Design and implementation of class-E power amplifiers and rectifiers for a dual-band capacitive wireless power transfer system
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Dadashzadeh, Hoda
issued: 2022-02-18T21:51:05Z
issued: 2022
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Wireless Power Transfer (WPT) system has the advantage of delivering power through a medium without using physical conductors to make an electrical connection. Two categories of WPT systems are Inductive Power Transfer (IPT) and Capacitive Power Transfer (CPT). In this thesis, the focus is on CPT. The work is motivated by challenges associated with obtaining efficient power transfer over relatively large gaps ranging from a few centimeters up to 20 cm. A dual-band CPT system is proposed that operates at frequencies of 13.56 MHz and 27.12 MHz. Depending on the gap distance, a specific frequency is selected. The primary focus in this research is the design of the high efficiency power amplifiers and rectifiers that are required to implement the dual-band system. The class-E circuit topology is selected for the designs. The theory of time-reversal duality is applied to convert the power amplifier circuits into synchronous rectifier circuits. The rectifier converts the Radio Frequency (RF) power to DC power and the rectification efficiency depends on load resistance. A variable load circuit board is implemented using a DC-DC power converter to track the maximum power efficiency of the rectifier. A buck converter is selected for the design and duty cycle is used to change the input resistance of the converter. In the last part of this work, the power amplifiers and the rectifiers are connected to a capacitive coupling network with an adjustable load resistance. The power and efficiency of the CPT system is simulated for gap distances ranging from 5 cm to 20 cm. Simulation results show that for maintaining high efficiency operation of the CPT the system, it needs to operate at 27.12 MHz for small gap separations and the frequency is switched to 13.56 MHz for larger gap separations.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/80858
note: Design and Implementation ofClass-E Power Amplifiersand Rectifiers for a Dual-BandCapacitive Wireless PowerTransfer SystembyHoda DadashzadehA THESIS SUBMITTED IN PARTIAL FULFILLMENT OFTHE REQUIREMENTS FOR THE DEGREE OFMASTER OF APPLIED SCIENCEinThe College of Graduate Studies(Electrical Engineering)THE UNIVERSITY OF BRITISH COLUMBIA(Okanagan)February 2022© Hoda Dadashzadeh 2022The following individuals certify that they have read, and recommendto the College of Graduate Studies for acceptance, a thesis/dissertation en-titled:Design and Implementation of Class-E Power Amplifiers andRectifiers for a Dual-Band Capacitive Wireless Power Trans-fer Systemsubmitted by Hoda Dadashzadeh in partial fulfilment of the requirementsof the degree of Master of Applied Science in Electrical Engineering.Dr. Thomas Johnson, Faculty of Applied ScienceSupervisorDr. Lo¨ıc Markley, Faculty of Applied ScienceSupervisory Committee MemberDr. Mohammad Hossein Zarifi, Faculty of Applied ScienceSupervisory Committee MemberDr. Alyse Hawley, Faculty of Applied ScienceUniversity ExamineriiAbstractWireless Power Transfer (WPT) system has the advantage of deliveringpower through a medium without using physical conductors to make anelectrical connection. Two categories of WPT systems are Inductive PowerTransfer (IPT) and Capacitive Power Transfer (CPT). In this thesis, thefocus is on CPT. The work is motivated by challenges associated with ob-taining efficient power transfer over relatively large gaps ranging from a fewcentimeters up to 20 cm.A dual-band CPT system is proposed that operates at frequencies of13.56 MHz and 27.12 MHz. Depending on the gap distance, a specific fre-quency is selected. The primary focus in this research is the design of thehigh efficiency power amplifiers and rectifiers that are required to implementthe dual-band system. The class-E circuit topology is selected for the de-signs. The theory of time-reversal duality is applied to convert the poweramplifier circuits into sync…
has type: Thesis/Dissertation
date issued: 2022-02
is shown at: 10.14288/1.0406624
language: eng
degree discipline: Electrical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Johnson, Thomas
type: Text
identifier URI: http://hdl.handle.net/2429/80858