| 摘要 |
PURPOSE: To obtain an inverter device which circulates generated heat radiated inside a case and distributes a temperature uniformly by a method wherein a cooling fin is installed at the rear in the deep bottom part of the case, an open-air cooling fan is installed at the rear in the shallow bottom part of the case and an inside-air cooling fan is installed at the end part of a printed-wiring board for a main circuit. CONSTITUTION: When an inside-air cooling fan 12 and an open-air cooling fan 3 are driven, the inside air inside a case 1 passes through a space between a printed-wiring board 5 for a main circuit and the deep bottom part 1a of a case from an evacuation port 14 so as to deprive heat generated from a semiconductor element 11; it flows through an inclination part 1c; it hits a sidewall 1d; the heat of the inside air is given to, and received by, the sidewall; the cool air from the cooling fan 3 passes through the outside of the inclination part 1c; it is circulated between cooling fins 2 at the rear of the deep bottom part 1a; and the case 1 is cooled. The inside air which has hit the sidewall is circulated in a space between the printed-wiring board 5 for the main circuit and an electromagnetic shield plate 7 to enter the inside-air cooling fan 12 from an intake port 13. In this manner, the inside air is circulated, and the heat inside the case 1 is dispersed uniformly. |
