Patent ID: 8179688

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; a first wiring board and a second wiring board, which are disposed on one side of the heat sink; and a signal terminal, 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 heat sink is made of iron, the heat sink temporarily stores heat from the second electric 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 signal terminal is disposed on a side of the resin mold, the signal terminal is coupled with the first electric element or the second electric element via a bonding wire, and the signal terminal is detached from the heat sink.