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Created | March 21, 2013 |

Last modified | March 21, 2013 |

Tags | inter-winding-capacitance resonance transformer |

This simulation calculates the parasistic or stray capacitance that would have to appear in parallel with the secondary in order for a measurement of the primary inductance to exhibit a resonance at 50kHz.

Simulate > Frequency Domain > Run Frequency-Domain Simulation

Suppose you have a perfectly coupled transformer (i.e. coupling factor K = 1) with a total secondary inductance of 242mH and a pri:sec turns ratio of: 1:50.

This simulation calculates the parasistic or stray capacitance that would have to appear in parallel with the secondary in order for a measurement of the primary inductance to exhibit a resonance at 50kHz.

To see the expressions used to calculate the component values, double click on the component symbols or do:

Right-click > Edit Parameters

Note that in CircuitLab the turns ratio of the transformer symbol is very confusing and poorly identified: for a primary inductance of L, the secondary inductance is given by L/N^2.

To simplify the calculations in this example, the transformer is mirrored horizontally so that the L_PRI value in the symbol actually represents the SECONDARY inductance on the right hand side of the circuit and the actual primary inductance on the left side in the diagram is given as L*N^2.

Simulate > Frequency Domain > Run Frequency-Domain Simulation

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