Magnetics
Advanced Inductor Circuit Modeling - Part I
Advanced LTspice circuit models for a helical-foil inductor. Circuit simulation closely matches measured results.
Advanced Inductor Circuit Modeling - Part II
Advanced LTspice circuit models for a helical-foil inductor. Lab measurements of ac resistance capture gap loss and provide accurate results.
RidleyBox Performance Measurements
Compare the RidleyBox Performance for frequency response measurements
Magnetics and Dowell's Equations Chapters 1-4
This early report shows impressively detailed and complex application of Dowell's equations. Chapters 1-4 of the work.
Magnetics and Dowell's Equations Chapters 5-9
Only 1% of engineers will ever attempt to use this work - will you be one of them? For the other 99%, RidleyWorks does all the hard work for you.
[108] Custom Transformers – Leakage Inductance Considerations
One equation governs the saturation of a transformer, but the leakage inductance provides strong direction to a design.
[106] Custom Transformers – ONE Design Equation
As with inductors, the design of a transformer is governed by a single design equation. Obey this, and the path to creation of new designs is clear
[105] Designing Custom Inductors
Inductor manufacturers have made great progress in the families of standard parts. The selection of off-the-shelf parts in this category have increased dramatically in the past 10 years.
[103] Custom Inductors – Applying the ONE Design Equation
Dr. Ray Ridley continues his discussion on the ONE design equation.
[102] Custom Inductors – ONE Design Equation
Dr. Ray Ridley discusses his introduction into Power Electronics. An early foray into design optimization software revealed a curious fact about magnetics design - there is only ONE design equation that must be obeyed.
[101] Magnetics Design – Simple or Complex?
What do you need to build good magnetics? A PhD, or practical experience?
[100] Magnetics Design Part I - Standard or Custom?
Magnetics represent the most ancient of technologies used in modern electronics systems.
[099] Modern Magnetics Design
This article gives an example of how profound proximity effects can be.
[097] Linear Circuit Model for Predicting Magnetics Winding Proximity Losses
A linear circuit model is derived which will show complex proximity effect losses for arbitrary waveforms.
[A20] High Frequency Power Inductor Design
Proximity effects show the difference between off-the-shelf designs and custom designs.
[A19] Using Fractals to Model Eddy-Current Losses in Feretic Materials
Vorpérian’s fractal circuits accurately model the frequency dependence of core loss.
[A15] High Frequency Power Transformer Measurement & Modeling
Characterize your magnetics properly to guarantee quality parts.
[A06] Core Loss Modeling & Measurement
A core loss modeling paper from Chris Oliver of Micrometals.
[A03] Modeling Ferrite Core Losses
The Ridley-Nace model improves accuracy over wide range of core usage.
[091] Core Loss Modeling - Part III Sinewave Versus Triangle Wave Losses
Calculating the difference between sinewave and triangle wave excitation shows that sinewave measurements are sufficient for loss calculations.
