In this paper, we argue that phased array WPT systems can
have advantages in terms of system efficiency and minimal
leakage fields if the phased array system is designed and implemented
properly. Proper design and implementation requires a
rigorous understanding of the circuits and controllable parameters
for a phased array WPT system. We provide a thorough
analysis of a generalized multiple transmitter, multiple receiver
phase-synchronized WPT system that can be used to quickly
simulate complex networks of wireless power transmitters and
receivers. We expand on this analysis and demonstrate simulation
results for three and four Tx coil phased arrayWPT systems.
The remainder of the paper focuses on a three-element system,
consisting of two Tx coils and one Rx coil. We define
critical parameters that allow the user to directly compute the
magnitude and phase that either maximizes or minimizes power
delivered to the load. After experimentally validating these equations
and simulation results, we highlight some additional capabilities
of a phased array WPT system in comparison to a
standard single Tx coil configuration. The adjacent phased array
configuration achieves highest system efficiency, which includes
the PA efficiency on the transmitter side and rectifier
efficiency on the receive side. However, the overlapping configuration
results in lowest leakage fields behind the Tx coils,
and consequently the highest FOM for the best balance between
high efficiency and lowleakage fields. Finally, we present a fully
autonomous system capable of adapting to variations in distance
between the Tx and Rx coils while automatically controlling the
magnitude and phase of the transmitter to maintain maximum
system efficiency.
In this paper, we argue that phased array WPT systems canhave advantages in terms of system efficiency and minimalleakage fields if the phased array system is designed and implementedproperly. Proper design and implementation requires arigorous understanding of the circuits and controllable parametersfor a phased array WPT system. We provide a thoroughanalysis of a generalized multiple transmitter, multiple receiverphase-synchronized WPT system that can be used to quicklysimulate complex networks of wireless power transmitters andreceivers. We expand on this analysis and demonstrate simulationresults for three and four Tx coil phased arrayWPT systems.The remainder of the paper focuses on a three-element system,consisting of two Tx coils and one Rx coil. We definecritical parameters that allow the user to directly compute themagnitude and phase that either maximizes or minimizes powerdelivered to the load. After experimentally validating these equationsand simulation results, we highlight some additional capabilitiesof a phased array WPT system in comparison to astandard single Tx coil configuration. The adjacent phased arrayconfiguration achieves highest system efficiency, which includesthe PA efficiency on the transmitter side and rectifierefficiency on the receive side. However, the overlapping configurationresults in lowest leakage fields behind the Tx coils,and consequently the highest FOM for the best balance betweenhigh efficiency and lowleakage fields. Finally, we present a fullyautonomous system capable of adapting to variations in distancebetween the Tx and Rx coils while automatically controlling themagnitude and phase of the transmitter to maintain maximumsystem efficiency.
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