Guide of Isolation Transformer and Toroidal Transformer

Transformers can be found everywhere in our life, as long as the electrical equipment related to power supply, basically can not be separated from the transformer. Today SITONG share some transformer-related knowledge with you.

High-frequency and low-frequency

In general, low frequency transformer refers to the "industrial frequency transformer", it is working at (50Hz), used to change the voltage, low frequency transformer using the core is generally high permeability of silicon steel sheet.

High frequency transformer refers to the work in the high frequency, the role of the transformer, because the magnetic field frequency is very high, silicon steel sheet will produce eddy currents, so high frequency transformers generally use "high frequency ferrite" for the core.

The difference between high-frequency transformers and low-frequency transformers is for the frequency, the working frequency is different, which leads to the selection of materials will have some differences. Low frequency transformer and high frequency transformer working principle is the same, regardless of the working frequency is high or low, are through electromagnetic induction to transmit energy.

In the same power under the two transformers, high-frequency transformers will be much smaller than low-frequency transformers, in this case, high-frequency transformers will be only about one-tenth of the low-frequency transformers. This is because of the need to protect the low-frequency transformer to reduce the u-value, made of silicon steel, but the efficiency becomes worse, so to do a large volume of heat dissipation.

Why use toroidal transformers

Today, many electronic enthusiasts choose audio amplifier transformers are selected toroidal transformers, audio amplifiers using toroidal transformers is due to the characteristics of audio amplifiers decided.

With other equipment power consumption is basically different, audio amplifier power consumption not only changes quickly, and the magnitude of change is also large. This requires the transformer must be instantaneous overload capacity, fast response time, otherwise it will be easy to form noise, sound is not full, sound quality is not good, etc..

Toroidal transformer in the same volume due to the large capacity, direct coupling almost 0 delay response, can meet the audio power supply characteristics.

Isolation transformer

Definition of isolation transformer: transformers with two or more independent separate coils can be called isolation transformers, because the primary and secondary have been completely separated (isolated), is through the magnetic field to transfer energy.

The use of isolation transformers to pay attention to two points, one is the secondary ends of the transformer can not be grounded, the second is that the human body can not touch the secondary ends at the same time, otherwise, there is still a risk of electric shock.

Isolation transformer in the AC power supply output features.

A. Prevent the current distortion of the non-linear load to affect the normal work of the AC power supply and pollution of the grid, play a role in purifying the grid.

B. Sampling at the input of the isolation transformer, so that the distortion of the non-linear load current does not affect the accuracy of sampling.

C. If the load is unbalanced, it does not affect the normal operation of the voltage stabilizer.

D. The use of DC/DC converter to eliminate high-frequency transient interference.

The function of power transformer

In many electronic appliances use 220V AC as the power supply, in order to ensure the use of equipment in the process of personal safety of users, the need to isolate the 220V AC power supply, when the use of power transformers.

At the same time, the power transformer reduces the 220V AC voltage to a suitable voltage. T1 in the circuit is a power transformer with the role of voltage reduction and isolation.

In troubleshooting, it is often necessary to touch the components in the circuit in the energized state, or the ground in the circuit. After adding the power transformer can prevent the risk of electric shock.

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