Step Up and Step Down Transformer: Know How It Works

Step Up and Step Down Transformer

A transformer is a stationary device responsible for transferring AC electrical power between two circuits at the same frequency. Since the voltage level usually changes during transmission, the voltage can be increased or decreased using step up and step down transformers depending on the requirement.

A step up transformer increases the voltage at the output end, while a step-down transformer decreases the voltage at the output end. Here is a brief comparison between step up and step down transformers which will help you to understand their difference better.

Difference Between Step Up and Step Down Transformer


The primary difference between step down and step up transformers is that in step up the voltage is raised at the output end whereas in step-down transformer it is dropped, and that is what their names suggest. The output voltage rating in step-up transformers is generally 11000 volts or more, whereas it is 110 volts, 24 volts, 20 volts, etc. On a step down transformer, it means that a step up transformer can increase the voltage from 220V-11KV or more whereas a step-down transformer can reduce it from 440V to 220V or 220V to 110V, 110V to 24V, and so on.

Winding and current

There is a difference in the windings of both step up and step-down transformers. The primary winding has a high voltage winding, while the secondary winding in a step up transformer is a high voltage winding. And thus the current is high on the secondary winding in step down and low in step-up transformer. So, if you are looking for a transformer manufacturer in India, it is better to have knowledge about the primary and secondary windings of a transformer first.

step up transformer manufacturer

Size of the conductor

In a step-up transformer, the primary winding is made of thick insulated copper wire, while the secondary winding is made of the same material. Therefore, it is important to assess the thickness of the windings and find the right size of the conductor as per your requirement while going to the step-down transformer manufacturer.

step down transformer manufacturer

However, according to Ohm’s law, a coil with a higher voltage will have a higher current because voltage and current are directly proportional. However, in a transformer, both the coils have the same power, and thus the current becomes inversely proportional to the voltage.

Appliances that work on these transformers

Step up transformers are commonly used in power plants, X-ray machines, and microwaves, while step-down transformers are used in voltage converter devices, door bells, etc.

Mechanism of Working of A Step Up Transformer and Step Down Transformer

Transformers, in general, are composed of two or more coils of insulated copper wire wound around an iron core, which become magnetized when an input voltage is applied to the primary coil. This magnetic iron, in turn, gives the output voltage as an end result to the voltage across the secondary coil.

What makes the voltage transformation?

The winding turns in the primary and secondary winding determine the amount of voltage change at the transformer end. For example, if the primary coil has 50 turns and the secondary coil has 100 turns, the ratio of these turns, i.e. 1:2, will determine the percentage of input to the output voltage.

Thus if you put 220 volts on the information, you will get 440 volts at the voltage output. Similarly, the primary coil will have more turns in the booster transformer as compared to the secondary coil.

How to control the voltage of a transmission line at a distant point?

When it comes to finding a suitable alternative for controlling the voltage of the transmission line from a point away from the main transformer, the most convenient machine is the booster transformer, whose secondary is connected in series to the transmission line and then adjusts the voltage. is required. can be changed accordingly.

However, low quality and cheap boost transformers may not do the job efficiently. Thus, if you are investing your money in buying one of these, make sure that, you get your machine only from the best manufacturers of Booster Transformers in India.