scholarly journals Optimum Receiver-Side Tuning Capacitance for Capacitive Wireless Power Transfer

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1543
Author(s):  
Sungryul Huh ◽  
Dukju Ahn
Keyword(s):  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Operating Frequency ◽  
Transfer System ◽  
Power Transfer ◽  
Receiver Side ◽  
Wireless Power ◽  
Usual Convention ◽  
Optimum Receiver

This paper reveals the optimum capacitance value of a receiver-side inductor-capacitor (LC) network to achieve the highest efficiency in a capacitive power-transfer system. These findings break the usual convention of a capacitance value having to be chosen such that complete LC resonance happens at the operating frequency. Rather, our findings in this paper indicate that the capacitance value should be smaller than the value that forms the exact LC resonance. These analytical derivations showed that as the ratio of inductor impedance divided by plate impedance increased, the optimum Rx capacitance decreased. This optimum capacitance maximized the TX-to-RX transfer efficiency of a given set of system conditions, such as matching inductors and coupling plates.

scholarly journals Optimizing the wireless power transfer over MIMO Channels

2017 ◽  
Vol 15 ◽  
pp. 181-187 ◽  
Author(s):  
Karsten Wiedmann ◽  
Tobias Weber
Keyword(s):  
Wireless Power Transfer ◽  
Rayleigh Quotient ◽  
Transfer Efficiency ◽  
Mimo Channel ◽  
Power Transfer ◽  
Receiver Side ◽  
Wireless Power ◽  
Mimo Channels ◽  
Optimal Operating ◽  
Power Transfer Efficiency

Abstract. In this paper, the optimization of the power transfer over wireless channels having multiple-inputs and multiple-outputs (MIMO) is studied. Therefore, the transmitter, the receiver and the MIMO channel are modeled as multiports. The power transfer efficiency is described by a Rayleigh quotient, which is a function of the channel's scattering parameters and the incident waves from both transmitter and receiver side. This way, the power transfer efficiency can be maximized analytically by solving a generalized eigenvalue problem, which is deduced from the Rayleigh quotient. As a result, the maximum power transfer efficiency achievable over a given MIMO channel is obtained. This maximum can be used as a performance bound in order to benchmark wireless power transfer systems. Furthermore, the optimal operating point which achieves this maximum will be obtained. The optimal operating point will be described by the complex amplitudes of the optimal incident and reflected waves of the MIMO channel. This supports the design of the optimal transmitter and receiver multiports. The proposed method applies for arbitrary MIMO channels, taking transmitter-side and/or receiver-side cross-couplings in both near- and farfield scenarios into consideration. Special cases are briefly discussed in this paper in order to illustrate the method.

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