In general, low-frequency transformers refer to “power frequency transformers”, which work at (50Hz) and are used to change the voltage. The iron cores used in low-frequency transformers are generally silicon steel sheets with high magnetic permeability.
High-frequency transformer refers to a transformer that works at high frequency and acts as a transducer. Because the frequency of the magnetic field is high, eddy currents will be generated in the silicon steel sheet (the conversion speed of the small magnet in the silicon steel sheet cannot keep up), so the high-frequency transformer Generally, “high frequency ferrite” is used as the core.
The difference between high-frequency transformers and low-frequency transformers lies in the difference in frequency and operating frequency, which leads to some differences in selection. The working principle of the low-frequency transformer is the same as that of the high-frequency transformer. No matter the operating frequency is high or low, 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 frequency and the excitation source frequency matches the transformer frequency, while low frequency is the opposite and cannot be mixed, even if high frequency does not match the frequency. is not available.
If the transformer transmits a certain amount of energy, the working frequency is high, the number of energy transmissions within a certain period of time is large, and the energy transmitted each time can be less, the material used for the transformer is small and the structural size is small. Therefore, for general high-frequency transformers, the number of coil turns Relatively few, the size can be made very small, and the number of turns of the low-frequency transformer coil is relatively large.
For the two 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 the low-frequency transformer needs to be protected, the u value is reduced, and it is made of silicon steel sheet, but the efficiency becomes poor, so a large volume of heat dissipation is required.