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5 months ago in Power Electronics By Kirti

How does switching frequency affect noise in power converters?

I'm choosing a switching frequency for a new converter. How does this choice affect the noise I'll have to deal with?

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By Suresh Answered 1 month ago

In multiple ways. Higher f_sw pushes conducted EMI fundamentals higher, sometimes easing filter design—but increases radiated emissions due to sharper edges (dV/dt, di/dt). For audible noise (coil whine), switching above 20 kHz moves harmonics out of human hearing range, a common trick. But higher frequencies also mean higher-frequency magnetic vibrations. There's no free lunch: you trade one noise type for another. Know your application's noise limits before choosing.

 

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