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About the loss of high-frequency transformers
In daily work and production, we often hear about transformer loss. Usually, we do not use professional terms, but how does the transformer produce the loss? What kinds are there? Next, a detailed introduction to the high-frequency transformer loss.
An efficient high-frequency transformer should have the following conditions: low DC loss and AC loss, the distributed capacitance of the winding itself and the coupling capacitance between the winding should be small.
1. Loss of the core
Hysteresis loss: It is proportional to the area of the DC hysteresis loop and linear to the frequency.
Eddy current loss Pc: Eddy current loss Pc=Cef2B2/ρ, where Ce is the dimension constant, ρ is the resistivity at the measured frequency f. With the increase of frequency, the proportion of eddy current loss in the total loss increases gradually. When the operating frequency reaches 200~500kHZ, eddy current loss is dominant.
When the AC excitation voltage is U1, according to the law of electromagnetic induction, U1=N1dΦ/dt, the induced potential of each turn, is not only the magnetic core section is larger around the equivalent one turn induced potential is U1/N1=ddΦ/dt.
2. Direct current loss
It's caused by a copper loss in the coil. To improve efficiency, choose a thick conductor and keep its current density in the range of 4 to 10A/MM2.
3. AC loss
It is caused by the skin effect of high-frequency current and the loss of magnetic core. The phenomenon that the high-frequency current always tends to flow from the surface of the conductor when passing through it is called the skin effect.
4. Residual loss Pr
EPC17-001 Electric SMPS Flyback EPC17 High-Frequency Transformer
