Gowanda designs and manufactures toroidal transformers for a variety of power supply and conversion applications. A toroidal transformer is a transformer that is designed on a doughnut shaped core. Toroidal transformers offer small size, less leakage inductance and lower electromagnetic interference (EMI).

Since toroidal transformers are a sub-category of power transformers, a link to the Power Transformer theory page is provided below.

Toroidal Transformer Applications

  • Computer power supplies
  • Radio transmitters
  • Electromagnetic Interference (EMI) sensitive circuits
  • Any application requiring a transfer or conversion of electrical energy

Toroidal Transformer Design

  • It is typical for the power rating (expressed in VA), number of primary and secondary windings and their respective voltage and current levels of a toroidal transformer to be specified as a minimum requirement.
  • The operating frequency should be given to allow proper core calculations and sizing. Proper wire sizing is accomplished by specifying the voltage and current levels across and passing through the toroidal transformer windings.
  • Toroidal transformer designs vary widely in terms of power rating, inductance, voltage level (low to high), operating frequency, size, impedance, bandwidth (frequency response), packaging, winding capacitance, and other parameters. Silicon steel and nickel iron are available as tape wound cores or laminated pieces.

Photo Gallery Toroidal Transformers

This image shows the soldering of the lead terminations which make the connection on the printed circuit board for this small toroidal transformer. This transformer was for a medical application.

Each individual part is tested. In this image the soldered toroidal transformers are tested to see if they meet the client’s specifications. All data is saved for later use.

A small hook winding machine is used when the core is extra small. This machine winds directly around the core itself creating a toroidal transformer or inductor.