The Experts below are selected from a list of 9060 Experts worldwide ranked by ideXlab platform
Mauro Feliziani - One of the best experts on this subject based on the ideXlab platform.
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magnetic field mitigation by multiCoil active shielding in electric vehicles equipped with wireless power charging system
IEEE Transactions on Electromagnetic Compatibility, 2020Co-Authors: Tommaso Campi, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:A novel design of active Coil shielding is proposed to reduce the magnetic field generated by the currents flowing into the Coils of a wireless power transfer (WPT) system for charging the batteries of an electric vehicle (EV). The main idea is to divide the traditional active loop used to shield a source in two separate shielding Coils so as not to adversely affect the WPT performance. This concept is applied to shield the WPT Coils, and, therefore, in the proposed design, there are active Coils placed on the ground parallel to the Primary Coil of the WPT and some others on board below the vehicle, planarly located with the secondary Coil. The currents on the active Coils are optimized in order to minimize the magnetic field in the most critical zone accessible from humans, i.e., region besides the EV and in the cabin.
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active Coil system for magnetic field reduction in an automotive wireless power transfer system
International Symposium on Electromagnetic Compatibility, 2019Co-Authors: Tommaso Campi, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:A novel design of active Coils is proposed to reduce the magnetic field generated by the currents flowing into the Coils of a wireless power transfer (WPT) system for recharging the batteries of an electric vehicle (EV). The main idea is to split the traditional active loop, in two separate shielding Coils. They have semi-annular shape and are placed on the ground pad around the WPT Primary Coil. The geometry and excitation of the active Coils are varied to minimize the magnetic field beside the active Coils without degrading the WPT electrical performance.
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feasibility study of a wireless power transfer system applied to a leadless pacemaker
IEEE Wireless Power Transfer Conference, 2018Co-Authors: Tommaso Campi, V De Santis, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:This study deals with the battery recharge of a leadless pacemaker, which has been recently introduced in the market, by means of the wireless power transfer (WPT) technology based on the magnetic resonant coupling. The main difficulty is given by the depth of the leadless pacemaker implantation inside the human body. The electromagnetic problem mainly consists in the selection of the on-body excitation (Primary Coil current and frequency), which must adequately energize the leadless pacemaker without any exceedance of the basic restrictions (BRs) specified by the electromagnetic field (EMF) safety standards. Another relevant problem consists in the weight of the leadless pacemaker within the secondary Coil that must be very light. In this paper, a feasibility study is carried out to define possible solutions for this kind of application.
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High efficiency and lightweight wireless charging system for drone batteries
2017 AEIT International Annual Conference, 2017Co-Authors: T. Campi, Silvano Cruciani, Mauro Feliziani, Fernanda MaradeiAbstract:A high power and high efficiency Wireless Power Transfer (WPT) system based on magnetic resonant coupling is proposed to automatically recharge the battery of a small Unmanned Aerial Vehicle (UAV) (a remotely controlled drone). The drone is equipped with a WPT receiving (Rx) circular Coil with an electronic system to control the battery charging process, while the WPT transmitting (Tx) circular Coil is placed on a ground station and connected to the electric power feeding system. To improve the electrical performance and the tolerance to always possible misalignments between Rx and Tx Coils, the Primary Coil is placed on a 2-axes motorized positioning system suitable to achieve a quite perfect alignment. This aspect is very important in the application of the WPT technology to drones due to the poor precision of the landing systems.
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emf safety and thermal aspects in a pacemaker equipped with a wireless power transfer system working at low frequency
IEEE Transactions on Microwave Theory and Techniques, 2016Co-Authors: Tommaso Campi, Silvano Cruciani, Valerio De Santis, Mauro FelizianiAbstract:A wireless power transfer (WPT) system based on magnetic resonant coupling is applied to a pacemaker for recharge its battery. The Primary Coil is assumed to be on-body, while the secondary Coil is in-body. Three different configurations of the secondary Coil are hereby investigated placing it inside the titanium case of the pacemaker, on the top surface of the case, or being part of the top surface case. The operational frequency is fixed to be at a relatively low frequency (20 kHz) in order to allow field penetration through the case and to limit the electric and magnetic field safety and thermal increase issues. For each examined configuration, these aspects are investigated by numerical and experimental techniques. The obtained results demonstrate the feasibility of the proposed solutions highlighting their advantages and disadvantages.
James F Whidborne - One of the best experts on this subject based on the ideXlab platform.
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state space modeling of a class bf e bf 2 converter for inductive links
IEEE Transactions on Power Electronics, 2015Co-Authors: P C K Luk, Samer Aldhaher, Weizhong Fei, James F WhidborneAbstract:This paper presents a state-space-based analysis of a Class $\hbox{E}^2$ converter for wireless power systems based on a two-Coil inductive link. The Class $\hbox{E}^2$ converter consists of a 200-kHz Class E inverter as the Primary Coil driver and a voltage-driven Class E synchronous rectifier at the secondary Coil of the inductive link. A piecewise linear seventh-order state-space model is used to calculate several parameters and values to achieve optimum switching operation of the Class E inverter and the Class E rectifier. Simulation results are presented to compare the accuracy of the state-space modeling approach with the established analytical approach. For validation of the state-space analysis, an investigation of the influence of variation of Coil alignment and load for a 20-W Class $\hbox{E}^2$ converter prototype system is performed by means of a novel compensation method that maintains optimum switching conditions irrespective of variations. Experimental results are presented to confirm the accuracy of the state-space modeling approach over a wide range of operational conditions and the utility of the compensation method.
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electronic tuning of misaligned Coils in wireless power transfer systems
IEEE Transactions on Power Electronics, 2014Co-Authors: Samer Aldhaher, P C K Luk, James F WhidborneAbstract:The misalignment and displacement of inductively coupled Coils in a wireless power transfer system (WPT) can degrade the power efficiency and limit the amount of power that can be transferred. Coil misalignment leads the Primary Coil driver to operate in an untuned state which causes nonoptimum switching operation and results in an increase in switching losses. This paper presents a novel method to electronically tune a Class-E inverter used as a Primary Coil driver in an inductive WPT system to minimize the detrimental effects of misalignment between the inductively coupled Coils which may occur during operation. The tuning method uses current-controlled inductors (saturable reactors) and a variable switching frequency to achieve optimum switching conditions regardless of the misalignment. Mathematical analysis is performed on a Class-E inverter based on an improved model of a resonant inductive link. Experimental results are presented to confirm the analysis approach and the suitability of the proposed tuning method.
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electronic tuning of misaligned Coils in wireless power transfer systems
IEEE Transactions on Power Electronics, 2014Co-Authors: Samer Aldhaher, James F WhidborneAbstract:The misalignment and displacement of inductively coupled Coils in a wireless power transfer system (WPT) can degrade the power efficiency and limit the amount of power that can be transferred. Coil misalignment leads the Primary Coil driver to operate in an untuned state which causes non-optimum switching operation and results in an increase in switching losses. This paper presents a novel method to electronically tune a Class E inverter used as a Primary Coil driver in an inductive WPT system to minimize the detrimental effects of misalignment between the inductively coupled Coils which may occur during operation. The tuning method uses current controlled inductors (saturable reactors) and a variable switching frequency to achieve optimum switching conditions regardless of the misalignment. Mathematical analysis is performed on a Class E inverter based on an improved model of a resonant inductive link. Experimental results are presented to confirm the analysis approach and the suitability of the proposed tuning method. Index Terms—Inductive power transmission, Coupling circuits, Resonant inverters, Tunable circuits and devices inductive link. A numerical solution is presented to calculate the values of the Class E inverter's parameters to be con- trolled as the coupling coefficient of the inductive link varies. Section IV discusses the use of saturable reactors as tuning elements and the key design aspects. Section V describes an implemented WPT system, the principle of operation of the electronic tuning method is discussed and extensive results based on experimental measurements are presented. Finally, Section VI includes the conclusion and future work.
Tommaso Campi - One of the best experts on this subject based on the ideXlab platform.
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magnetic field mitigation by multiCoil active shielding in electric vehicles equipped with wireless power charging system
IEEE Transactions on Electromagnetic Compatibility, 2020Co-Authors: Tommaso Campi, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:A novel design of active Coil shielding is proposed to reduce the magnetic field generated by the currents flowing into the Coils of a wireless power transfer (WPT) system for charging the batteries of an electric vehicle (EV). The main idea is to divide the traditional active loop used to shield a source in two separate shielding Coils so as not to adversely affect the WPT performance. This concept is applied to shield the WPT Coils, and, therefore, in the proposed design, there are active Coils placed on the ground parallel to the Primary Coil of the WPT and some others on board below the vehicle, planarly located with the secondary Coil. The currents on the active Coils are optimized in order to minimize the magnetic field in the most critical zone accessible from humans, i.e., region besides the EV and in the cabin.
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active Coil system for magnetic field reduction in an automotive wireless power transfer system
International Symposium on Electromagnetic Compatibility, 2019Co-Authors: Tommaso Campi, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:A novel design of active Coils is proposed to reduce the magnetic field generated by the currents flowing into the Coils of a wireless power transfer (WPT) system for recharging the batteries of an electric vehicle (EV). The main idea is to split the traditional active loop, in two separate shielding Coils. They have semi-annular shape and are placed on the ground pad around the WPT Primary Coil. The geometry and excitation of the active Coils are varied to minimize the magnetic field beside the active Coils without degrading the WPT electrical performance.
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feasibility study of a wireless power transfer system applied to a leadless pacemaker
IEEE Wireless Power Transfer Conference, 2018Co-Authors: Tommaso Campi, V De Santis, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:This study deals with the battery recharge of a leadless pacemaker, which has been recently introduced in the market, by means of the wireless power transfer (WPT) technology based on the magnetic resonant coupling. The main difficulty is given by the depth of the leadless pacemaker implantation inside the human body. The electromagnetic problem mainly consists in the selection of the on-body excitation (Primary Coil current and frequency), which must adequately energize the leadless pacemaker without any exceedance of the basic restrictions (BRs) specified by the electromagnetic field (EMF) safety standards. Another relevant problem consists in the weight of the leadless pacemaker within the secondary Coil that must be very light. In this paper, a feasibility study is carried out to define possible solutions for this kind of application.
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emf safety and thermal aspects in a pacemaker equipped with a wireless power transfer system working at low frequency
IEEE Transactions on Microwave Theory and Techniques, 2016Co-Authors: Tommaso Campi, Silvano Cruciani, Valerio De Santis, Mauro FelizianiAbstract:A wireless power transfer (WPT) system based on magnetic resonant coupling is applied to a pacemaker for recharge its battery. The Primary Coil is assumed to be on-body, while the secondary Coil is in-body. Three different configurations of the secondary Coil are hereby investigated placing it inside the titanium case of the pacemaker, on the top surface of the case, or being part of the top surface case. The operational frequency is fixed to be at a relatively low frequency (20 kHz) in order to allow field penetration through the case and to limit the electric and magnetic field safety and thermal increase issues. For each examined configuration, these aspects are investigated by numerical and experimental techniques. The obtained results demonstrate the feasibility of the proposed solutions highlighting their advantages and disadvantages.
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wireless power transfer charging system for aimds and pacemakers
IEEE Transactions on Microwave Theory and Techniques, 2016Co-Authors: Tommaso Campi, V De Santis, Silvano Cruciani, F Palandrani, Akimasa Hirata, Mauro FelizianiAbstract:This paper deals with the electric and magnetic field (EMF) safety aspects of a wireless power transfer (WPT) system based on magnetic resonant coupling between two Coils. The Primary Coil is assumed to be on-body, while the secondary Coil is assumed to be inside the human body and connected to a battery recharge system of an active implantable medical device such as a pacemaker. This study allows us to identify a good preliminary solution of the WPT Coil configuration, compensation capacitor topology, and operational frequency. Demonstrative WPT systems operating at two different frequencies are proposed in order to verify the WPT performances. The EMF safety has been finally assessed by numerical dosimetry studies using anatomically realistic human body models revealing no particular concerns about this application.
Samer Aldhaher - One of the best experts on this subject based on the ideXlab platform.
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Load-independent Class EF inverters for inductive wireless power transfer
2016 IEEE Wireless Power Transfer Conference WPTC 2016, 2016Co-Authors: Samer Aldhaher, Paul D. Mitcheson, David C. YatesAbstract:This paper will present the modelling, analysis and design of a load-independent Class EF inverter. This inverter is able to maintain zero-voltage switching (ZVS) operation and produce a constant output current for any load value without the need for tuning or replacement of components. The load- independent feature of this inverter is beneficial when used as the Primary Coil driver in multi-megahertz high power inductive wireless power transfer (WPT) applications where the distance between the Coils and the load are variable. The work here begins with the traditional load-dependent Class EF topology for inversion and then specifies the criteria that are required to be met in order achieve load-independence. The design and development of a 240W load-independent Class EF inverter to drive the Primary Coil of a 6.78MHz WPT system will be discussed and experimental results will be presented to show the load-independence feature when the distance between the Coils of the WPT system changes. A.
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state space modeling of a class bf e bf 2 converter for inductive links
IEEE Transactions on Power Electronics, 2015Co-Authors: P C K Luk, Samer Aldhaher, Weizhong Fei, James F WhidborneAbstract:This paper presents a state-space-based analysis of a Class $\hbox{E}^2$ converter for wireless power systems based on a two-Coil inductive link. The Class $\hbox{E}^2$ converter consists of a 200-kHz Class E inverter as the Primary Coil driver and a voltage-driven Class E synchronous rectifier at the secondary Coil of the inductive link. A piecewise linear seventh-order state-space model is used to calculate several parameters and values to achieve optimum switching operation of the Class E inverter and the Class E rectifier. Simulation results are presented to compare the accuracy of the state-space modeling approach with the established analytical approach. For validation of the state-space analysis, an investigation of the influence of variation of Coil alignment and load for a 20-W Class $\hbox{E}^2$ converter prototype system is performed by means of a novel compensation method that maintains optimum switching conditions irrespective of variations. Experimental results are presented to confirm the accuracy of the state-space modeling approach over a wide range of operational conditions and the utility of the compensation method.
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electronic tuning of misaligned Coils in wireless power transfer systems
IEEE Transactions on Power Electronics, 2014Co-Authors: Samer Aldhaher, P C K Luk, James F WhidborneAbstract:The misalignment and displacement of inductively coupled Coils in a wireless power transfer system (WPT) can degrade the power efficiency and limit the amount of power that can be transferred. Coil misalignment leads the Primary Coil driver to operate in an untuned state which causes nonoptimum switching operation and results in an increase in switching losses. This paper presents a novel method to electronically tune a Class-E inverter used as a Primary Coil driver in an inductive WPT system to minimize the detrimental effects of misalignment between the inductively coupled Coils which may occur during operation. The tuning method uses current-controlled inductors (saturable reactors) and a variable switching frequency to achieve optimum switching conditions regardless of the misalignment. Mathematical analysis is performed on a Class-E inverter based on an improved model of a resonant inductive link. Experimental results are presented to confirm the analysis approach and the suitability of the proposed tuning method.
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electronic tuning of misaligned Coils in wireless power transfer systems
IEEE Transactions on Power Electronics, 2014Co-Authors: Samer Aldhaher, James F WhidborneAbstract:The misalignment and displacement of inductively coupled Coils in a wireless power transfer system (WPT) can degrade the power efficiency and limit the amount of power that can be transferred. Coil misalignment leads the Primary Coil driver to operate in an untuned state which causes non-optimum switching operation and results in an increase in switching losses. This paper presents a novel method to electronically tune a Class E inverter used as a Primary Coil driver in an inductive WPT system to minimize the detrimental effects of misalignment between the inductively coupled Coils which may occur during operation. The tuning method uses current controlled inductors (saturable reactors) and a variable switching frequency to achieve optimum switching conditions regardless of the misalignment. Mathematical analysis is performed on a Class E inverter based on an improved model of a resonant inductive link. Experimental results are presented to confirm the analysis approach and the suitability of the proposed tuning method. Index Terms—Inductive power transmission, Coupling circuits, Resonant inverters, Tunable circuits and devices inductive link. A numerical solution is presented to calculate the values of the Class E inverter's parameters to be con- trolled as the coupling coefficient of the inductive link varies. Section IV discusses the use of saturable reactors as tuning elements and the key design aspects. Section V describes an implemented WPT system, the principle of operation of the electronic tuning method is discussed and extensive results based on experimental measurements are presented. Finally, Section VI includes the conclusion and future work.
Silvano Cruciani - One of the best experts on this subject based on the ideXlab platform.
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magnetic field mitigation by multiCoil active shielding in electric vehicles equipped with wireless power charging system
IEEE Transactions on Electromagnetic Compatibility, 2020Co-Authors: Tommaso Campi, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:A novel design of active Coil shielding is proposed to reduce the magnetic field generated by the currents flowing into the Coils of a wireless power transfer (WPT) system for charging the batteries of an electric vehicle (EV). The main idea is to divide the traditional active loop used to shield a source in two separate shielding Coils so as not to adversely affect the WPT performance. This concept is applied to shield the WPT Coils, and, therefore, in the proposed design, there are active Coils placed on the ground parallel to the Primary Coil of the WPT and some others on board below the vehicle, planarly located with the secondary Coil. The currents on the active Coils are optimized in order to minimize the magnetic field in the most critical zone accessible from humans, i.e., region besides the EV and in the cabin.
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active Coil system for magnetic field reduction in an automotive wireless power transfer system
International Symposium on Electromagnetic Compatibility, 2019Co-Authors: Tommaso Campi, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:A novel design of active Coils is proposed to reduce the magnetic field generated by the currents flowing into the Coils of a wireless power transfer (WPT) system for recharging the batteries of an electric vehicle (EV). The main idea is to split the traditional active loop, in two separate shielding Coils. They have semi-annular shape and are placed on the ground pad around the WPT Primary Coil. The geometry and excitation of the active Coils are varied to minimize the magnetic field beside the active Coils without degrading the WPT electrical performance.
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feasibility study of a wireless power transfer system applied to a leadless pacemaker
IEEE Wireless Power Transfer Conference, 2018Co-Authors: Tommaso Campi, V De Santis, Silvano Cruciani, Fernanda Maradei, Mauro FelizianiAbstract:This study deals with the battery recharge of a leadless pacemaker, which has been recently introduced in the market, by means of the wireless power transfer (WPT) technology based on the magnetic resonant coupling. The main difficulty is given by the depth of the leadless pacemaker implantation inside the human body. The electromagnetic problem mainly consists in the selection of the on-body excitation (Primary Coil current and frequency), which must adequately energize the leadless pacemaker without any exceedance of the basic restrictions (BRs) specified by the electromagnetic field (EMF) safety standards. Another relevant problem consists in the weight of the leadless pacemaker within the secondary Coil that must be very light. In this paper, a feasibility study is carried out to define possible solutions for this kind of application.
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High efficiency and lightweight wireless charging system for drone batteries
2017 AEIT International Annual Conference, 2017Co-Authors: T. Campi, Silvano Cruciani, Mauro Feliziani, Fernanda MaradeiAbstract:A high power and high efficiency Wireless Power Transfer (WPT) system based on magnetic resonant coupling is proposed to automatically recharge the battery of a small Unmanned Aerial Vehicle (UAV) (a remotely controlled drone). The drone is equipped with a WPT receiving (Rx) circular Coil with an electronic system to control the battery charging process, while the WPT transmitting (Tx) circular Coil is placed on a ground station and connected to the electric power feeding system. To improve the electrical performance and the tolerance to always possible misalignments between Rx and Tx Coils, the Primary Coil is placed on a 2-axes motorized positioning system suitable to achieve a quite perfect alignment. This aspect is very important in the application of the WPT technology to drones due to the poor precision of the landing systems.
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emf safety and thermal aspects in a pacemaker equipped with a wireless power transfer system working at low frequency
IEEE Transactions on Microwave Theory and Techniques, 2016Co-Authors: Tommaso Campi, Silvano Cruciani, Valerio De Santis, Mauro FelizianiAbstract:A wireless power transfer (WPT) system based on magnetic resonant coupling is applied to a pacemaker for recharge its battery. The Primary Coil is assumed to be on-body, while the secondary Coil is in-body. Three different configurations of the secondary Coil are hereby investigated placing it inside the titanium case of the pacemaker, on the top surface of the case, or being part of the top surface case. The operational frequency is fixed to be at a relatively low frequency (20 kHz) in order to allow field penetration through the case and to limit the electric and magnetic field safety and thermal increase issues. For each examined configuration, these aspects are investigated by numerical and experimental techniques. The obtained results demonstrate the feasibility of the proposed solutions highlighting their advantages and disadvantages.
