To provide a fixing device for a power semiconductor device, with which necessary insulating durability is assured, without using insulating spacer or the like, and breakdown of the semiconductor device due to a surge will not occur.
The fixing device comprises a heat-dissipating fin block 2, an insulating sheet 4 placed between the power semiconductor device 1 and the heat-dissipating fin block 2, and a fixing tool 3, which is formed of an insulating material and is fixed to the heat-dissipating-fin block 2 with a screw 5, to fix the power semiconductor device 1 to the heat-dissipating-fin block 2, wherein a wall part 3b positioned between the screw 5 and the power semiconductor device 1 is formed integrally in the fixing tool 3. Thereby, there is no concern necessary about the insulating distance or the like between the fixing tool 3 and the power semiconductor device 1. Also, even if a thunder surge is accidentally applied to the screw 5, the surge will be cut off by the wall part 3b, and the power semiconductor device 1 will not suffer a breakdown.
FUKUNISHI TAKAHIRO
NISHINOMIYA MASAFUMI
OKUI HIROSHI
Tomoyasu Sakaguchi
Hiroki Naito