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Welcome to this installment of EE Classroom on Transformers.

Electronics may not be simple but there are devices that are simple – and simply elegant – but which still require an understanding of the challenges they can present when integrating into a design. Transformers are such a device; a device that is “simply” a pair of inductors magnetically coupled to enable electromagnetic induction between them. From electromagnetic induction to the coefficient of coupling to the turn, voltage, and current ratio, there are plenty of points to consider when working with transformers.

In this classroom, you’ll learn some of the dos and don’ts while working with transformers, as well as types, applications, and design considerations. Get to know the material properties and geometric of magnetic cores used in power inductors. Learn when Electromotive force (EMF) can become Electromagnetic Interference (EMI) when induced current happens where it’s not wanted. Lower voltage circuity may be the trend but what if your design takes you down the high-voltages path? The two-part FAQ on voltage boosters and voltage multipliers can help you set your course. What about the flyback power converter topology? The basics of this 70+ approach hasn’t changed (much) but you can refresh your knowledge and learn more about how enhancements and ICs fit into flyback design. And don’t forget to check out the more detailed guides to transformers from our sponsor.

Aimee Kalnoskas

Editor in Chief, EE World Online

Flybacks  •  High Voltage

Flyback power converters: Basic principles

Higher voltages: Voltage boosters

Higher voltages: Voltage multipliers

Flyback power converters: Enhancements and ICs

Some techniques for a modest amount of boosting of lower voltages, as well as for increasing a voltage.

The flyback design offers some distinct advantages along with unique idiosyncrasies.

What are called voltage “multipliers” usually give push voltages to much-higher values than multipliers.

A look at some at some of the advanced points for flyback designs.

Magnetics  •  Buck Converters  •  EMI

Comparing magnetic cores 

Synchronous buck regulators and overcurrent protection

Mutual inductance & transformers: When EMF becomes EMI

Know how the material properties and geometries of magnetic cores affect the ability of inductors to store energy or filter current.

A review of several popular OCP schemes, how these schemes work, and how to implement them in buck regulators

Learn how mutual inductance is superbly demonstrated in a transformer.

Transformer Basics

Types of transformers

Types of transformers by use

Practical guide to transformers

A discussion of the classification of transformer by core material, geometry, and voltage levels. 

A transformer is an electrical and electronic device where magnetic coupling between inductors is utilized.

Exploration of two broad categories of transformer use cases – electrical domain and electronics domain.

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