Design of the Traditional Snubber

The traditional snubber has been the approaeh used to keep bipolar power transistors away from seeond breakdown eonditions. It is also useful in the redue-tion of radiated EMI by eontrolling the dv/dt of reetifiers with abrupt reverse 

Waveshaping Techniques to Improve Power Supply Efficiency 

The empirical design process of the traditional snubber is as follows  

Measure the period of the ringing that is exhibited on the unsnubbed signal (I/fo). 

Place a high-frequency capacitor (ceramic or film) across the primary winding of the transformer, rectifier, or the element to be snubbed. Determine the capacitor value that produces an oscillation period which is three times the original period (Co). 

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