Types of Electrical Transformers

Types of Electrical Transformers
Besides varying in size, transformers can be categorized into different types to meet energy needs.

Voltage Transformers
Voltage transformers can also be called “potential transformers.” They step down a large voltage and operate in parallel with the input current to produce a lower voltage in the output current.

Power Transformers
These are step-up transformers, increasing voltage without changing the frequency. As mentioned earlier, these transformers have no moving parts and use Faraday’s law to transfer current. They come in three sizes: small, medium, and large. The largest power transformers also require auxiliary coolant to operate.

Air Coil Transformers
The third type of transformer is the air coil transformer. These transformers are used in small devices and therefore do not have a metal core to generate the magnetic field for current transfer. Instead, the primary and secondary windings are wound on a low-conductivity material, such as plastic or cardboard. The magnetic connection between the windings and the air passing through them facilitate current transfer.

PCB Transformers
As the name suggests, these transformers are designed for use on computer circuit boards. They isolate the current and are responsible for reducing the voltage on the board to a safe level.