An Introduction to Toroidal Power Transformer

As you might already know, transformers are devices that transfer power between two parts of an electrical circuit by creating an isolation with varying current and voltage. They are an integral part for almost all electrical applications.

Power transformers, 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.

What are Toroidal Power Transformers?

Toroidal 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.

Advantages and Applications

Toroidal transformers are much more compact than conventional power transformers of the same ratings. In addition, the improved efficiency can translate to lower consistent 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” and make less sensory noise than conventional components, 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.

Here’s a short video demonstrating how a toroidal transformer differs from a traditional transformer.

Learn More

Shreejee Electronics is an eminent manufacturer of standard and custom toroidal power transformers. We are proud to offer over 37 different models to suit customer’s specific application requirements. Our power transformers for medical applications are equipped with dual windings that allows for series and parallel connections, depending on system requirements.

Generally, these transformers are 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 0.4% and 13.7%.

We know, every client’s job is unique, hence, we work closely with clients to identify the best toroidal power transformer for their unique requirement. To learn more about our range of toroidal transformers, request a quote from our expert team today.

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