A transformer, as its name implies, is an electronic power instrument that changes the voltage.

　　The frequency of our daily production and production electricity is 50 Hz, and we call this kind of alternating current low-frequency alternating current. If the transformer works at this frequency, we call this transformer a low-frequency transformer, also called a power frequency transformer. This kind of transformer has a large volume and low efficiency. The iron core is stacked with mutually insulated silicon steel sheets, and the primary and secondary coils are wound with enameled wires. The primary and secondary voltages are proportional to their turns.

　　In addition, some transformers work at tens or even hundreds of kilohertz, which are called high-frequency transformers. High-frequency transformers generally do not use iron cores, but magnetic cores. The high-frequency transformer is compact in size, has fewer primary and secondary coil turns, and has high efficiency.

　　The difference between high-frequency transformers and low-frequency transformers lies in the frequency, which leads to some differences in material selection. The working principle of the low-frequency transformer is the same as that of the high-frequency transformer. No matter whether the operating frequency is high or low, energy is transmitted through electromagnetic induction.

　　Due to the different frequencies of high frequency and low frequency, the high frequency can only be used in circuits with high frequency and the frequency of the excitation source matches the frequency of the transformer, while the low frequency is the opposite and cannot be mixed.

　　Power frequency transformers are generally used to convert 220V or 110V power frequency high voltage into power frequency low voltage, which is used for power supply of circuit boards of small household appliances, such as soybean milk machines, smoke exhaust ventilators, stereos, etc.; High-frequency transformers are used in many occasions such as mobile phone chargers, electronic ballasts, switching power supplies, color TV power supplies, computer power supplies, LCD drivers and power supplies.

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