Exploiting Integrated Planar Magnetics
Jan 1, 2005
By combining two or more magnetic elements
into a single structure, magnetic integration allows
more efficient use of a core's cross-sectional area
and reduces the need for core material....
Circuit Analysis Accounts For Magnetic Fields
Nov 1, 2004
Ohm's law and Kirchhoff's voltage law (KVL) provide powerful tools for conventional circuit analysis (mesh analysis), but if time-varying magnetic fields...
Power Packaging Spins New Automotive Capabilities
Nov 1, 2004
A power packaging technology from International Rectifier (IR) improves current handling capabilities and lowers cost versus existing packaging techniques....
Power Transformer Attenuates Harmonics
Oct 1, 2004
The mains of the world were constructed as a giant copper causeway to transport electricity from the generating station to our homes and factories. Today's...
Analysis of Closed-Loop DC-DC Converters
Oct 1, 2004
Engineering labs often have a network analyzer, but few of them include an injection transformer for closed-loop analysis of dc-dc converters. Agilent...
Estimating Temperature Rise of Transformers
Jul 1, 2004
Transformers for power applications often are limited in size by an acceptable temperature rise. An acceptable temperature rise of a transformer is usually...
Simple, Reliable EN-Compliant Power System
Jul 1, 2004
The recent amendment to EN61000-3-2 has restated the harmonic current limits required for compliance as applied to most professional and industrial equipment...
Inductor Current Rating for a Buck-Boost Converter
May 1, 2004
Buck-boost converters produce a regulated output voltage either less than or greater than the input voltage. When the input voltage is higher than the...
Magnetic Solutions: Solving Inrush at the Source
Apr 1, 2004
A simple approach based on original research attacks inrush currents at the source - the power transformer. The use of special core materials and transformer design/construction techniques overcomes the limitations of common inrush control solutions....
Tapped-Inductor Boost Converter Yields Dime-Size Supply
Apr 1, 2004
Designs evolve because someone thinks of a better way to do something or because the first great idea (and sometimes the second and third) just didn't...
Thermal Management of Planar Magnetics
Feb 1, 2004
Planar transformers and inductors for high-frequency converters differ radically from conventional magnetics in that they do not use magnet wire. Instead,...
Inductor Core Material: The Heart of an Inductor
Jan 1, 2004
Inductors are deceptively simple. However, a closer look reveals underlying complexity. How else can you explain the many types of core materials, types...
Designing Bead Inductor for Multiphase Systems
Dec 1, 2003
For converters to achieve the desired efficiency, the inductors must be designed precisely. Here, an overview of the ac fringing field and its effect on designing bead inductors is given....
DC-Bias Specifications for Gapped Ferrite Cores
Oct 1, 2003
The well-known problem of defining the minimum inductance value for a target roll-off and dc current is addressed in the frame of a hysteresis model....
