This letter presents a novel solution to attenuate the electromagnetic emission of power switching circuits due to the resonance of the loop parasitic inductances with the parasitic capacitances of the power devices. A resonant snubber based on the magnetic coupling of a power parasitic loop causing unwanted oscillations with another one inserted at the printed circuit board level purposely and loaded by a dissipative element, is presented. A design method is proposed and used to damp the unwanted oscillations affecting the switching voltage and current in a prototype, which was specifically designed and fabricated to validate the proposed solution. The conducted emission delivered by such a prototype equipped with the resonant snubber, with an RC snubber, and without any snubber are compared.

On the use of Magnetically Coupled Resonant Snubbers to Mitigate the Electromagnetic Emission of Power Switching Circuits / Fiori, F.. - In: IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY. - ISSN 0018-9375. - STAMPA. - 64:1(2022), pp. 259-262. [10.1109/TEMC.2021.3106769]

On the use of Magnetically Coupled Resonant Snubbers to Mitigate the Electromagnetic Emission of Power Switching Circuits

Fiori F.
2022

Abstract

This letter presents a novel solution to attenuate the electromagnetic emission of power switching circuits due to the resonance of the loop parasitic inductances with the parasitic capacitances of the power devices. A resonant snubber based on the magnetic coupling of a power parasitic loop causing unwanted oscillations with another one inserted at the printed circuit board level purposely and loaded by a dissipative element, is presented. A design method is proposed and used to damp the unwanted oscillations affecting the switching voltage and current in a prototype, which was specifically designed and fabricated to validate the proposed solution. The conducted emission delivered by such a prototype equipped with the resonant snubber, with an RC snubber, and without any snubber are compared.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2943652