Analysis and Simulation of Parasitic Parameters for PCB Planar Transformer

Three kinds of double sided PCB planar transformers are described in this paper: non-interleaving structure, part-interleaving structure and interleaving structure. The Magneto Motive Force (MMF) of the planar transformers with various structures is compared. The distribution of magnetic field intensity inside the transformers was verified by the Two Dimension Finite Element Analysis (FEA 2D). According to the relationship between the energy of leakage inductance and energy inside magnetic field, leakage inductance can be estimated. The parasitic capacitive effects and leakage inductance of various structures are simulated using software of Power Electronics Magnetics (PEmag). Finally, the interleaving structure with double secondary winding for the PCB planar transformer has been adopted to reduce the leakage inductance, and experiment is executed to compare the transformers with various structures described above.