High frequency sinusoidal signal transformers.

[dalu12]

Hello. Please show me how I can be calculated, a transformer used at frequencies of the order of tens of kilohertz, and applicable to the sinusoidal signal, not rectangular, or other shapes, as used in SMPS.

Thank you for your kindness.

 

[KlausST]

Hi

What about input, output, isolation voltage?
Current, power, size, loss...

Klaus

 

[BradtheRad]

Shape a square wave into a sine wave via LC arrangement. Simulation below illustrates concept. Op amp automatically detects resonant frequency. By changing state each time the sine crosses 0V, thus it sustains oscillations.

Values need to be adjusted in order to optimize it for efficiency. You can add a plain inductor inline with capacitor and primary, creating an LLC resonant converter.

 

[FvM]

Calculation of mid frequency transformer uses the same formula as for mains frequency, but different core material and operational flux.