Rectifier ringing and snubbers

Morgan Jones Look inside almost any piece of commercial equipment having a linear power supply and you will find small capacitors across the rectifier diodes. Those capacitors are there to prevent the combination of mains transformer leakage inductance and diode capacitance from ringing when the diode switches off. But would ringing really occur, and if snubbers do work, how well do they work? To answer these questions, Morgan Jones first investigates transformer leakage inductance, then focusses on semiconductor diode capacitance and finally comes up with a surprisingly simple and effective snubbing method .