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Special Issue "Wireless Power Transfer and Energy Harvesting Technologies"

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: closed (30 December 2017)

Special Issue Editors

Guest Editor
Prof. Dr. Aiguo Patrick Hu

The University of Auckland, New Zealand
Website | E-Mail
Interests: wireless power transfer technologies; energy harvesting; modelling and control of resonant power converters
Guest Editor
Prof. Dr. Xin Dai

Institute of power transfer technology, ChongQing University, China
Website | E-Mail
Interests: wireless power transfer systems; modelling and control of power electronic circuits
Guest Editor
Prof. Dr. Zhengming Zhao

Dept of Electrical Engineering, Tsinghua University, China
Website | E-Mail
Interests: high-power and high voltage power electronic technology; wireless power transfer.

Special Issue Information

Dear Colleagues,

We would like to invite you to submit your research findings to a Special Issue of Energies on the subject area of “Wireless Power Transfer and Energy Harvesting Systems”. This Special Issue will reflect the most recent theoretical and practical developments of wireless power supplies for consumer electronics, industrial, biomedical, and transportation applications. Topics to be included in this Special Issue include, but are not limited to, the following:

  • Wireless charging of mobile phones, pads, smart watches, etc.

  • Wireless charging of AGVs (Automatic Guided Vehicles), materials handling and logistic systems

  • Wireless power supply of biomedical sensors and actuators, heart pumps

  • Static and dynamic EVs charging

  • Wireless power transfer mechanism

  • System modelling and power flow control

  • Soft switching converter topologies

  • Magnetic coupling design

  • Capacitive coupling design

  • New ferrites and dielectric materials

  • Ultrasonic transducers for wireless power transfer

  • Energy harvesting technologies

  • Energy harvesting from high voltage power transmission lines

  • Wireless energy network

  • Energy management of battery and supercapacitor systems

  • Bi-directional wireless interface for PV and wind energy integration.

Assoc. Prof. Dr. Aiguo Patrick Hu
Prof. Dr. Xin Dai
Prof. Dr. Zhengming Zhao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Wireless power transfer (WPT)

  • Contactless power transfer

  • Inductive power transfer (IPT)

  • Capacitive power transfer (CPT)

  • Ultrasonic power transfer (UPT)

  • Batteries

  • Supercapacitors

  • Wireless charging

  • Transcutaneous energy transfer (TET)

  • Energy harvesting

  • Wireless integration of renewable energy

Published Papers (14 papers)

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Research

Jump to: Review

Open AccessArticle Design and Validation of a Control Algorithm for a SAE J2954-Compliant Wireless Charger to Guarantee the Operational Electrical Constraints
Energies 2018, 11(3), 604; https://doi.org/10.3390/en11030604
Received: 30 December 2017 / Revised: 28 February 2018 / Accepted: 5 March 2018 / Published: 9 March 2018
Cited by 3 | PDF Full-text (2508 KB) | HTML Full-text | XML Full-text
Abstract
Wireless power transfer is foreseen as a suitable technology to provide charge without cables to electric vehicles. This technology is mainly supported by two coupled coils, whose mutual inductance is sensitive to their relative positions. Variations on this coefficient greatly impact the electrical
[...] Read more.
Wireless power transfer is foreseen as a suitable technology to provide charge without cables to electric vehicles. This technology is mainly supported by two coupled coils, whose mutual inductance is sensitive to their relative positions. Variations on this coefficient greatly impact the electrical magnitudes of the wireless charger. The aim of this paper is the design and validation of a control algorithm for an Society of Automotive Engineers (SAE) J2954-compliant wireless charger to guarantee some operational and electrical constraints. These constraints are designed to prevent some components from being damaged by excessive voltage or current. This paper also presents the details for the design and implementation of the bidirectional charger topology in which the proposed controller is incorporated. The controller is installed on the primary and on the secondary side, given that wireless communication is necessary with the other side. The input data of the controller helps it decide about the phase shift required to apply in the DC/AC converter. The experimental results demonstrate how the system regulates the output voltage of the DC/AC converter so that some electrical magnitudes do not exceed predefined thresholds. The regulation, which has been tested when coil misalignments occur, is proven to be effective. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators
Energies 2018, 11(2), 453; https://doi.org/10.3390/en11020453
Received: 30 December 2017 / Revised: 5 February 2018 / Accepted: 9 February 2018 / Published: 20 February 2018
Cited by 1 | PDF Full-text (8154 KB) | HTML Full-text | XML Full-text
Abstract
Magnetic-resonant wireless power transfer (WPT) has become a reliable contactless source of power for a wide range of applications. WPT spans different power levels ranging from low-power implantable devices up to high-power electric vehicles (EV) battery charging. The transmission range and efficiency of
[...] Read more.
Magnetic-resonant wireless power transfer (WPT) has become a reliable contactless source of power for a wide range of applications. WPT spans different power levels ranging from low-power implantable devices up to high-power electric vehicles (EV) battery charging. The transmission range and efficiency of WPT have been reasonably enhanced by resonating the transmitter and receiver coils at a common frequency. Nevertheless, matching between resonance in the transmitter and receiver is quite cumbersome, particularly in single-transmitter multi-receiver systems. The resonance frequency in transmitter and receiver tank circuits has to be perfectly matched, otherwise power transfer capability is greatly degraded. This paper discusses the mistuning effect of parallel-compensated receivers, and thereof a novel dynamic frequency tuning method and related circuit topology and control is proposed and characterized in the system application. The proposed method is based on the concept of switch-mode gyrator emulating variable lossless inductors oriented to enable self-tunability in WPT receivers. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle A New ZVS Tuning Method for Double-Sided LCC Compensated Wireless Power Transfer System
Energies 2018, 11(2), 307; https://doi.org/10.3390/en11020307
Received: 31 December 2017 / Revised: 19 January 2018 / Accepted: 22 January 2018 / Published: 1 February 2018
PDF Full-text (7734 KB) | HTML Full-text | XML Full-text
Abstract
This paper presents a new zero voltage switching (ZVS) tuning method for the double-sided inductor/capacitor/capacitor (LCC) compensated wireless power transfer (WPT) system. An additional capacitor is added in the secondary side of the double-sided LCC compensation network in order to tune the network
[...] Read more.
This paper presents a new zero voltage switching (ZVS) tuning method for the double-sided inductor/capacitor/capacitor (LCC) compensated wireless power transfer (WPT) system. An additional capacitor is added in the secondary side of the double-sided LCC compensation network in order to tune the network to realize ZVS operation for the primary-side switches. With the proposed tuning method, the turn off current of the primary-side switches at the low input voltage range can be reduced compared with the previous ZVS tuning method. Consequently, the efficiency of the WPT at the low input voltage range is improved. Moreover, the relationship between the input voltage and the output power is more linear than that of the previous ZVS tuning method. In addition, the proposed method has a lower start-up voltage. The analysis and validity of the proposed tuning method are verified by simulation and experimental results. A WPT system with up to 3.5 kW output power is built, and 95.9% overall peak efficiency is achieved. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessFeature PaperArticle Study of Power Flow in an IPT System Based on Poynting Vector Analysis
Energies 2018, 11(1), 165; https://doi.org/10.3390/en11010165
Received: 7 November 2017 / Revised: 21 December 2017 / Accepted: 4 January 2018 / Published: 10 January 2018
Cited by 1 | PDF Full-text (1559 KB) | HTML Full-text | XML Full-text
Abstract
This paper analyzes the power distribution and flow of an inductive power transfer (IPT) system with two coupled coils by using the Poynting vector. The system is modelled with a current source flowing through the primary coil, and a uniformly loaded secondary first,
[...] Read more.
This paper analyzes the power distribution and flow of an inductive power transfer (IPT) system with two coupled coils by using the Poynting vector. The system is modelled with a current source flowing through the primary coil, and a uniformly loaded secondary first, then the Poynting vector at an arbitrary point is analyzed by calculating the magnetic and electric fields between and around of the two coils. Both analytical analysis and numerical analysis have been undertaken to show the power distribution, and it has found that power distributes as a donut shape in three-dimensional (3D) space and concentrates along the edges in the proposed two-coil setup, instead of locating coaxially along the center path. Furthermore, power flow across the mid-plane between the two coils is analyzed analytically by the surface integral of the Poynting vector, which is compared with the input power from the primary and the output power to the secondary coil via coupled circuit theory. It has shown that for a lossless IPT system, the power transferred across the mid-plane is equal to the input and output power, which validates the Poynting vector approach. The proposed Poynting vector method provides an effective way to analyze the power distribution in the medium between two coupled coils, which cannot be achieved by traditional lumped circuit theories. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle A Three-Phase Dynamic Wireless Charging System with Constant Output Voltage
Energies 2018, 11(1), 45; https://doi.org/10.3390/en11010045
Received: 7 November 2017 / Revised: 17 December 2017 / Accepted: 21 December 2017 / Published: 1 January 2018
Cited by 2 | PDF Full-text (5563 KB) | HTML Full-text | XML Full-text
Abstract
A dynamic wireless power transfer (WPT) system is an effective method, which can reduce charging time and extend the driving range of the electric vehicles. In the dynamic WPT systems, the output voltage may fluctuate when the receiver moves along the transmitter coils.
[...] Read more.
A dynamic wireless power transfer (WPT) system is an effective method, which can reduce charging time and extend the driving range of the electric vehicles. In the dynamic WPT systems, the output voltage may fluctuate when the receiver moves along the transmitter coils. This paper proposes a three-phase dynamic WPT charging system with overlapped three-phase transmitter coils. The overlap length is optimized to depress the fluctuation of the output voltage. These coils are powered by a three-phase inverter to generate an even magnetic field, and a unipolar coil is employed as a receiver to simplify the coil structure of the secondary side. Based on the proposed three-phase coil structure, the output voltage characteristics of the system are analyzed in detail. A 500 W dynamic charging prototype is established to validate the proposed dynamic charging system. Experimental results show that the output voltage fluctuation is within ±3.05%. The maximum system efficiency reaches 89.94%. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle Analysis of the Influence of Compensation Capacitance Errors of a Wireless Power Transfer System with SS Topology
Energies 2017, 10(12), 2177; https://doi.org/10.3390/en10122177
Received: 29 October 2017 / Revised: 13 December 2017 / Accepted: 14 December 2017 / Published: 19 December 2017
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Abstract
In this study, in order to determine the reasonable accuracy of the compensation capacitances satisfying the requirements on the output characteristics for a wireless power transfer (WPT) system, taking the series-series (SS) compensation structure as an example, the calculation formulas of the output
[...] Read more.
In this study, in order to determine the reasonable accuracy of the compensation capacitances satisfying the requirements on the output characteristics for a wireless power transfer (WPT) system, taking the series-series (SS) compensation structure as an example, the calculation formulas of the output characteristics, such as the power factor, output power, coil transfer efficiency, and capacitors’ voltage stress, are given under the condition of incomplete compensation according to circuit theory. The influence of compensation capacitance errors on the output characteristics of the system is then analyzed. The Taylor expansions of the theoretical formulas are carried out to simplify the formulas. The influence degrees of compensation capacitance errors on the output characteristics are calculated according to the simplified formulas. The reasonable error ranges of the compensation capacitances are then determined according to the requirements of the output characteristics of the system in the system design. Finally, the validity of the theoretical analysis and the simplified processing is verified through experiments. The proposed method has a certain guiding role for practical engineering design, especially in mass production. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle Combination of Compensations and Multi-Parameter Coil for Efficiency Optimization of Inductive Power Transfer System
Energies 2017, 10(12), 2088; https://doi.org/10.3390/en10122088
Received: 5 December 2017 / Revised: 5 December 2017 / Accepted: 6 December 2017 / Published: 8 December 2017
Cited by 2 | PDF Full-text (5339 KB) | HTML Full-text | XML Full-text
Abstract
A loosely coupled inductive power transfer (IPT) system for industrial track applications has been researched in this paper. The IPT converter using primary Inductor-Capacitor-Inductor (LCL) network and secondary parallel-compensations is analyzed combined coil design for optimal operating efficiency. Accurate mathematical analytical model and
[...] Read more.
A loosely coupled inductive power transfer (IPT) system for industrial track applications has been researched in this paper. The IPT converter using primary Inductor-Capacitor-Inductor (LCL) network and secondary parallel-compensations is analyzed combined coil design for optimal operating efficiency. Accurate mathematical analytical model and expressions of self-inductance and mutual inductance are proposed to achieve coil parameters. Furthermore, the optimization process is performed combined with the proposed resonant compensations and coil parameters. The results are evaluated and discussed using finite element analysis (FEA). Finally, an experimental prototype is constructed to verify the proposed approach and the experimental results show that the optimization can be better applied to industrial track distributed IPT system. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle Applicability of Compressive Sensing for Wireless Energy Harvesting Nodes
Energies 2017, 10(11), 1776; https://doi.org/10.3390/en10111776
Received: 30 September 2017 / Revised: 24 October 2017 / Accepted: 2 November 2017 / Published: 3 November 2017
PDF Full-text (813 KB) | HTML Full-text | XML Full-text
Abstract
This paper proposes an approach toward solving an issue pertaining to measuring compressible data in large-scale energy-harvesting wireless sensor networks with channel fading. We consider a scenario in which N sensors observe hidden phenomenon values, transmit their observations using amplify-and-forward protocol over fading
[...] Read more.
This paper proposes an approach toward solving an issue pertaining to measuring compressible data in large-scale energy-harvesting wireless sensor networks with channel fading. We consider a scenario in which N sensors observe hidden phenomenon values, transmit their observations using amplify-and-forward protocol over fading channels to a fusion center (FC), and the FC needs to choose a number of sensors to collect data and recover them according to the desired approximation error using the compressive sensing. In order to reduce the communication cost, sparse random matrices are exploited in the pre-processing procedure. We first investigate the sparse representation for sensors with regard to recovery accuracy. Then, we present the construction of sparse random projection matrices based on the fact that the energy consumption can vary across the energy harvesting sensor nodes. The key ingredient is the sparsity level of the random projection, which can greatly reduce the communication costs. The corresponding number of measurements is chosen according to the desired approximation error. Analysis and simulation results validate the potential of the proposed approach. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle An Impact-Based Frequency Up-Converting Hybrid Vibration Energy Harvester for Low Frequency Application
Energies 2017, 10(11), 1761; https://doi.org/10.3390/en10111761
Received: 23 September 2017 / Revised: 23 October 2017 / Accepted: 31 October 2017 / Published: 2 November 2017
Cited by 2 | PDF Full-text (5149 KB) | HTML Full-text | XML Full-text
Abstract
In this paper, a novel impact-based frequency up-converting hybrid energy harvester (FUCHEH) was proposed. It consisted of a piezoelectric cantilever beam and a driving beam with a magnetic tip mass. A solenoid coil was attached at the end of the piezoelectric beam. This
[...] Read more.
In this paper, a novel impact-based frequency up-converting hybrid energy harvester (FUCHEH) was proposed. It consisted of a piezoelectric cantilever beam and a driving beam with a magnetic tip mass. A solenoid coil was attached at the end of the piezoelectric beam. This innovative configuration amplified the relative motion velocity between magnet and coil, resulting in an enhancement of the induced electromotive force in the coil. An electromechanical coupling model was developed and a numerical simulation was performed to study the principle of impact-based frequency up-converting. A prototype was fabricated and experimentally tested. The time-domain and frequency-domain analyses were performed. Fast Fourier transform (FFT) analysis verified that fundamental frequencies and coupled vibration frequency contributes most of the output voltage. The measured maximum output power was 769.13 µW at a frequency of 13 Hz and an acceleration amplitude of 1 m/s2, which was 3249.4%- and 100.6%-times larger than that of the frequency up-converting piezoelectric energy harvesters (FUCPEH) and frequency up-converting electromagnetic energy harvester (FUCEMEH), respectively. The root mean square (RMS) voltage of the piezoelectric energy harvester subsystem (0.919 V) was more than 16 times of that of the stand-alone PEH (0.055 V). This paper provided a new scheme to improve generating performance of the vibration energy harvester with high resonant frequency working in the low-frequency vibration environment. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle A Maximum Power Transfer Tracking Method for WPT Systems with Coupling Coefficient Identification Considering Two-Value Problem
Energies 2017, 10(10), 1665; https://doi.org/10.3390/en10101665
Received: 4 September 2017 / Revised: 4 October 2017 / Accepted: 12 October 2017 / Published: 20 October 2017
Cited by 4 | PDF Full-text (3031 KB) | HTML Full-text | XML Full-text
Abstract
Maximum power transfer tracking (MPTT) is meant to track the maximum power point during the system operation of wireless power transfer (WPT) systems. Traditionally, MPTT is achieved by impedance matching at the secondary side when the load resistance is varied. However, due to
[...] Read more.
Maximum power transfer tracking (MPTT) is meant to track the maximum power point during the system operation of wireless power transfer (WPT) systems. Traditionally, MPTT is achieved by impedance matching at the secondary side when the load resistance is varied. However, due to a loosely coupling characteristic, the variation of coupling coefficient will certainly affect the performance of impedance matching, therefore MPTT will fail accordingly. This paper presents an identification method of coupling coefficient for MPTT in WPT systems. Especially, the two-value issue during the identification is considered. The identification approach is easy to implement because it does not require additional circuit. Furthermore, MPTT is easy to realize because only two easily measured DC parameters are needed. The detailed identification procedure corresponding to the two-value issue and the maximum power transfer tracking process are presented, and both the simulation analysis and experimental results verified the identification method and MPTT. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers
Energies 2017, 10(9), 1444; https://doi.org/10.3390/en10091444
Received: 24 August 2017 / Revised: 14 September 2017 / Accepted: 15 September 2017 / Published: 19 September 2017
Cited by 2 | PDF Full-text (957 KB) | HTML Full-text | XML Full-text
Abstract
Wireless power transfer from one transmitter to multiple receivers through inductive coupling is slowly entering the market. However, for certain applications, capacitive wireless power transfer (CWPT) using electric coupling might be preferable. In this work, we determine closed-form expressions for a CWPT system
[...] Read more.
Wireless power transfer from one transmitter to multiple receivers through inductive coupling is slowly entering the market. However, for certain applications, capacitive wireless power transfer (CWPT) using electric coupling might be preferable. In this work, we determine closed-form expressions for a CWPT system with one transmitter and two receivers. We determine the optimal solution for two design requirements: (i) maximum power transfer, and (ii) maximum system efficiency. We derive the optimal loads and provide the analytical expressions for the efficiency and power. We show that the optimal load conductances for the maximum power configuration are always larger than for the maximum efficiency configuration. Furthermore, it is demonstrated that if the receivers are coupled, this can be compensated for by introducing susceptances that have the same value for both configurations. Finally, we numerically verify our results. We illustrate the similarities to the inductive wireless power transfer (IWPT) solution and find that the same, but dual, expressions apply. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle New Insight of Maximum Transferred Power by Matching Capacitance of a Wireless Power Transfer System
Energies 2017, 10(5), 688; https://doi.org/10.3390/en10050688
Received: 16 February 2017 / Revised: 9 May 2017 / Accepted: 11 May 2017 / Published: 13 May 2017
Cited by 6 | PDF Full-text (3165 KB) | HTML Full-text | XML Full-text
Abstract
Most research on wireless power transfer (WPT) has been focused on how to achieve a high-efficiency power transfer. Our study found that under the impedance matching for achieving maximum WPT efficiency, the power transferred to the load cannot reach the maximum when a
[...] Read more.
Most research on wireless power transfer (WPT) has been focused on how to achieve a high-efficiency power transfer. Our study found that under the impedance matching for achieving maximum WPT efficiency, the power transferred to the load cannot reach the maximum when a WPT system is supplied by an AC voltage source with constant amplitude. However, the load power or the voltage across the load is essential for a low-power electric device such as the implanted medical device where the transfer efficiency is not the priority to be considered. The paper presents a method for achieving maximum power on the load by matching capacitance in a WPT system with given two-coupled-coils. Three sets of matching capacitances for extreme load power were deduced based on the circuit model considering the coil's resistance, and all these three matching make the WPT system operate at the resonant state. Two sets can make the system achieve the global maximum of load power. One set can make the system achieve the local maximum of load power and reach the power transfer efficiency next to 1. Experimental results verified the theoretical calculations. The results can contribute to the compensation design of a practical WPT system for transferring the maximum power to the load. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Open AccessArticle A Short-Current Control Method for Constant Frequency Current-Fed Wireless Power Transfer Systems
Energies 2017, 10(5), 585; https://doi.org/10.3390/en10050585
Received: 24 February 2017 / Revised: 15 April 2017 / Accepted: 20 April 2017 / Published: 25 April 2017
PDF Full-text (7592 KB) | HTML Full-text | XML Full-text
Abstract
Frequency drift is a serious problem in Current-Fed Wireless Power Transfer (WPT) systems. When the operating frequency is drifting from the inherent Zero Voltage Switching (ZVS) frequency of resonant network, large short currents will appear and damage the switches. In this paper, an
[...] Read more.
Frequency drift is a serious problem in Current-Fed Wireless Power Transfer (WPT) systems. When the operating frequency is drifting from the inherent Zero Voltage Switching (ZVS) frequency of resonant network, large short currents will appear and damage the switches. In this paper, an inductance-dampening method is proposed to inhibit short currents and achieve constant-frequency operation. By adding a small auxiliary series inductance in the primary resonant network, short currents are greatly attenuated to a safe level. The operation principle and steady-state analysis of the system are provided. An overlapping time self-regulating circuit is designed to guarantee ZVS running. The range of auxiliary inductances is discussed and its critical value is calculated exactly. The design methodology is described and a design example is presented. Finally, a prototype is built and the experimental results verify the proposed method. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Review

Jump to: Research

Open AccessReview A Review on the Recent Development of Capacitive Wireless Power Transfer Technology
Energies 2017, 10(11), 1752; https://doi.org/10.3390/en10111752
Received: 17 October 2017 / Revised: 30 October 2017 / Accepted: 30 October 2017 / Published: 1 November 2017
Cited by 3 | PDF Full-text (5618 KB) | HTML Full-text | XML Full-text
Abstract
Capacitive power transfer (CPT) technology is an effective and important alternative to the conventional inductive power transfer (IPT). It utilizes high-frequency electric fields to transfer electric power, which has three distinguishing advantages: negligible eddy-current loss, relatively low cost and weight, and excellent misalignment
[...] Read more.
Capacitive power transfer (CPT) technology is an effective and important alternative to the conventional inductive power transfer (IPT). It utilizes high-frequency electric fields to transfer electric power, which has three distinguishing advantages: negligible eddy-current loss, relatively low cost and weight, and excellent misalignment performance. In recent years, the power level and efficiency of CPT systems has been significantly improved and has reached the power level suitable for electric vehicle charging applications. This paper reviews the latest developments in CPT technology, focusing on two key technologies: the compensation circuit topology and the capacitive coupler structure. The comparison with the IPT system and some critical issues in practical applications are also discussed. Based on these analyses, the future research direction can be developed and the applications of the CPT technology can be promoted. Full article
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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