2 minutes reading time (475 words)

How Do Toroidal Transformers Work?

Toroidal transformers are used in electronic applications that step up or down a voltage or for the isolation of electronic equipment from a source of voltage. Different transformers are used for different applications. It is important to be careful in choosing the right transformer unit for your requirements. At Midwest Current Transformer, we offer toroidal transformers (CT) for a wide range of power applications.

 Alternating current (AC) electricity moves in different directions within a sine wave pattern. Standard AC voltage starts at 0 V. Then elevates to a positive peak position, and subsequently drops to 0 V within the first half of the cycle. It then elevates once again to a peak in the opposite direction and descends to zero once again. This occurs 60 times within one second which results in 60 cycles – also referred to a 60 Hz.

Changing the AC Voltage

The Toroidal current transformer is found in large power generating stations and in the tiniest battery charger. It changes the AC voltage from one level to the next. The transformer’s input connects to the primary coil. This coil of wire wraps around a ferromagnetic core of the transformer which is donut shaped. A positive magnetic field is developed by the electricity passing through this coil. The field races to a peak, which subsequently collapses when the voltage drops to 0 V, during the first half of the cycle. As the electricity moves in the opposite direction passing through the coil, a negative magnetic field is produced, which also drops when the voltage comes back down to zero once again.

The Secondary Coil

As these magnetic fields growing collapse, they travel through the secondary coil of the current transformer. The secondary coil is a coil of wire wrapped around the identical core that is the primary coil. The output voltage is produced as the magnetic fields pass through the secondary coil. The quantity of voltage produced correlates with the number of coils in the secondary in comparison to the primary. For instance, if the ratio is 1:2, the voltage is doubled. The ratio is 2:1, the voltage is cut in half.

Transformer Core

The core of this transformer, consisting of a strip of steel tightly wrapped enhances the increase and contraction of the magnetic fields and enables them to stimulate the voltage into the secondary coil.

To learn about the exceptional toroidal transformers we offer at Midwest Current Transformer, call our team today at 800.893.4047 or email This email address is being protected from spambots. You need JavaScript enabled to view it..

Is There a Difference Between A Donut And Toroidal...
Why are Current Transformers Necessary?