He frequently presents seminars on EMC/ESD topics and microphone design.This application note describes the diode selection process and snubber design for high voltage inverting flyback converter for subscriber-line interface card (SLIC) applications. Patents for automotive microphone, digital communications, and switch-mode-power-supply designs. Bill’s name has been listed in a dozen U.S. Previously, Bill was a Senior Microphone Design Engineer at Electro-Voice, Inc., where he worked for twenty-four years. He can be reached at Spence is a Senior Electromagnetic-Compliance Engineer and has been working in Gentex Corporation’s Electro-Magnetic-Engineering Lab for the last fifteen years. Adamczyk is the author of the textbook “Foundations of Electromagnetic Compatibility with Practical Applications” (Wiley, 2017). He is an iNARTE certified EMC Master Design Engineer, a founding member and the chair of the IEEE EMC West Michigan Chapter. Bogdan Adamczyk is a professor and the director of the EMC Center at Grand Valley State University () where he performs research and develops EMC educational material. Bogdan Adamczyk, Foundations of Electromagnetic Compatibility with Practical Applications, Wiley, 2017.ĭr.Bill Spence, “Snubber Design: Reducing SMPS EMI,” Lunch and Learn, Gentex Corp, 2014.Bogdan Adamczyk, “Circuit Theory Model of Ringing on a Transmission Line,” In Compliance Magazine, November 2018.Henry Ott, Foundations of Electromagnetic Compatibility Engineering, Wiley, 2009.The magnetic energy stored in the inductor is dissipated in the arc across the switch contacts or is radiated, as shown in Figure 1(b).įigure 15: Comparison of the circuit responses: FFT of the waveforms with and without snubber When the switch opens, a large negative voltage develops across the inductor and subsequently the switch. The energy stored in the magnetic field of the inductor is When the switch is closed, in steady-state the voltage across the inductor, v L, is zero, and a dc current I 0 flows through the inductor. Switching in an Unprotected Inductive CircuitĬonsider the circuit shown in Figure 1(a). Part II (to appear in the March 2019 issue of In Compliance) will address the systematic process of the snubber circuit design, together with the simulation and verification through the laboratory measurements. The impact of an RC snubber on the circuit performance is demonstrated through a series of simulations. In Part I we discuss the fundamentals of the inductive switching and the need for circuit protection. T his is the first of the two articles devoted to the topic of an RC snubber design. JanuPart I: Fundamentals of Inductive Switching and RC Snubber Impact
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