How Are Auto, Toroidal, And Isolation Transformers Different?

What are auto-transformers?

Auto transformers are electrical transformers having only a single winding; thus the single coil acting alone, without any kind of automatic mechanism like in other transformers. In fact, the single coil itself plays the role of both primary and secondary winding’s, with one end acting as primary, and the other end acting as the secondary. In this way, auto-transformers have the benefit of being smaller, lighter, and cheaper than other double winding transformers; but with the disadvantage of not providing isolation between the primary and secondary circuits.

How Are Auto, Toroidal, And Isolation Transformers Different - Miracle Electronics

Auto transformers also involve lower losses, lower leakage reactance, lower excitation current, and higher VA rating. However, these transformers are not completely shielded, thus they emit a humming sound. Auto-transformers are used to step up or step down voltages in the 110-120 V and 220-240 V ranges. They are generally found in large three-phase electric power distribution networks to interconnect sub-transmission stations. This is because they are highly efficient in converting voltages.

What are toroidal transformers?

Toroidal transformers are transformers that use magnetic cores that are ring or doughnut-shaped. They are passive electronic components that consist of a circular ring core made up of ferromagnetic material like laminated iron, iron powder, or ferrite. Wires are wound around this ring shaped core, saving on a lot of space. The main advantage of these doughnut-shaped transformers is that due to their symmetry, the amount of magnetic flux that escapes outside the core is low, thus radiating lesser electromagnetic interference. This boosts up the efficiency and performance of these transformers. Thus, toroidal transformer in India is designed to eliminate the external magnetic field noise interference around the transformer. This is why they are used in a wide range of applications like amplifiers, inverters, and power supplies, which in turn power up appliances like televisions, radios, audio systems, and computers.

What are isolation transformers?

Isolation transformers are transformers that are used to transfer electrical power from a source of alternating current power to an equipment, while isolating the device from the power source. This involves higher safety since they provide galvanic isolation and protect the device against electric shock. Thus, power is transferred between two circuits that are not connected, while suppressing electrical noise in sensitive devices. This is the reason isolation transformers are used for power supplies for appliances like medical devices and laboratory instruments. Isolation transformers block the transmission of the DC component in signals from one circuit to another, but allow the AC components in signals to pass. These transformers have a ratio of 1:1 between the primary and secondary windings, which helps in protecting the circuit and the operator from electric shock between the energized conductors and the ground. Isolation transformers that are sold specially for isolation purposes are built with special insulation between the primary and secondary, and are specified to withstand high voltages between the windings.

You can see how different transformers are used to satisfy the requirements of different equipment. So, whichever equipment you want to use, you need to get the right kind of transformers for it. And for this, you need to approach the right kind of manufacturer too. Miracle Electronics is the reputed transformer manufacturer who you can approach to get the best quality auto, isolation, and toroidal transformer in India.


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