Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 7, Pages 4809-4817Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2483839
Keywords
Energy efficiency; mutual inductance coupling; U-coil; wireless power transfer (WPT)
Categories
Funding
- National High Technology Research and Development Program of China (863 Program) [2015AA010402]
- National Natural Science Foundation of China [51277192, 51377183, 51207173]
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In order to improve the power transfer efficiency and ensure the space cleanliness of power transfer direction in inductive coupled wireless power transfer (WPT) system, a new U-coil WPT system is proposed. Based on the mutual inductance coupling theory, a new methodology for ensuring that a U-coil system is more energy efficient than a two-coil counterpart is presented in this paper. The theoretical proof and the conditions for meeting the objective are derived and practically verified in a practical prototype. The experimental results show: 1) comparing with two-coil system, power transfer efficiency can be improved more than ten times by using U-coil system; and 2) with the same power transfer efficiency principle, the dimension of primary and load coils in U-coil system shrinks at least 66% comparing with that of two-coil system. The U-coil system not only improves power transfer efficiency but also ensures the cleanliness of the space along the energy transfer direction.
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