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How Toroidal Transformers Differ From EI transformers


There are several options to consider when choosing power transformers. Although each type serves a similar purpose, they are different enough not to be used interchangeably. These devices (electrical transformers) are a necessity of modern electronics. Transformers are wound with wire around an iron core. Traditionally, EI (rectangle) cores are the most popular option on the market. In modern electronics, toroids are often the common option. They have many benefits, which include:

  1. Size
  2. Power
  3. Cost
  4. Shape
  5. Noise
  6. Heat

Creating a toroidal transformer is like that of an EI transformer. For instance, toroids need primary and secondary windings to create consistent step voltages (up and down). As mentioned above, the function of a toroid and EI core are similar, so it is in their configuration that the two differ. An EI core consists of a coil construction and rectangular core. Toroidal electrical transformers are shaped like a donut with a ring-shaped coil winding.

The primary purpose of the round shape of a toroidal transformer is to radiate less magnetic flux. The strength generated by the electric current is known as the flux. With an EI magnetic core, large amounts of magnetic flux is dissipated. Since toroidal electrical transformers radiate less magnetic flux, they require less shielding.

The size and weight of a toroidal transformer make them more beneficial than using EI magnetic cores. Toroidal transformers are smaller while still providing the same effect. They are also lighter than EI cores making them appealing when used for lightweight devices.

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