| 摘要 |
PURPOSE:To enhance the cooling performance by providing a heat sink at heat emitting parts in a control circuit, and furnishing a frame leading from the heat sink to the exhaust hole of a cooling fan. CONSTITUTION:A duct 9 constitutes a frame leading from a heat sink 5 to the exhaust hole 3 of a cooling fan 1. A switching element 6 is mounted at the heat sink 5, and the fan 1 inhales the air as shown by arrow (e) and blows it as arrow (f), and the heat sink 5 is cooled by the wind. As the section between the exhaust hole 3 of the fan 1 and the heat sink 5 is surrounded by the duct 9, the cooling wind sent from the fan 1 can mostly be used for cooling the heat sink 5. Thereby the cooling performance is enhanced. |
