Patent ID: 7843700

Claim:
An electric device comprising: a first electric element; a second electric element capable of flowing large current therethrough so that heat is generated in the second electric element; a heat sink; and a first wiring board and a second wiring board, which are disposed on one side of the heat sink, wherein the large current in the second electric element is larger than that in the first electric element, the first wiring board and the second wiring board are separated from each other, the first electric element is disposed on the first wiring board, the second electric element is disposed on the second wiring board, the first wiring board and the second wiring board are made of ceramics, and the heat sink is made of iron, the heat sink stores temporary heat from the second element thereby preventing heat transfer to the first electric element, the first electric element, the second electric element, the first wiring board, the second wiring board, and the heat sink are molded with a resin mold, the heat sink includes another side, which is opposite to the one side of the heat sink, the other side of the heat sink is exposed from the resin mold, the heat sink further includes a side having a protrusion, and the protrusion is embedded into the resin mold.