HOW2POWER TODAY brings you in-depth reporting on the latest design techniques for power conversion, new components, and the employment outlook for power electronics engineers.
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» The Small-Signal Model of An Active-Clamp Forward Converter (Part 1): Basics of The Forward Converter And Its Transfer Function
» Video: Inside the 21st Century Power Test Lab
» Control Circuit Simplifies PFC Boost Converter Design
» USB Charger Provides Battery Backup And Load Switching With Easy, Low-Cost Design
» Focus On Magnetics:
Understanding Tradeoffs In Core Geometry Aids Transductor Design
» Book Review:
Text Reveals Circuit And System Knowledge For Designing Grid-Connected Converters In Renewable Energy Systems
» New Power Products
» Other Top Power News
» From the Editor's Desk
Even advocates of simulation will point out that it's not sufficient to fully characterize a power converter design and that mathematical analysis and testing of prototypes are needed to provide the missing details. These themes are touched on as Christophe Basso begins an article series in which he will explain how to build a small-signal model of the active-clamp forward converter and derive its transfer function. Here In part 1, he acknowledges that engineers can derive the small-signal response of a converter using simulation, but that won't tell designers about the effects of parasitic elements on the poles and zeros of the power stage, leaving designs vulnerable to the production spread in various parameters. As Basso observes, "Only a complete transfer function analytically derived can tell you where [the design vulnerabilities] are and how you can counteract them." Similarly, previous features have stressed the need for more and better measurements. In support of that goal Steve Sandler now takes you on a video tour of his "21st Century Power Test Lab" where he discusses a variety of advanced instruments for measuring power supply waveforms and troubleshooting power-related problems. This issue also brings you Dennis Feucht's article explaining tradeoffs in core geometry that influence the design of transformers and coupled inductors, his review of a text on grid-connected converters, Tom Ribarich's article on a PFC boost converter design, Budge Ing's USB charger circuit for battery backup and load switching, and more.