Receiver Characteristics Estimation from Transmitter-side Measurements in Wireless Power Transfer Systems
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Sähkötekniikan korkeakoulu |
Master's thesis
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Authors
Date
2021-12-13
Department
Major/Subject
Electrical Power and Energy Engineering
Mcode
ELEC3024
Degree programme
AEE - Master’s Programme in Automation and Electrical Engineering (TS2013)
Language
en
Pages
46
Series
Abstract
Wireless Power Transfer (WPT) systems have evolved from single transmitter (Tx) --- receiver (Rx) WPT systems to multi-transmitter (multi-Tx) --- multi-receiver (multi-Rx) devices. Multi-antenna configurations enable some spatial freedom for positioning receivers over a large area. For example, wireless charging solutions for autonomous vehicles benefit from such multi-Tx multi-Rx WPT systems. Although the multi-Tx and multi-Rx based WPT technology appears promising, it is not yet fully adopted by the industry. The main reason is that this technology still faces critical research challenges of free positioning, misalignment tolerance, and control of power sources. A lot of work has been done by the academia to tackle those burning issues for optimization of WPT systems. However, known solutions require additional sensors and data communication links between the transmitter and receiver, resulting in high complexity and cost. This thesis introduces a novel method of load modulation that provides a possibility to ``sense'' receiver's presence and location by measuring the transmitter current. Using the proposed technique, information about the load resistance and mutual inductance can be detected at the Tx-side and used to optimize the power transfer. In the thesis, We will explain the idea and present a successful implementation of a time-varying resistance using an active rectifier in the receiver.Description
Supervisor
Tretyakov, SergeiThesis advisor
Jayathurathnage, PrasadKeywords
wireless power transfer, load modulation, load resistance estimation, mutual inductance estimation, modulation frequency, multi-receivers and transmitters