| 摘要 |
PURPOSE: The noise reduction device of switching mode power supply is provided to cut the source of noise by flowing the induced voltage of a switching transistor out of the earth with connecting heat sinks of the switching transistor to earth terminal. CONSTITUTION: The noise reduction device of the switching mode power supply includes the switching transistor(5) formed between the heat sinks(10). The heat sinks(10) is connected with the earth terminal(20) to reduce radiation noise and conductivity noise of the switching transistor(5).
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