Toroidal Transformer

Toroidal transformers also called toroidal inductor transformers are used in a wide range of electronic circuits: power supplies, inverters and amplifiers, which in turn are used in most electrical equipment: televisions, radios, computers and audio systems.

Shuogong has very rich experience in the field of toroidal transformer manufacturing.

If you want to start a toroidal transformer business, the following can help you.

We introduce you from all areas of toroidal transformer design, manufacture, application and testing.

1. What is a toroidal transformer？

Toroidal transformer is a type of transformer, which is different from ordinary single phase transformer and three phase transformer.

Toroidal transformers are inductors and transformers that use a magnetic core with a toroidal (toroid or donut) shape.

They are passive electronic components consisting of a torus or toroidal core made of ferromagnetic material such as laminated iron, powdered iron, or ferrite, around which wires are wound.

Toroidal inductors/transformers are more compact than other core shapes because they are made from less material and include a centering washer, nut and bolt, resulting in a 50% reduction in design weight.

2. How does a toroidal transformer work?

The working principle of a toroidal transformer is essentially the same as that of a standard transformer.

The iron core of the toroidal transformer is made of high-quality cold-rolled silicon steel sheet (the thickness of the sheet is generally less than 0.35mm), which is rolled seamlessly, which makes the performance of the iron core better than the traditional laminated iron core.

The coil of the toroidal transformer is evenly wound on the iron core, and the direction of the magnetic field lines generated by the coil almost completely coincides with the magnetic circuit of the iron core. Compared with the laminated type, the excitation energy and iron core loss will be reduced by 25%.

The principle of the toroidal transformer is the same as that of the transformer, both of which work on the basic principles of electro-magnetic and magneto-electric conversion.

The following figure shows the principle of the transformer:

3. What are the advantages of toroidal transformers?

Both standard transformers and toroidal transformers have their own application scenarios and advantages and disadvantages.

The advantages of toroidal transformers are as follows:

• Toroidal transformer cores are more compact and they are made from less material.
• Lighter weight than standard transformers
• Toroidal transformers have lower secondary impedance and are more efficient, reducing effects such as distortion and fringing.
• Toroidal transformers radiate less electromagnetic interference (EMI) to adjacent circuits and are ideal for highly concentrated environments.
• The iron core has no air gap so the vibration noise is smaller.

4. What are the disadvantages of toroidal transformers?

Disadvantages of toroidal transformers are as follows:

The toroidal core transformer has high power conversion efficiency, but the disadvantage is that it is not easy to manufacture.

But when it is used at a lower operating frequency, the advantage of its small size is less obvious.

Because when the toroidal core transformer works at a lower frequency, the cross-section of the toroidal core will be relatively increased.

Which is because the toroidal core is easy to be magnetically saturated when working at a low frequency! It can only be solved by increasing the cross section.

Therefore, only when the toroidal core transformer works at a higher frequency, its small size advantage is revealed! But its high efficiency characteristics will not change.

In addition, the toroidal transformer has high brittleness, low thermal expansion capacity, and is easy to break.

Therefore, it cannot replace ordinary silicon steel sheet transformers in terms of power transformation.

5. Toroidal Transformer Sales Price

If you are looking for toroidal transformer manufacturers or suppliers, then you must be concerned about the toroidal transformer sales price.

Below we have sorted out the prices of toroidal transformers sold on some e-commerce platforms for your reference.

These toroidal transformer prices do not represent the price of toroidal transformers produced by Shuogong.

Shuogong is a leading manufacturer of toroidal transformers, you can contact us for preferential ex-factory prices.