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Modeling and Implementation of a New Non-contact Slip Ring for Wireless Power Transfer

The contact slip ring has the disadvantages of being easy to wear and short-circuit, and large-scale pot core is difficult to manufacture. To avoid these shortcomings, a new non-contact slip ring is designed for wireless power transfer. The slip ring uses the principle of inductive coupling power transfer (ICPT) to invert the DC signal into a set of complementary signals, then transfer the power through a custom core and coil, and finally rectify the induced signal through the full bridge rectification on the secondary side. The mathematical model of the magnetizing inductance and leakage inductance of the slip ring are obtained through theoretical analysis, and the series-parallel (SP) capacitor combination is used to compensate the leakage inductance. Finally, the above method was verified by a prototype, and the efficiency can reach 80%, which means this slip ring has a good application prospect.