Load characterisation in high frequency IPT systems using Class EF switching waveforms
File(s)
Accepted version
Author(s)
Arteaga Saenz, Juan
Pucci, Nunzio
Lan, Lingxin
Mitcheson, Paul
Type
Journal Article
Abstract
This paper introduces a technique to calculate the induced voltage generated by coupled-receivers and foreign-objects on the transmit-coil in real-time. Changes in the position or electrical quantities of the receivers, and foreign-objects, alter the induced voltage on the transmit-coil, and with it the trajectory of the switching-waveforms of the inverter driving the transmit-coil. From the shape of these waveforms, information on the phase and amplitude of the induced voltage can be extracted, thus enabling the induced voltage on the primary to be estimated with a single, easy to access, voltage measurement, which is easier than estimating the induced voltage from measurements of coil current and total coil-voltage. We used a support-vector-machine(SVM) to perform regression analysis on the drain-voltage data. The experimental setup uses a 100W, 13.56MHz Class-EF inverter, and the model was generated from a large number of samples of the drain-voltage waveforms operating at different known loads. These were generated from our in house HF-IPT test-load, which uses a Class-EF synchronous rectifier. The results allow the induced voltage on the transmit-coil to be estimated in real time from the drain-voltage waveform alone, with a normalised root-mean-square error of 1.1% for the real part~(reflected resistance) and 1.2% for the imaginary part~(reflected reactance).
Date Issued
2021-10
Date Acceptance
2021-04-17
Citation
IEEE Transactions on Power Electronics, 2021, 36 (10), pp.11036-11044
ISSN
0885-8993
Publisher
Institute of Electrical and Electronics Engineers
Start Page
11036
End Page
11044
Journal / Book Title
IEEE Transactions on Power Electronics
Volume
36
Issue
10
Copyright Statement
© 2021 The Authors. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
License URL
Sponsor
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Natural Environment Research Council (NERC)
Engineering & Physical Science Research Council (E
Identifier
https://ieeexplore.ieee.org/document/9410382
Grant Number
Ref: R122041-101/86440
73719 (EP/R029504/1)
NE/T011467/1
EP/R511547/1
Subjects
Electrical & Electronic Engineering
0906 Electrical and Electronic Engineering
Publication Status
Published
Date Publish Online
2021-04-21