Patent ID: 7535076

Claim:
A power semiconductor device comprising a switching power semiconductor element, and a free wheeling diode in anti-parallel connection to the switching power semiconductor element, characterized in that: a reverse electrode of the switching power semiconductor element and a reverse electrode of the free wheeling diode are bonded and mounted on a circuit pattern formed on a main surface of the first substrate; a circuit pattern, which is so formed on a main surface of the second substrate as to oppose a surface electrode of the switching power semiconductor element and a surface electrode of the free wheeling diode, is connected to the surface electrodes of the switching power semiconductor element and the free wheeling diode through connective conductors to be soldered, respectively, at least the contacting surfaces of the connective conductors each having a curved surface which directly contacts the circuit pattern or the surface electrode; a first string-like partitioning material is a U-shaped partitioning material laid in the vicinity of and alongside the outer peripheral edges of the first substrate and the second substrate, and is bonded to the first substrate and the second substrate; a gel-like insulation and heat resistant filler is inserted from an opening of said U-shaped partitioning material or is inserted using a syringe from the bases of the three sides of said U-shaped partitioning material; and a second partitioning material is disposed on said opening and is bonded to the first substrate and the second substrate to thereby seal and confine the insulation and heat resistant filler.