A General Method to Parameter Optimization for Highly Efficient Wireless Power Transfer

<pre>This paper proposes a new and general method to optimize a working frequency and a load resistance in order to realize highly efficient wireless power transfer. It should be noticed that neither resonant frequency nor matched impedance maximizes efficiency of wireless power transfer circuit, in general. This paper establishes a mathematical model of a commonly used wireless power transfer circuit, and derives a mathematical expression of circuit efficiency which involves a working frequency, a load resistance and the other parameters as symbols. This enables us to find the optimal working frequency and load resistance. The result of this paper is compared with results by a method based on resonance and impedance matching, and then clarified by a numerical example.</pre>

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A General Method to Parameter Optimization for Highly Efficient Wireless Power Transfer

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v6i6.10508 ◽

2016 ◽

Vol 6 (6) ◽

pp. 3217

Author(s):

Kazuya Yamaguchi ◽

Takuya Hirata ◽

Ichijo Hodaka

Keyword(s):

Impedance Matching ◽

Mathematical Expression ◽

Wireless Power Transfer ◽

Load Resistance ◽

Power Transfer ◽

Wireless Power ◽

Highly Efficient ◽

Working Frequency ◽

Matched Impedance ◽

General Method

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Design of Asymmetrical Relay Resonators for Maximum Efficiency of Wireless Power Transfer

International Journal of Antennas and Propagation ◽

10.1155/2016/8247476 ◽

2016 ◽

Vol 2016 ◽

pp. 1-8 ◽

Cited By ~ 12

Author(s):

Bo-Hee Choi ◽

Jeong-Hae Lee

Keyword(s):

Design Method ◽

Impedance Matching ◽

Wireless Power Transfer ◽

Load Resistance ◽

Maximum Efficiency ◽

Power Transfer ◽

Wireless Power ◽

Optimum Placement ◽

Power Transfer Efficiency ◽

Source Resistance

This paper presents a new design method of asymmetrical relay resonators for maximum wireless power transfer. A new design method for relay resonators is demanded because maximum power transfer efficiency (PTE) is not obtained at the resonant frequency of unit resonator. The maximum PTE for relay resonators is obtained at the different resonances of unit resonator. The optimum design of asymmetrical relay is conducted by both the optimum placement and the optimum capacitance of resonators. The optimum placement is found by scanning the positions of the relays and optimum capacitance can be found by using genetic algorithm (GA). The PTEs are enhanced when capacitance is optimally designed by GA according to the position of relays, respectively, and then maximum efficiency is obtained at the optimum placement of relays. The capacitance of the second resonator tonth resonator and the load resistance should be determined for maximum efficiency while the capacitance of the first resonator and the source resistance are obtained for the impedance matching. The simulated and measured results are in good agreement.

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