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resonant filtering

Kevin Weddle

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Traditionally most low to medium power high frequency power supplies (<1kW) are not resonant and use PWM to adjust the amount of power i.e. regulate the output current or voltage.

More modern and higher powered SMPes, typically are resonant. The employ a technique known is zero voltage switching where the transistors are only turned on when the voltage across them is zero. Here's a link with more information.


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If you're talking about EMC filtering then no, resonant filtering is no beneficial, it's harmful because tuned circuits can be excited leading amplification of certain frequencies.

Resonant filtering is only used for tuning a circuit to a particular frequency, for example in a tuned radio receiver a capacitor is placed in parallel with an inductor to form a tuned circuit.

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