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The Difference Between Toroids and Toroidal Power Transformers

Regardless of the shape, a transformer accomplishes one main task: transferring power between two separate parts of an electrical circuit. Transformers create isolation while carrying varying voltage and currents. A transformer is an integral part of most electronic systems.


Toroids are used throughout a wide spectrum of different industries, they are used in electronic circuits to help power devices, especially important in the medical field.

A power transformer is slightly different than a transformer, and they are ideally used when a high-efficiency power transfer is an absolute requirement. Devices can either operate continuously or non-continuously at full capacity, depending on the demands. Power transformers, like all transformers, have a foundation in the principles of electromagnetic induction. Two magnetically coupled coils form the base for primary and secondary toroidal core windings.

A toroidal power transformer is a highly specialized power transformer with primary and secondary coils wound around a doughnut-shaped core. As currents flow through the primary wire, electromagnetic forces are induced. Power is then transferred to the secondary coil. Toroidal power transformers have a unique shape when compared to other similarly powered transformers. Because of the shape of a toroid, they require shorter coils. Shorter coils allow for resistive losses as well as winding losses. A power transformer improves the overall efficiency of electronic devices.

Other benefits of a Toroidal Power Transformer include:

  • When compared to other power transformers, toroids can translate to lower temperatures
  • 100% of a toroidal core is used and wound upon
  • These devices have a high resistance to external magnetic fields
  • The construction of a toroid does not allow for outwardly radiated stray fields

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