at a plurality of bonding regions so that mechanical separation between the first and second high thermal conductivity insulating non-planar substrates is controlled by the number of the bonding regions, an arrangement of the bonding regions, a shape of each bonding region, and a material of the bonding regions, the mechanical separation provides a net axially-directed compressive force in the electronic components, the bonding regions include electrically inactive bonding regions, the mechanical separation of the first and second high thermal conductivity insulating non-planar substrates is controlled by the number of the electrically inactive bonding regions, an arrangement of the electrically inactive bonding regions, and a shape of each inactive bonding region, the plurality of electronic components is sandwiched between the first and second high thermal conductivity insulating non-planar substrates so that the net axially-directed compressive force is applied to each electronic component, each of the first and second high thermal conductivity insulating non-planar substrates includes a metal layer, which is disposed on the high thermal conductivity insulating non-planar substrate and opposite to the plurality of electronic components, the metal layer is made of a material that is the same as a material of the electrically inactive bonding regions, each of the bonding regions has the same height from the high thermal conductivity insulating non-planar substrate, the number of the electrically inactive bonding regions is equal to or larger than four, the electrically inactive bonding regions are arranged symmetrically with respect to a center of the high thermal conductivity insulating non-planar substrate, and each of the electrically inactive bonding regions has a planar shape of a square with a rounded corner, the radius of which is equal to or larger than 0.6 mm, or a planar shape of a circle, the radius of which is equal to or greater than 0.6 mm.