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Method to Suppress the Parasitic Resonance in Switching Circuits Using Parallel Resistor and Inductor Combination
University of Missouri System: Missouri University of Science and Technology
posted on 09/14/2009
A method to suppress the voltage ringing due to the parasitic resonance
Suggested Uses
• Voltage ringing suppression in computers and portable electronics
Advantages
• Simple circuit
• Predictability
• Low impact on efficiency
• Superior suppression of phase voltage ringing
• Small-sized resistor
• Possibility of implementing the inductor on the PCB trace
• Reduction of the radiated broadband noise due to the phase voltage ringing
Detailed Description
Switched power supplies, like Buck converters, often cause ringing voltages and currents, and fast switching events will excite parasitic resonant structures. This ringing often causes electromagnetic interference (EMI) problems. The method described involves the addition of two small, passive components to achieve suppression with hardly any effect of the efficiency of the converter. A proper implementation of this method can result in significant suppression of ringing in the switching voltage waveform as well as suppression of radiated EMI.
File Number: 09MST014
Web site: http://ecodevo.mst.edu
Other Information:
Case Manager: Keith Strassner (kdstrass@mst.edu)
This innovation currently is not available for online licensing. Please contact Keith Strassner at University of Missouri System: Missouri University of Science and Technology for more information.
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