What Is a Toroidal Power Transformer?

Posted by Bill Dull | January 19, 2024 0 Comments

Transformers are devices used to transfer power between two parts of an electrical circuit, creating isolation while varying current and voltage. Transformers serve as integral components in most electrical systems.

Power transformers, in particular, are used when high-efficiency power transfer is needed. Depending on the specific application, devices may operate continuously or non-continuously at full load capacity. Like all transformers, power transformers are based on the principle of electromagnetic induction. Two magnetically coupled coils form the primary and secondary windings.

Toroidal Power Transformers

power-supply-precision-toroidal-transformerToroidal transformers are power transformers with a toroidal core on which the primary and secondary coils are wound. When a current flows through the primary, it induces an electromotive force (EMF) and then a current in the secondary winding, thereby transferring power from the primary coil to the secondary coil.

The unique shape of the toroidal transformer allows for shorter coils, reducing resistive losses or winding losses and improving overall efficiency.

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Advantages and Applications of Toroidal Power Transformers

Toroidal transformers can be much more compact than conventional power transformers of the same ratings. Plus, the improved efficiency can translate to lower temperatures.

Toroidal cores allow for 100% of the core to be used and wound upon, whereas other core shapes always have sections that need to reach around the windings to create the return magnetic path.  These sections always add weight and losses that are not needed with toroidal cores.

Stray magnetic fields are created by the ends of coils, where not all magnetic field lines couple to the core.  Well-constructed toroids have no end to their windings, meaning that there is no physical gap between the start and finish of the winding to allow outwardly radiated stray fields. They also have a high resistance to any external magnetic fields imposed upon them.

The compact size of toroidal transformers makes them ideally suited for applications in electronic circuits, so these transformers are often found in computers, inverters, and a multitude of similar devices. Toroidal models also hum less than conventional options, making them ideal for amplifier, television, and audio-system applications. 

Toroidal power transformers are particularly well-suited for critical equipment and devices in the medical industry, as superior efficiency is important in medical systems requiring low leakage currents, noiseless and reliable operation. Since these transformers are lightweight and compact, they can be easily integrated into medical instruments in which space constraints and weight limitations are key design considerations. 

Learn More

Triad Magnetics is a leading manufacturer of standard and custom toroidal power transformers, and we’re proud to offer over 45 different models to suit clients’ specific application needs. Our medical power transformers are equipped with dual windings to allow for series and parallel connections, depending on system needs.

Since these transformers are often used in space-constrained systems with other sensitive electronic components, the temperature rise is designed to remain between 25 ºC (55 ºF) and 55 ºC (131 ºF). Our toroidal models have very low losses, and regulation is maintained between 0.7% and 12.3%.

We understand that every customer’s job is unique, so we work closely with clients to identify the best toroidal power transformer for their specific application. To learn more about our range of toroidal medical power transformers, request a quote from our expert team today.

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