| 摘要 |
<p>An airflow-direction unit (30) is provided with air-intake openings (32) communicating with the interior space of a housing (2B) on the side facing a semiconductor power module (11), and discharge openings (33) communicating with the interior space of the housing on the side facing a first mounting substrate (23) farthest separated from the semiconductor power module, and the airflow-direction unit (30) is configured so as to generate a natural convection current of air from the semiconductor power module side toward the first mounting substrate side such that air from the housing interior is taken in through the air-intake opening, and air from the interior of the airflow-direction unit is discharged to the housing from the discharge opening.</p> |
