Journal
IET POWER ELECTRONICS
Volume 6, Issue 9, Pages 1742-1750Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-pel.2012.0615
Keywords
air gaps; automotive electronics; battery chargers; battery powered vehicles; coils; finite element analysis; microwave power transmission; power semiconductor switches; zero voltage switching; electric stress; electric vehicle; zero voltage switching; air gap wireless charger; wireless power transfer system; battery charging; parallelaEuroparallel topology; resonance theory; finite element method; coil parameter extraction; on-board automotive electronics equipment; semiconductor switch; distance 10 cm to 15 cm; frequency 42 kHz; power 2 kW; voltage 200 V
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This study proposes a design and development of a wireless power transfer system to charge the battery in electric vehicles. A parallel-parallel topology is adopted to realise 10-15 cm-distance power transfer using the resonance theory. Finite-element method is used to extract the coil parameters. The advantages of the proposed design compared with the previous similar research are (i) low operational frequency (42 kHz) which avoids the electromagnetic interference to the on-board automotive electronics equipment and (ii) low electric stress to the semi-conductor switches through using zero-voltage-switching technique. A 2 kW prototype to charge 200 V battery was built to experimentally verify the theoretical analysis. The overall system efficiency is approximate to 86%.
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