[SOLVED] Simple transformer question about input and output power

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Zak28

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A flat spiral transformer with a 1:100ratio has a secondary with 92,100XL of impedance @ 50Mhz. The primary has 24V square 50% duty pulsing at said frequency. Is the max secondary power and current I=Vp/XL which is 2400Vp/92100XL = 26mA and P= 2400Vp*26mA which is 62.4W? Is it pointless to input any more than 63W into the primary?

I understand there are resistances and parasitics which I do not account for, but I choose to keep this simple. I also understand driving it at its resonant frequency is optimal for max power output but I need different frequencies for the circuit.

Greatly appreciated.
 
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Which impedance are you describing with XL? A transformer has main and leakage inductance. Refer to a transformer equivalent circuit for clarification.
 
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I think he is referring to the main inductance referred to the secondary, but a clarification is indeed needed.
 
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The leakage inductance will dominate the power transfer ...
 
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CataM said:
I think he is referring to the main inductance referred to the secondary, but a clarification is indeed needed.
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I was referring to the secondary coil.
I thought xfmrs have 2 inductances - 1 per winding.
 

You need at least three parameters to describe a transformer, e.g. primary, secondary and coupling coefficient, or magnetizing inductance, leakage inductance and winding ratio. As you have been told, it's the leakage respectively coupling that limits the power transfer in the first order, not the primary or secondary inductance.

You can however derive different parameter sets that describe the same transformer, you really should learn about transformer equivalent circuits to understand their relation.
 
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