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The role of high frequency transformer_where is the high frequency transformer used

The role of high frequency transformer_where is the high frequency transformer used

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  • Time of issue:2020-08-31
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The role of high frequency transformer_where is the high frequency transformer used

  High frequency transformer function

  Now, switching power supplies generally use half-bridge power conversion circuits, which contain high-frequency transformers and transistors. When the circuit is working, the transistors are turned on in turn to generate high-frequency pulses with a frequency of 100KH, which are worthy of high-frequency pulses. Then they are stepped down by a high-frequency transformer, and finally the alternating current with a lower voltage is output. The specific voltage value is determined by each winding coil in the high-frequency transformer. The turns ratio is determined. Generally, three transformers are used, which are called the main transformer, the drive transformer and the auxiliary transformer. Each transformer has its own measurement specifications and functions, so one is indispensable.

  Generally, high-frequency transformers can be divided into different grades according to the operating frequency, such as 10kHz-50kHz, 50kHz-100kHz, 100kHz-500kHz, 500kHz-1MHz and above 1MHz. Moreover, the transmission power of the transformer is inversely proportional to the operating frequency. If the transmission power is large, the operating frequency is low, and vice versa.

  Next, let's discuss how to correctly choose the core of the switching transformer.

  For the transformer, the magnetic core is very important, so its choice is also critical. If you choose it, the transformer can achieve good results.

  Generally, magnetic materials are used in transformer cores, and the main component is MnZn. However, due to differences in formulas and production processes, there are many grades of magnetic materials, and the characteristic parameters of each grade of magnetic materials are also different, including use frequency range, initial permeability, specific loss factor, specific temperature coefficient, saturation flux Density, Curie temperature, resistivity and density, etc. Generally speaking, there are EI, EE, EC, U, UF and other types of magnetic cores. Generally, when selecting, we should determine it according to the highest working frequency of the transformer during use.

 

  Where is the high frequency transformer used

  High-frequency transformers are power transformers whose working frequency exceeds the intermediate frequency (10kHz). They are mainly used as high-frequency switching power transformers in high-frequency switching power supplies. They are also used as high-frequency inverters in high-frequency inverter power supplies and high-frequency inverter welding machines. Change the power transformer. According to the working frequency, it can be divided into several grades: 10kHz-50kHz, 50kHz-100kHz, 100kHz~500kHz, 500kHz~1MHz, and above 1MHz. In the case of relatively large transmission power, power devices generally use IGBTs. Due to the tailing phenomenon of the turn-off current of the IGBT, the operating frequency is relatively low; if the transmission power is relatively small, MOSFETs can be used, and the operating frequency is relatively high.

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What is a power frequency transformer? What is the difference between a power frequency transformer and an ordinary transformer
What is a power frequency transformer? What is the difference between a power frequency transformer and an ordinary transformer
Power frequency transformers are also called low frequency transformers to show that they are different from high frequency transformers used in switching power supplies. Power frequency transformers have been used in large quantities in traditional power supplies in the past, and the stability of these power supplies uses linear adjustment, so those traditional The power supply is also called a linear power supply. The power frequency generally refers to the frequency of the mains electricity, which is 50Hz in our country and 60Hz in other countries. The transformer that can change the voltage of the alternating current at this frequency is called a power frequency transformer.
See more information
Power frequency transformers are also called low frequency transformers to show that they are different from high frequency transformers used in switching power supplies. Power frequency transformers have been used in large quantities in traditional power supplies in the past, and the stability of these power supplies uses linear adjustment, so those traditional The power supply is also called a linear power supply. The power frequency generally refers to the frequency of the mains electricity, which is 50Hz in our country and 60Hz in other countries. The transformer that can change the voltage of the alternating current at this frequency is called a power frequency transformer.
The role of high frequency transformer_where is the high frequency transformer used
The role of high frequency transformer_where is the high frequency transformer used
Now, switching power supplies generally use half-bridge power conversion circuits, which contain high-frequency transformers and transistors. When the circuit is working, the transistors are turned on in turn to generate high-frequency pulses with a frequency of 100KH, which are worthy of high-frequency pulses. Then they are stepped down by a high-frequency transformer, and finally the alternating current with a lower voltage is output. The specific voltage value is determined by each winding coil in the high-frequency transformer. The turns ratio is determined. Generally, three transformers are used, which are called the main transformer, the drive transformer and the auxiliary transformer. Each transformer has its own measurement specifications and functions, so one is indispensable.
See more information
Now, switching power supplies generally use half-bridge power conversion circuits, which contain high-frequency transformers and transistors. When the circuit is working, the transistors are turned on in turn to generate high-frequency pulses with a frequency of 100KH, which are worthy of high-frequency pulses. Then they are stepped down by a high-frequency transformer, and finally the alternating current with a lower voltage is output. The specific voltage value is determined by each winding coil in the high-frequency transformer. The turns ratio is determined. Generally, three transformers are used, which are called the main transformer, the drive transformer and the auxiliary transformer. Each transformer has its own measurement specifications and functions, so one is indispensable.

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