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The paper proposes an improved transformer with an integrated magnetic circuit of the push-pull converter. For high-power server-type applications, the push-pull forward converter has been proven to have significantly better performance than the buck converter. This topology also provides a built-in input filter, and thus a smooth input current. All the magnetic components are integrated in a single core. The simulation of integrated magnetic and magnetic-circuit analysis identifies the proposed transformer correctly. Comparison is given of experimental results of discrete and integrated transformers.