scholarly journals Gain expressions for resonant inductive wireless power transfer links with one relay element

2017 ◽  
Vol 5 (1) ◽  
pp. 27-41 ◽  
Author(s):  
Franco Mastri ◽  
Mauro Mongiardo ◽  
Giuseppina Monti ◽  
Marco Dionigi ◽  
Luciano Tarricone
Keyword(s):  
Practical Interest ◽  
Theoretical Data ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Network Behavior ◽  
Wireless Power ◽  
Figures Of Merit ◽  
Relay Element ◽  
Single Relay ◽  
Analytical Expressions

In this paper, a resonant inductive wireless power transfer link using a relay element is analyzed. Different problems of practical interest are considered and solved by modeling the link as a lossy two-port network. According to the two-port network formalism, the standard gain definition (i.e. the power, the available, and the transducer gains) are used for describing the network behavior. Firstly, the case of a link with given parameters is considered and the analytical expressions of the optimal terminating impedances for maximizing the link gains are derived. Later on, the case of a link with given source and load is analyzed and the possibility of maximizing the performance by acting either on the transmitting or on the receiving side is investigated. It is shown that by using a single relay element, it is not always possible to maximize all the figures of merit that could be of interest in the WPT context. Theoretical data are validated by comparisons with circuital simulation results.

scholarly journals Gain Expressions for Capacitive Wireless Power Transfer with One Electric Field Repeater

Electronics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 723
Author(s):  
Ben Minnaert ◽  
Giuseppina Monti ◽  
Alessandra Costanzo ◽  
Mauro Mongiardo
Keyword(s):  
Wireless Power Transfer ◽  
Active Networks ◽  
Internal Source ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Analytical Formulas ◽  
Coupling Factors ◽  
Wireless Power Transfer System ◽  
Analytical Expressions

In this paper, the use of a repeater element between the transmitter and the receiver of a capacitive wireless power transfer system for achieving larger transfer distances is analyzed. A network formalism is adopted and the performance described by using the three power gains usually adopted in the context of two-port active networks. The analytical expressions of the gains as function of the network elements are derived. Assuming that the parameters of the link are given and fixed, including the coupling factors between transmitter, repeater and receiver, the conditions for maximizing the different gains by acting on the network terminating impedances (i.e., load and internal source conductance) are determined. The analytical formulas are verified through circuital simulations.

scholarly journals Wireless power transfer between one transmitter and two receivers: optimal analytical solution

2016 ◽  
Vol 3 (1) ◽  
pp. 63-73 ◽  
Author(s):  
Giuseppina Monti ◽  
Wenquan Che ◽  
Qinghua Wang ◽  
Marco Dionigi ◽  
Mauro Mongiardo ◽  
...  
Keyword(s):  
Analytical Procedure ◽  
Theoretical Data ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Maximum Power ◽  
Maximum Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Optimal Range ◽  
Or Efficiency

This paper focuses on non-radiative wireless power transfer implemented by means of a resonant magnetic coupling. The case of one transmitter and two receivers is considered and a rigorous analytical procedure is developed demonstrating that maximum power transfer or maximum efficiency can be achieved by appropriately selecting the load values. Both cases of coupled and uncoupled receivers are solved; closed formulas are derived for the optimal loads, which maximize either power or efficiency. It is shown that the resistances that realize maximum power transfer are always greater than the resistances that realize maximum efficiency. According to this observation, an optimal range of operation for the load resistances is also determined. Furthermore, it is demonstrated that in the case where the receivers are coupled the introduction of appropriate compensating reactances allows retrieving the same results corresponding to the uncoupled case both for powers and efficiency. Theoretical data are validated by comparisons with numerical results.

scholarly journals Optimal single relay position of a 3-coil wireless power transfer system

2016 ◽  
Vol 2016 (7) ◽  
pp. 249-252
Author(s):  
Wangqiang Niu ◽  
Jianhua Wang ◽  
Jianxin Chu ◽  
Wei Gu
Keyword(s):  
Wireless Power Transfer ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Wireless Power Transfer System ◽  
Single Relay

Scaling Law of Coupling Coefficient and Coil Size in Wireless Power Transfer Design via Magnetic Coupling

2017 ◽  
Vol 137 (4) ◽  
pp. 326-333
Author(s):  
Chiaki Nagai ◽  
Kenji Inukai ◽  
Masato Kobayashi ◽  
Tatsuya Tanaka ◽  
Kensho Abumi ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Scaling Law ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Coil Size
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