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This paper compares the electrical characteristics of S-P (Series - Parallel) type with those of a repeating coil type wireless power transfer (WPT) system. The features of the two types of WPT systems are described for same output power using a same coil model. In general, the misalignment of power transmitting and receiving coils causes an output power to decrease using resonance capacitors with large operations current and voltage. From the viewpoint, a compensation method for the misalignment is investigated to reduce this burden of the resonance capacitor. Simulation is made on electrical characteristics such as output power and power transfer efficiency of a proposed WPT system applied to automatic guided vehicle (AGV) based on an equipment circuit combining results of electromagnetic analysis. As a results, it is found that a repeating coil keeping the center position between the primary and secondary coils can suppress the burden of the resonance capacitor so as to improve the transmission power of WPT system.

Electrical Characteristics of Wireless Power Transfer System with Repeating Coil for AGV Considering the Misalignment of Coils