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The paper presents a set of systematic matrices performance, such as operation derived from Kirchhoff's Node Law with the base of a simple two-coil inductor model to deduce leakage conversion efficiency and electromagnetic interference inductances of windings seen from the schematic point of (EMI). In order to understand better the characteristics of view. This method provides a platform in calculating leakage transformer with different kinds of winding construction, a inductances of complex transformer structures. Its robustness simple robust method in a systematic way with accurate covers different kinds of concentric winding structures where estimation of leakage inductance is essential. Here we by getting accurate values of mutual inductances between all propose a method with the general characteristic of a combinations of winding elements in a pair-wise sense, transformer fully determined by a closed-form matrix accurate leakage inductances can be deduced through the without any simulations. Experimental results are provided to matrices operation without any computational simulations. In justify the accuracy of such matrices operations. essence, such operation reduces lots of difficult magnetic problems within a transformer into determination of mutual II. FUNDAMENTAL TRANSFORMER MODEL IN and self inductances of winding elements through a simple FREQUENCYDOMAIN two-coil inductor model. The approach has been implemented on PowerESIM [5] [6], a web base server type A. Definition of a Winding Element in a transformer power converter design program, for reader to test. A primary or secondary winding shown in the schematic level may consist of several winding portions in a physical transformer. An example is shown in Fig. 1 to demonstrate I.

In this paper a transformer construction technique is proposed that effectively cut off the Common Mode (CM) noise voltage passing across the isolated primary and secondary windings. This technique employs the Zero Equipotential Line theory to construct an anti-phase winding. It effectively cuts down CM noise by eliminating the noise voltage across the isolated primary and secondary windings. The concept of maintaining an equipotential line along the bobbin and quiet node connections are justified by analysis. A well considered transformer design with the proposed CM noise cancellation technique can achieve high conversion efficiency as well as good CM noise insulation.