PowerPoints, Documents, & Articles

(PowerPoint). This article describes the effects of magnetic flux fringing and how it can affect turns ratio measurements. A case involving EI and EE cores is presented demonstrating that while EE cores also exhibit magnetic flux fringing the typical location of an EE core’s air gap makes error introduced by fringing less pronounced than an equivalent EI core and it’s gap.
(PowerPoint). This article describes the effects of the tolerance of an air gap on core permeability and thus inductance. A very small gap dictates a large tolerance on inductance as demonstrated here. A companion spreadsheet allows the reader to evaluate different scenarios with respect to air gaps, their tolerance and the resulting influence on inductance.
(PDF). While inductance is the most common parameter used to specify a common-mode choke other parameters such as core loss resistance and distributed capacitance play a critical part in CMC performance. See also the Common-mode Choke Impedance Calculations (Excel spreadsheet) providing a graphical display of both common-mode impedance and attenuation based on CMC parameter elements. By Dave LeVasseur, VP of Research & Development, Minntronix, Inc. 5/13/2015.
What you ‘set’ may not always be what you ‘get’ (PDF)
Setting the drive level on many inductance bridges doesn’t always guarantee that the level you set will be the same as what is applied to the part under test.
Most if not all core materials (except for “air”) exhibit changes in their permeability at different drive levels.
When tested near its saturation point the inductance of a winding may vary widely causing some bridges to provide erroneous readings or no reading at all.
By Dave LeVasseur, VP of Research & Development, Minntronix, Inc. 12/17/2014
Understanding safety-isolation rules and testing requirements enables you to address potential safety-isolation vulnerabilities.
By David Lohbeck, National Instruments, EDN, 9/30/2004
(PDF). From March/April, 2001 Compliance Engineering, by Homi Ahmadi
From EDN Design Ideas, March 17, 2005, by Jeff Fries
Power is often an afterthought in system design, but the choice and design of the magnetic elements at the heart of an SMPS are crucial. Acquaint or reacquaint yourself with the fundamentals of this frequently overlooked area. By Sameer Kelkar, Power Integrations — EDN, 11/26/2009
(PDF). Cost-Constrained Selection of Strand Diameter and Number in a Litz-Wire Transformer Winding From IEEE Transactions on Power Electronics
Vol. 14, No. 2, March 1999, Charles R. Sullivan, Member, IEEE
Greg Amorese, Agilent. Covers impedance, component value definitions, present typical measurement problems and their solutions along with error correction and compensation.
Understanding safety-isolation rules and testing requirements enables you to address potential safety-isolation vulnerabilities.
By David Lohbeck, National Instruments, EDN, 9/30/2004
(PDF). Agilent Application Note 346-4, a general guide to making useful and repeatable measurement of impedance.
Textbook on power electronics converters, by Robert W. Erickson, University of Colorado. This book is intended for use in introductory power electronics courses at the senior and first-year graduate level. It is also intended as a source for professionals working in power electronics, power conversion, and analog electronics. It emphasizes the fundamental concepts of power electronics, including averaged modeling of PWM converters and fundamentals of converter circuits and electronics, control systems, magnetics, low-harmonic rectifiers, and resonant converters. Designed for instructors, here are accompanying instructional materials for ”Fundamentals of Power Electronics”.
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