There is a leakage transformer (attachment 12) in a switching power supply based on resonance phenomenon.
I performed some tests for finding the circuit modeling of the transformer and the results are gathered in the attachments 11.
The nest step is to realize a mathematic model of the transformer. Hence, I will be able to simulate the circuit.
However, I haven’t found yet a reliable model for this type of transformer.
I would appreciate anyone could suggest me a reference or a solution in order to implement the model in MATLAB Simulink.
The schematic of the whole power supply switching was drawn in the attachment 13.
Sir, looking at your data, the measurement of the inductance from th secondary side with the primary terminals in short circuit seem suspect (too high) in comparison with the other measurements.
I think that you cannot get a reliable model at 30 kHz on the basis of 1 kHz measurements.
I suggest you to perform identification test by discharging a pre-charged capacitors on each winding with the other open and short circuited. The transformer parameters are obtained by elaborating the transient voltage and current in the winding. The value of the capacitor is selected to obtain the required oscillation frequency (say 30 kHz). You should limit the stray inductance of the capacitor set and that of the connection. The making device should have low losses and should not attempt to interrupt the high-frequency oscillating current.
Best regards, Giulio Santagostino
Giulio Santagostino
Thank you dear Prof. Santagostino for your kindly response.
You right, I should estimate the transformer in real condition. This procedure even was recommended by one of electrician prof in Shiraz university.
Nevertheless, I found a paper in which the same transformer used as mine and some of the parameters was reported. (Primary=120uH, mine: 109mH and Secondary: 28mH, mine: 23.17mH ) without something that pointed out about leakage values. (the paper was attached: table 1)
Furthermore, I calculated the other parameters based on my test and used some approximations. The report is in the attached 2.
Now, I would be grateful to look at them to see whether my approach is reliable or not.
I attach some sample calculations of the parameters of the transformer. I noticed some inconsistency in the input data you sent. I have still the opinion that for obtaining reliable 30kHz parameters you need specific measurements. You should also measure the voltage transformation ratio (open circuit) from both side as well the current transformation ratio (short circuit).
You should consider also the use of equivalent circuits alternative the one you used.
Best regards. Giulio Santagostino
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