| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit heat radiator for efficiently radiating with a simple composition without enlarging the size. SOLUTION: A second radiating plate 34 is held to a circuit board 27 with a screw. A high voltage unit 30 of the circuit board 27 is composed at an attachment position 35 of the second radiating plate 34, and an IGBT37 driven under control of a low voltage unit 31 is held with a screw. The circuit board 27 with the second radiating plate 34 thereon is mounted at the bottom plate 23 of the first radiating plate 22 almost in parallel. A connecting part 36 formed in a bent-up shape almost vertically at one edge of the attachment part 35 of the second radiating plate 34 is held with a screw at a side plate 24 formed in a bent-up shape almost vertically at one edge of a bottom plate 23. A rectification bridge diode 32 in the high voltage unit 30 of the circuit board 27 is held with a screw to the side plate 24. A slit 45 is provided between a position for mounting the connected part 36 on the side plate 24 and a position for mounting the rectification bridge diode 32 so that the lengthwise line of the slit 45 intersects the straight line connecting these two positions. Then, a temperature gradient between these positions grows, so the thermal influence doesn't affect mutually, and heat can be radiated efficiently. |
