Efficiency of Transformer

transformer.

What frequency? What power level? Please describe your test circuit. How are you measuring efficiency?

What frequency and power level are we talking about? Very different problems at 60 Hz than at 10 MHz.

thats a wind open area. the first problem to be concerned about is the DC resistance in the primary and secondary windings. the primary winding dc resistance can be scaled to the secondary windings in the same manner as the voltage is scaled. for example, if you had lets say 30 ohms of DC resistance on the primary and the ratio was 10:1, for a rough guess you could assume that you will have an effective resistor drop in the secondary load circuit of 3 ohms. then talking into account the Dc resistance in the secondary winding compounds the problem. then you have the saturation problem of the transformer that also plays a roll in the efficiency along with the way its would on each other, capacitance built up, core type etc.

if you need a nice PDF to look at here you go.

and if your bored

I think charles is using a 12 volt ac signal, with a current of 10mA i dont know the frequency he is using

roy

I think charles is using a 12 volt ac signal, with a current of 10mA i dont know the frequency he is using

roy

Hi I am using a 12v supply and a frequecy of 5KHz

I am using formula current*voltage*cos?/2 for power at input

Using P=IV at output

Cheers

i don't remember dividing the angle by 2?

P= I*V*cos(PhaseAngle);

or am i missing something here?