Working Principle, Calculation Formula And Application Characteristics OF Step-Down Transformer

A transformer is a static device because it does not have any moving parts. Its main function is to transfer power between circuits by changing voltage and current rather than frequency. The classification of transformers can be divided according to functions such as boost transformers and step-down transformers. A booster transformer is used to raise voltage from low voltage to high voltage, while a step-down transformer is used to lower voltage from high voltage to low voltage. In this article, Xiaobian briefly introduces the working principle, calculation formula and application characteristics of the down-voltage transformer.

What Is Step-Down Transformer?

A transformer that uses a high output voltage with less current to convert a low output voltage through a high current is called a step-down transformer, and the transformer has two types of windings, namely primary and secondary windings. The step-down transformer structure is shown as follows:

For example, the power supply circuit uses a voltage range of 230v to 110v, but in electrical equipment, it is generally not higher than 16v. So to overcome this voltage problem, one was used

Step down the transformer so it can go from 230v down to 110V and finally down to 16V.

Working Principle OF Step-Down Transformer

The working principle of step-down transformers is Faraday's law of electromagnetic induction. In a transformer, mutual inductance is required between the two windings in order to transmit. In Faraday's law, once the magnetic flux of the connected circuit changes, an electromotive force will be induced in the circuit proportional to the rate of flux change.

The induced electromotive force can be determined by the number of windings present in the transformer, which is also known as the turn ratio. The voltage reduction capacity of the transformer mainly depends on this turn ratio. When the number of windings present in the secondary coil is lower than that of the primary coil, the magnetic flux of the secondary wire is also lower than that of the primary wire.

As a result, the electromotive force induced in the secondary coil is lower, so the voltage at the secondary winding is reduced compared to the primary winding.

Step-down Transformer Calculation Formula

The step-down transformer formula is Ns/Np =Vs/Vp.

'NS' is the number of secondary windings, 'Np' is the number of primary windings, 'Vs' is the secondary voltage, and' Vp 'is the primary voltage.

In a step-down transformer, the number of secondary windings is always less than the number of primary windings, namely :NS< Np.

Main Types OF Step-Down Transformers

Step-down transformers are divided into single-phase, central phase and multi-tap three kinds, as follows:

Single-phase transformers are used to lower the current rating as well as the input voltage to provide less voltage and output current, such as 12V AC.

The center tap consists of a primary and a center split within the secondary, so it provides a center split output voltage, such as 12v to 0v to 12v.

Multiple taps There are a number of taps in the secondary winding, and these are used to get the preferred output through the secondary lines (e.g. 0 to 12v, 0 to 18v).

Step-Down Transformer Structure

A step-down transformer can be constructed using two or more wire blacks wound around the transformer core. High performance transformers mainly consist of ferromagnetic cores because this material uses primary wires to magnetize and transfer energy to secondary coils.

To make a coil in a transformer, any type of wire can be used, but the best is a magnetic wire with gauge 28, which is a thin copper wire with an insulating coating. To make the primary coil, apply pressure to the wire in the washer area. If needed, wrap around it in layers. Count the number of windings and write it down.

When wrapping is complete, keep both ends open to connect to the power supply and use masking tape on the wire area to secure it in place. When designing this step-down transformer, there should be fewer windings in the secondary coil. The actual amount depends mainly on the required voltage, which can be calculated by the above transformer formula.

The Main Application Range OF Step-Down Transformers

The application of buck transformer includes the following aspects:

Electrical isolation

Voltage stabilizer

inverter

Distribution network

Household appliance

Transmission line degradation

adapter

CD player

recharger