What is the use of a transformer and how it works
The transformer is an integral component of the power supply that pulls power from the wall outlet and transforms it or make it into power that can be used by an electronic device. The transferring of the AC signal is done only by means of a magnetic field at low loss. A transformer has two separate coils that have overlapping magnetic fields so that current flowing in one circuit is coupled to other. Transformers are used to get voltage gain and to step down power line voltages for power supplies. Ground isolation can be done by the help of transformers and transformers are capable to match impedances between devices.
- Transformer construction
- Transformer types
- Power transformer
- Transformer testing
- Distribution transformer
What is a toroidal transformer its uses and how is it different from a normal transformer
A toroidal transformer is a high-performance transformer, Its actual shape is created by revolving a circle around an axis exterior to the circle. These transformers are used as inductors in a circuit for low-frequency transformers and receivers because of their superior inductance and it can also carry a higher current than other similar constructed solenoids. They are as well used as normal transformers in power supplies. Toroidal coils cut down the resistance, due to the large diameter and lower number of windings. The magnetic flux ends at the core, so it can prevent energy absorption by any near objects.
Toroidal transformers are high-performance transformers among other transformers. They offer a smaller size, less leakage inductance, and lower electromagnetic interference. Their windings cool better because of the proportionally larger surface area. A 360-degree toroidal transformer has a high degree of symmetry and its geometry leads to the cancellation of the magnetic field outside of its coil, so the toroidal transformers have less leakage inductance and less EMI when compared to other transformers of equal power rating. The toroidal transformers with round core perform better than a rectangular-shaped toroidal transformer. Cancellation is more complete for a round type toroidal transformer and the round cross-section also gives a shorter turn length per unit of cross-sectional areas so lower winding resistances. The toroidal transformer has better winding to winding magnetic coupling because of its toroidal shape.
What is a toroidal current transformer
There is no primary winding in toroidal current transformers, in place of that the toroidal transformer is connected to the line that carries the current and the secondary of this transformer is portable. Most of the toroidal current transformers have only one winding and it can also function as the secondary winding. This toroidal current transformer has high performance.
Efficiency of the toroidal transformer
The cores of toroidal transformers are made up of a constantly wound ribbon, so there is no air gap. The windings are lightly wrapped over the full core permitting the toroidal transformer to work at a superior flux density than in normal transformers. Toroidal transformers could work at 1.6 to 1.8 tesla while the EI cores are restricted to 1.2 to 1.4 tesla. The magnetic flux of the windings is sloping in a similar direction as the grain-oriented core, so it can achieve high electrical efficiency.
How toroidal transformer is different from EI core transformers
Toroidal transformers can save space when compared to EI transformers, and also sometimes it can reduce the external magnetic field. These use a ring-shaped core, copper windings wrapped around this ring and tape for insulation. Toroidal transformers have lower external electromagnetic field when compared to EI transformers, higher cost as the winding requires more complex and slower equipment, less robust, and the central fixing is either bolt, large metal washers, and rubber pads or bolt and potting resin.
What are the advantages of toroidal transformers
Toroidal transformers have many advantages over the normal power transformers. Toroidal transformers can provide competent operation with low stray magnetic fields. These transformers are of small size so it can be used for any application. These transformers have high efficiency and low size and they can limit the external magnetic field.
What are the disadvantages of toroidal transformers
Toroidal transformers are not practical for some applications, gapped toroidal transformers require that the gap be filled with some type of insulating material to facilitate the winding process and this is an extra expense. Split core current transformer can be assembled directly on a conductor while toroids must be passed over a disconnected end of the conductor. Toroidal transformers are more expensive than the bobbin or tube wound transformer.