Advanced Inductor Circuit Modeling

Advanced LTspice circuit models for a helical-foil inductor. Circuit simulation closely matches measured 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.

[090] Core Loss Modeling - Part II Incorporating Duty Cycle Effects

Improved formulas for magnetics core loss with duty cycle effects.

[089] Core Loss Modeling - Part I Ridley-Nace Equation

Improved formulas for calculating magnetics core loss.

[087] Real World Magnetics Design Issues

Many things can go wrong in the design and production of power supply magnetics.

[086] Optimizing Foil Windings for Power Supply Magnetics

Choosing the right foil thickness affects total winding dissipation.

[085] Low-Profile Inductors with Helical Foil Windings

Inductors made with helical foil windings.

[076] Power Supply Failure Survey – Part III Magnetics

Survey results on the causes of power supply failures due to magnetics.

[053] Flyback Transformer Primary Winding Structures

How to wind a flyback primary for the best possible performance.

[049] Forward Converter Design - Part XV Cross-Regulation

Cross-regulation characteristics of the five-output forward converter.

[048] Forward Converter Design - Part XIV Magnetics Design for Five Outputs

Designing custom magnetics for three- and five-output forward converters.

[047] Forward Converter Design - Part XIII Current Transformer Design

Desiging current transformers for fast sensing on the forward converter.

[046] Transformer Impedance Measurements

Making essential measurements on high frequency power transformers.

[031] Choosing the Inductor for a Buck Converter

How to select the size of the inductor for a buck converter.

[005] High Frequency Power Inductor Design

Proximity Loss in Magnetics Windings

[004] HF Transformer Measurement and Modeling

How to measure and model high-frequency magnetics for switching power supplies. Essential steps for both custom-designed parts, or purchased components.

Magnetics