That makes little sense.if you observe the attached, then the transformer with a primary inductance of just 200mH ends up having a power factor of just 0.03. As such, it needs a VA rating of 860VA to supply the 24W output.
resulting in overall impedance which limits current.
Thanks, by definition, power factor is [real power] / [apparent power.]That makes little sense.
What makes you think that is true?
Better say if you had, but you actually don't have. It's just a speculation due to lack of knowledge. Reading only this thread we won't expect that are you are working in electronic design since many years....so if you have loads of magnetising current in the primary, then your primary VA (apparent power) is very high
An average detailed datasheet of a 50 VA Talema toroid transformer specifiesI must say that the failure of all 50Hz transformers (in their datasheets) to state L(pri) and R(pri) and r(sec) is very unfortunate.
They state efficiency, but dont state what the conditions under which that is measured.
So its not good.
Low magnetizing current means high impedance, means high inductivity, means high winding count.but its cheaper to make them with low magnetising current,
Thankyou for that...great points, thats very interesting and worth looking in to....cupoftea, a factor you are failing to take into account in your simulations of extreme transformer magnetizing current is non-linearity of the core magnetic properties. The sim in post #1 assumes a primary inductance of 200 mH. Such an inductance would have so few turns that the core would pushed FAR into saturation. The core loss would be so high that the transformer would catch on fire.
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