Abstract
Abstract: Wireless power transfer scheme has become quite popular in recent times and used in various applications including consumer electronics, and electrical vehicle chargers. Although the power transfer scheme based on magnetic induction is knowledge, the relationship between efficiency of power transfer scheme with the ferrite core cross sectional area is not well understood. Surfaces with symmetrical ferrite core cross section area, will have good magnetic coupling while unsymmetrical cross-sectional surfaces with smaller overlap of magnetic flux, will suffer from high leakage inductance and excessive losses. Since majority of the wireless charging applications use non-uniform magnetic surfaces, the efficiency of real power transfer across primary and secondary windings tends to be lower and will require additional compensating circuitry or complex control algorithm. Unless a thorough understanding of leakage inductance is performed, wireless power topology will suffer from excessive resonant power circulation and output regulation will become unstable. Compensating circuit added at the secondary output can decrease overall reliability and increase BOM (Bill of material) cost. In this paper, wireless power transfer scheme is reviewed, and a theoretical model is provided. Analysis will be presented for various leakage inductances including the impact of operating frequency and line/load conditions
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