What Is a Toroidal Transformer?
A toroidal transformer is a large type of transformer used in home appliances and other electronic equipment with high requirements. Its main use is as a power transformer. A toroidal transformer is one whose windings are arranged in a circular pattern in space. According to their structure type, toroidal transformers can be divided into concentric and cross-linked types；Dry and oil-immersed insulation can be classified according to their method of insulation. Iron cores of toroidal transformers are made of cold-rolled silicon steel sheets (generally below 0.35mm in thickness), which are seamlessly rolled into circular shapes, which improves performance over laminated cores.
How Does Toroidal Transformers Work?
As with other transformers, toroidal transformers work according to the basic principles of electro-magnetic and magneto-electrical transformation. works by making an iron core with cold-rolled silicon steel sheet, which is then induced by a magnetic circuit.
What are toroidal transformers used for?
There are many electronic circuits that use toroidal transformers:
- Power Supplies
- Telecommunications
- Musical instruments
- Medical devices
- Amplifiers
- Inverters
- TVs
- Radios
- Illumination
- Beauty Equipment etc.
10 key Advantages of Toroidal Transformers
1. High electrical efficiency：
With the toroidal transformer core made of continuous silicon steel strips, the magnetic flux is guided uniformly after annealing. Additionally, the toroidal transformer windings are tightly wrapped around the toroidal core, so there is a high magnetic flux density, and so the toroidal transformer can achieve a high electrical efficiency of 95%.
2. Less magnetic interference：
Toroidal transformers have no air gaps, which results in low magnetic leakage and low electromagnetic radiation, making them ideal for high-sensitivity electronic equipment. For example, toroidal transformers are used in low-level amplifiers and medical equipment.
3. Low temperature rise:
In the same power range, the temperature rise of the 50W toroidal transformer is very low while the temperature rise of the 50W ordinary transformer is very high.
4. Low-temperature properties:
It can still start normally and work for a long time in the environment of minus 40 degrees.
5. Lower Noise Level：
Unlike traditional transformers, toroidal transformers have no air gaps, so they are quieter and have less electromagnetic interference than traditional transformers. They are widely used in audio power amplifiers and instruments that are prone to electromagnetic interference.
6. Low Off Load Loss：
A low standby power consumption, a low no-load loss saves more energy while in standby mode.
7. Flexible design:
The volume of the toroidal transformer can be customized according to customer requirements. The height and outer diameter can also be customized according to customer requirements, without requiring any mold openings.
8. Small Size and lght weight：
A toroidal transformer may have a half the weight of laminated transformers so long as the iron core’s cross-sectional area remains the same, and the ratio of the iron core’s length, width, and height can be easily manipulated.
9. Easy Installation：
With a single center bolt, it is easy install toroidal transformer in the central hole, which provides fast and simple installation.
10. More economical:
Toroidal transformer cores consume less energy and less weight than conventional transformers, providing better cost savings and higher returns on investment because they are made of fewer materials.
Disadvantages of Toroidal Transformers
The biggest disadvantage of a toroidal transformer is its limited power and volume designs, and the minimum power is only 15W.
What is difference between toroidal transformer and standard transformer?
- Efficiency：Under the same power, the efficiency of 50W toroidal transformers is 86%-90%, whereas that of 50W standard transformeris 80-84%.
- Temperature rise：In the same power range, the temperature rise of the 50W toroidal transformer is very low while the temperature rise of the 50W standard transformer is very high.
- Cost：Above 200W, toroidal transformers cost little, and standard transformer cost a lot.
- Interference：Transformers with toroidal cores have very little magnetic leakage, but standard transformers have several obvious leaks and low-frequency interference.
- Lifetime：Transformers with toroidal windings have a longer life than transformers with standard windings, despite the fact that there is no obvious material difference.
- Low-temperature properties:It can still start normally and work for a long time in the environment of minus 40 degrees.
- Flexible design: The volume of the toroidal transformer can be customized according to customer requirements. The height and outer diameter can also be customized according to customer requirements, without requiring any mold openings.
