Patent ID: 8159820
Filing Date: 2012-04-17
Classification: H01L,H02M,H05K

Abstract:
1. An electric power conversion system provided with a casing, with a front face thereof, for covering cooling fins for cooling power semiconductors, a main circuit board having a driver circuit for driving the power semiconductors, disposed on a side of the front face of the casing, opposite from the cooling fins, and a cover combined with the casing, for covering the main circuit board, said system comprising: an airflow hole provided at a part in the front face of the casing, on the lower side of the cooling fins, for causing air from the main circuit board to flow therethrough within the casing, and a cooling fan for causing air from the airflow hole to flow to the cooling fins; a smoothing capacitor provided on the downstream side of the airflow hole; and an air-intake provided on the lower side of the smoothing capacitor, wherein the cooling fan causes air flowing from the air-intake to the smoothing capacitor to further flow to the cooling fins.