| 摘要 |
In an alternator, a voltage control device includes a control circuit IC chip, a radiating fin and a case. The radiating fin 253 has a base 256 that is fixed to the IC chip and radiating portions. The radiating portions protrudes from the base 256 and have substantially U-shaped cross sections, so that tubular air passages are formed between the radiating portions and a fixed surface of the IC chip. Each radiating portion has a central trunk and alternating branches, thereby rows of air passages are formed by the central trunk and rows of branches.
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