| 摘要 |
PROBLEM TO BE SOLVED: To radiate heat of switching loss by conducting it effectively to a radiating fin, even if two semiconductor switching elements are connected in series, moreover these semiconductor switching elements are attached to the one heat radiating fin exposing those collector parts at the back. SOLUTION: The exposed collector part 32 of the one semiconductor switching element 29 is attached to the heat radiating fin 42 by applying and filling a heat conduction filler through spacers 33, 34, and 35. The exposed collector part 37 of the other semiconductor switching element 36, is attached directly to the same heat radiating fin 42 by applying and filling a heat conduction filler, without through the spacers. Then, the heat of the switching loss is effectively conducted to the heat radiating fin 42, and radiated.
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