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Transformer Models
Three equivalent transformer models for your perusal.
http://www.ivesonaudio.pwp.blueyonde...lustration.GIF Each is reduced to its simplest form for comparison purposes, so all have constant mu, and no leakage or capacitance. The third, and much the simplest for visualising the view from the primary side, is very useful for understanding the lower frequency limit of an output transformer. Note that for other winding ratios, the load resistance RL3 in the third model should be multiplied by the impedance ratio, or the square of the voltage ratio, or the square of the turns ratio. Values of components shown are extreme for the purpose of illustration. Input is 240Vrms 50Hz. Graphs show currents on right axes and voltages on left. Labels refer to probe names on respective circuit. Note phase angle of magnetising current where it is shown on first (AmpTurns/Turns) and third graph. Last circuit and graph, bottom right, shows effect on magnetising current of removing the load. With more representative combinations of inductance, winding resistances and load, the effect would be less pronounced. The first model uses the basic equations for inductors. The coils input flux and output ampturns. The core inputs ampturns and outputs flux. Simple versions of the circuits for the core and coil are he http://www.ivesonaudio.pwp.blueyonde.../CoreModel.GIF http://www.ivesonaudio.pwp.blueyonde.../CoilModel.GIF Ian |
#2
Posted to rec.audio.tubes
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Transformer Models
PS
Note that for other winding ratios, the load resistance RL3 in the third model should be multiplied by the impedance ratio, or the square of the voltage ratio, or the square of the turns ratio. As should the secondary winding resistance, RW3. Ian |
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