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Wireless power transfer (WPT) technology are hot topic in current researches in SMPS. This paper focuses on the structure of magnetic coupling system, which regarded as the most significant part in WPT system. A new magnetic structure with good position robust and low flux leakage to nearby space was proposed comparing to the traditional spiral structure. The simulation results, magnetic evaluation results and test results verified the proposed magnetic structure is more suitable for the cases in which the receive devices could offset horizontally.

The prediction technology of the conducted EMI of SMPS is an effective way to reduce the EMI debug period and costs. The traditional prediction technology mainly focused on the self-model of the component and paid little attention to the electromagnetic coupling between the components in SMPS. This paper proposed an optimal prediction method with near-filed electromagnetic coupling parameters in which the electromagnetic coupling parameters are got by HFSS simulation or test results. Finally, the consistency between the prediction result and the prototype test result of the conducted EMI verifies the optimal prediction method to be correct and flexible.