Transformers can be seen everywhere in our lives, and as long as electrical equipment related to power supply is related, they are basically inseparable. Today, I will share some knowledge related to transformers with you.

What is the difference between high-frequency transformers and low-frequency transformers?

In general, low-frequency transformers refer to "power frequency transformers" that operate at (50Hz) to change voltage. The iron core used in low-frequency transformers is generally high permeability silicon steel sheets.

A high-frequency transformer refers to a transformer that operates at high frequencies and plays a role in energy conversion. Due to the high frequency of the magnetic field, eddy currents can occur in the silicon steel sheet (the conversion speed of small magnets in the silicon steel sheet cannot keep up), so high-frequency transformers generally use "high-frequency ferrite" as the magnetic core.

The difference between high-frequency transformers and low-frequency transformers lies in their different operating frequencies, which can lead to some differences in talent selection. The working principle of low-frequency transformers and high-frequency transformers is the same, regardless of the operating frequency, energy is transmitted through electromagnetic induction.

Due to the different frequencies of high-frequency and low-frequency, high-frequency can only be used in circuits with high frequencies and excitation source frequencies that match transformer frequencies, while low-frequency can be used in the opposite direction and cannot be mixed, even if high-frequency frequencies do not match, they generally cannot be used.

If a transformer transmits a certain amount of energy with a high operating frequency and multiple times of energy transmission within a certain period of time, the amount of energy transmitted each time can be reduced. Therefore, the transformer uses fewer materials and has a small structural size. Therefore, for general high-frequency transformers, the number of coil turns is relatively small, and the size can be very small. For low-frequency transformers, the number of coil turns is relatively large. For two types of transformers with the same power, the high-frequency transformer will be much smaller than the low-frequency transformer. In this case, the high-frequency transformer will only be about one tenth of the low-frequency transformer. This is because it is necessary to protect the low-frequency transformer, reduce the u value, and use silicon steel sheets to make it, but the efficiency decreases, so a large volume of heat dissipation needs to be done.

Why do power amplifiers use ring transformers?

Nowadays, many electronic enthusiasts choose a ring transformer when choosing audio power amplifiers. The use of a ring transformer in audio power amplifiers is determined by the characteristics of audio power amplifiers.

Unlike other devices, audio amplifiers not only have fast changes in power consumption, but also have a large range of changes. This requires the transformer to have strong instantaneous overload capacity and fast response speed, otherwise it will easily form noise, insufficient sound, poor sound quality, and so on.

Due to its large capacity and almost zero delay response in the same volume, the ring transformer can meet the characteristics of audio power supply.

Advantages of using ring transformers in audio amplifiers:

1. High Electrical efficiency iron core without air gap, high stacking coefficient.

2. Small in size and light in weight, the ring transformer can reduce its weight by half compared to the laminated transformer.

3. The magnetic interference is relatively small, and the iron core of the ring transformer has no air gap. The windings are evenly wound around the ring iron core, resulting in low magnetic leakage and electromagnetic radiation.

4. The vibration noise is relatively low, and there is no air gap in the iron core, which can reduce the noise caused by the induced vibration of the iron core. The winding evenly and tightly wraps the circular iron core, effectively reducing the "buzzing" caused by magnetostriction