frequency effect on secondary transformer

what will be the effect on voltage of secondary transformer if frequency is doubled on primary side,keeping rest of the parameters constant as before,let us assume turns ratio 1:2.. No calculation only concept please.

effect on secondary winding

what will be the effect on secondary winding if dc current or voltage applied to the primary.

(yes it is known that frequency must be there to primary winding, but there are some effect on secondary winding if dc input is applied to primary) and that effect can be traced by applying capacitor to the secondary winding.

increasing frequency leads to link more flux in the secondary coil of the transformer, and linking more flux increases the EMF induce in the secondary coil.
and and according to the emf equation also E=4.44*f*N*fi. where 'fi' is flux linkage, N is no. of turns and f is frequency.

Hi,


As long as the transformer is not saturating...
The voltage ratio behaves like the turns ratio. Independent of frequency.

Klaus

For the ideal transformer model, frequency does not matter. The output voltage is doubled and the output current is half of the input current. Detailing the imperfections in a transformer will show the effects of frequency.

Increasing frequency is associated with increasing losses due to induced currents in the core material, increased losses in the windings as current tends to flow near the surface of wire at higher frequencies, and increased importance of capacitance between windings.

Decreasing frequency is associated with leakage inductance resulting in high primary currents that are not transferred to the secondary and with saturation of the magnetic material reducing the permeability significantly (also higher primary current not transferred to secondary). Both of these effects have been used in specific circuits. Leakage inductance is useful for the "flyback transformer" and saturation is used in "Saturable Reactors" and "Magnetic Amplifiers".

Decreasing frequency is associated with leakage inductance resulting in high primary currents that are not transferred to the secondary and with saturation of the magnetic material reducing the permeability significantly (also higher primary current not transferred to secondary). Both of these effects have been used in specific circuits. Leakage inductance is useful for the "flyback transformer" and saturation is used in "Saturable Reactors" and "Magnetic Amplifiers".

Click to expand...

You are apparently talking about magnetizing rather than leakage inductance. Leakage inductance causes a voltage drop between primary and secondary transformer winding which increases respectively decreases with frequency. It's also absolutely unwanted in flyback transformer.

Answer for post 1
• Output voltage will increase slightly when double the frequency when double the frequency

When doubling the frequency, flux density will become half it will reduce the core loss hence the output voltage drop due to core loss will reduce and output voltage will increase

Answer for post 2
• No effect on secondary (Negligible drop) if the applied DC is not shooting the flux density beyond 30% of saturation flux density
• Output voltage will reduce if the applied DC is shooting the flux density beyond 60% of saturation flux density
• Output voltage will be distorted/dropped if the applied DC is shooting the flux density beyond 100% of saturation flux density

FvM said:

You are apparently talking about magnetizing rather than leakage inductance. Leakage inductance causes a voltage drop between primary and secondary transformer winding which increases respectively decreases with frequency. It's also absolutely unwanted in flyback transformer.

Click to expand...

Yes, you are correct. I was describing Magnetizing Inductance. Thanks.