Abstract：An accurate multi-winding high-frequency transformer equivalent circuit model is required to implement the circuit simulation of the power converter. The traditional multi-winding transformer star model not only has the oscillating problem caused by negative leakage inductance, but also has poor accuracy in simulating transient problems. The multi-winding transformer model based on duality principle is more accurate in simulating transient problems, but its topology is complex. It is difficult to determine model parameters based on port measurements information. In this paper, the magnetic field distribution of multi-winding transformers is analysed numerically. The dual model of multi-winding high-frequency transformers with alternating winding structure and its parameters are determined. An inductance determination method is proposed by observing the magnetic energy and magnetic flux of each reluctance in the magnetic circuit, and it makes the complex model topology no longer be limited by the port measurements information. The nonlinear reluctance in the magnetic circuit is determined by applying various excitation currents, and then the nonlinear inductance is obtained by conversion. The equivalent circuit model is compared with the polygon model and experimental results to verify the accuracy of the proposed model.
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2021, Vol. 36 
