The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Ulrike Wallrabe - One of the best experts on this subject based on the ideXlab platform.
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A 2-D Magnetoinductive Wave Device for Freer Wireless Power Transfer
IEEE Transactions on Power Electronics, 2019Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:In this paper, we present a wireless power transfer (WPT) system with a two-dimensional (2-D) magnetoinductive wave (MIW) Device composed by two orthogonal sets of 1-D MIW Devices woven together. The Device is made by 112 double-spiral coils, a geometry that we have optimized to render a low attenuation propagation. This approach enables a charging area of 22 × 22 cm2 from which a Receiver Device can be supplied with energy with optimum efficiency from 32 different locations with the use of a single excitation port. We present a detailed optimization of the design and fabrication of the Device. To describe the behavior of the Device, we use a modeling method based on the impedance matrix that allows us to include all coupling interactions among the increased number of cells. With this method, we are able to find the optimal operating conditions like the location of the excitation and the coupling conditions of the Receiver Device. With the proposed 2-D MIW Device, we can provide up to 5 W to a load of 5 $\Omega$ located at the optimal axial separation. We corroborate our calculations with vector network analysis and dc output power measurements. Furthermore, we demonstrate the Device supplying to distinct types of loads simultaneously. This paper is accompanied by a supplementary file showing the required MATLAB script and input files to calculate the mutual inductance between a Receiver and the cells of the pad.
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Comprehensive Modeling of Magnetoinductive Wave Devices for Wireless Power Transfer
IEEE Transactions on Power Electronics, 2018Co-Authors: Fralett Suarez Sandoval, Ali Moazenzadeh, Ulrike WallrabeAbstract:This work presents an analytic model based on the impedance matrix that can predict the transferred energy to a movable Receiver Device in the near field of a magnetoinductive wave transmitter array. The formulas we present apply to any resonator geometry that can be described as a set of horizontal and vertical segments. The model accurately describes the system efficiency with respect to the operating frequency and to less constraining spatial configurations of the Receiver Device. The formulated expressions can be easily applied to distinct wireless power transfer system configurations, such as a single pair or an array of resonators, regardless their configuration. We demonstrate that the spatial resolution of the efficiency calculation is limited when only the first coupling order between the Receiver and the transmitter array is considered. However, high resolution is possible when first and second coupling orders are included. Additionally, we show that the model foresees the terminating impedance modulation schemes that we applied only after evaluation of data obtained experimentally. These modulation schemes prevent the Receiver from standing above a power null resulting from the interaction of forward and backward traveling waves, one of the major challenges in traveling wave based wireless power transfer Devices.
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Nulls-Free Wireless Power Transfer With Straightforward Control of Magnetoinductive Waves
IEEE Transactions on Microwave Theory and Techniques, 2017Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present a straightforward and yet, effective method to modulate the termination impedance of 1-D $LC$ resonating arrays for wireless power applications. The modulation method is based on activating/deactivating the last two cells of the array allowing to remove the power nulls caused by standing waves inside this type of arrays. The modulation of the terminating impedances is done at a distinct frequency than the resonance frequency of the cells. We explain why and how this distinct frequency was chosen. We further demonstrate how the same modulation is applicable for a wide range of load resistances on the Receiver Device. Modulation is achieved by wirelessly sensing the voltage delivered by the power supply according to where above the array a Receiver Device is located. A microcontroller records these voltages and determines which terminating impedance will provide the highest possible efficiency to the Receiver Device. Changes in the terminating impedances are set by digitally controlled solid state relays. The proposed modulation method permitted to power up a Receiver Device with a system efficiency of up to 60% anywhere over the 30 cm length of the resonating array.
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Double-spiral coils and live impedance modulation for efficient wireless power transfer via magnetoinductive waves
2016 IEEE Wireless Power Transfer Conference (WPTC), 2016Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present the design and fabrication of a double-spiral coil used as the inductive element of a two-layer coupled resonator array for wireless power transfer applications. The waveguide presents an in-plane coupling coefficient of 0.92 and LC resonators with Q-factors of 97 at 13.56 MHz. Wireless monitoring of the power supply voltage enabled live modulation of the terminating impedance in the array. With load modulation and the low attenuation of our Device we demonstrate how to power-up a Receiver Device with a system efficiency of nearly 60% anywhere over the 30 cm length of our resonating array.
Fralett Suarez Sandoval - One of the best experts on this subject based on the ideXlab platform.
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A 2-D Magnetoinductive Wave Device for Freer Wireless Power Transfer
IEEE Transactions on Power Electronics, 2019Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:In this paper, we present a wireless power transfer (WPT) system with a two-dimensional (2-D) magnetoinductive wave (MIW) Device composed by two orthogonal sets of 1-D MIW Devices woven together. The Device is made by 112 double-spiral coils, a geometry that we have optimized to render a low attenuation propagation. This approach enables a charging area of 22 × 22 cm2 from which a Receiver Device can be supplied with energy with optimum efficiency from 32 different locations with the use of a single excitation port. We present a detailed optimization of the design and fabrication of the Device. To describe the behavior of the Device, we use a modeling method based on the impedance matrix that allows us to include all coupling interactions among the increased number of cells. With this method, we are able to find the optimal operating conditions like the location of the excitation and the coupling conditions of the Receiver Device. With the proposed 2-D MIW Device, we can provide up to 5 W to a load of 5 $\Omega$ located at the optimal axial separation. We corroborate our calculations with vector network analysis and dc output power measurements. Furthermore, we demonstrate the Device supplying to distinct types of loads simultaneously. This paper is accompanied by a supplementary file showing the required MATLAB script and input files to calculate the mutual inductance between a Receiver and the cells of the pad.
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Comprehensive Modeling of Magnetoinductive Wave Devices for Wireless Power Transfer
IEEE Transactions on Power Electronics, 2018Co-Authors: Fralett Suarez Sandoval, Ali Moazenzadeh, Ulrike WallrabeAbstract:This work presents an analytic model based on the impedance matrix that can predict the transferred energy to a movable Receiver Device in the near field of a magnetoinductive wave transmitter array. The formulas we present apply to any resonator geometry that can be described as a set of horizontal and vertical segments. The model accurately describes the system efficiency with respect to the operating frequency and to less constraining spatial configurations of the Receiver Device. The formulated expressions can be easily applied to distinct wireless power transfer system configurations, such as a single pair or an array of resonators, regardless their configuration. We demonstrate that the spatial resolution of the efficiency calculation is limited when only the first coupling order between the Receiver and the transmitter array is considered. However, high resolution is possible when first and second coupling orders are included. Additionally, we show that the model foresees the terminating impedance modulation schemes that we applied only after evaluation of data obtained experimentally. These modulation schemes prevent the Receiver from standing above a power null resulting from the interaction of forward and backward traveling waves, one of the major challenges in traveling wave based wireless power transfer Devices.
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Nulls-Free Wireless Power Transfer With Straightforward Control of Magnetoinductive Waves
IEEE Transactions on Microwave Theory and Techniques, 2017Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present a straightforward and yet, effective method to modulate the termination impedance of 1-D $LC$ resonating arrays for wireless power applications. The modulation method is based on activating/deactivating the last two cells of the array allowing to remove the power nulls caused by standing waves inside this type of arrays. The modulation of the terminating impedances is done at a distinct frequency than the resonance frequency of the cells. We explain why and how this distinct frequency was chosen. We further demonstrate how the same modulation is applicable for a wide range of load resistances on the Receiver Device. Modulation is achieved by wirelessly sensing the voltage delivered by the power supply according to where above the array a Receiver Device is located. A microcontroller records these voltages and determines which terminating impedance will provide the highest possible efficiency to the Receiver Device. Changes in the terminating impedances are set by digitally controlled solid state relays. The proposed modulation method permitted to power up a Receiver Device with a system efficiency of up to 60% anywhere over the 30 cm length of the resonating array.
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Double-spiral coils and live impedance modulation for efficient wireless power transfer via magnetoinductive waves
2016 IEEE Wireless Power Transfer Conference (WPTC), 2016Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present the design and fabrication of a double-spiral coil used as the inductive element of a two-layer coupled resonator array for wireless power transfer applications. The waveguide presents an in-plane coupling coefficient of 0.92 and LC resonators with Q-factors of 97 at 13.56 MHz. Wireless monitoring of the power supply voltage enabled live modulation of the terminating impedance in the array. With load modulation and the low attenuation of our Device we demonstrate how to power-up a Receiver Device with a system efficiency of nearly 60% anywhere over the 30 cm length of our resonating array.
Ali Moazenzadeh - One of the best experts on this subject based on the ideXlab platform.
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A 2-D Magnetoinductive Wave Device for Freer Wireless Power Transfer
IEEE Transactions on Power Electronics, 2019Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:In this paper, we present a wireless power transfer (WPT) system with a two-dimensional (2-D) magnetoinductive wave (MIW) Device composed by two orthogonal sets of 1-D MIW Devices woven together. The Device is made by 112 double-spiral coils, a geometry that we have optimized to render a low attenuation propagation. This approach enables a charging area of 22 × 22 cm2 from which a Receiver Device can be supplied with energy with optimum efficiency from 32 different locations with the use of a single excitation port. We present a detailed optimization of the design and fabrication of the Device. To describe the behavior of the Device, we use a modeling method based on the impedance matrix that allows us to include all coupling interactions among the increased number of cells. With this method, we are able to find the optimal operating conditions like the location of the excitation and the coupling conditions of the Receiver Device. With the proposed 2-D MIW Device, we can provide up to 5 W to a load of 5 $\Omega$ located at the optimal axial separation. We corroborate our calculations with vector network analysis and dc output power measurements. Furthermore, we demonstrate the Device supplying to distinct types of loads simultaneously. This paper is accompanied by a supplementary file showing the required MATLAB script and input files to calculate the mutual inductance between a Receiver and the cells of the pad.
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Comprehensive Modeling of Magnetoinductive Wave Devices for Wireless Power Transfer
IEEE Transactions on Power Electronics, 2018Co-Authors: Fralett Suarez Sandoval, Ali Moazenzadeh, Ulrike WallrabeAbstract:This work presents an analytic model based on the impedance matrix that can predict the transferred energy to a movable Receiver Device in the near field of a magnetoinductive wave transmitter array. The formulas we present apply to any resonator geometry that can be described as a set of horizontal and vertical segments. The model accurately describes the system efficiency with respect to the operating frequency and to less constraining spatial configurations of the Receiver Device. The formulated expressions can be easily applied to distinct wireless power transfer system configurations, such as a single pair or an array of resonators, regardless their configuration. We demonstrate that the spatial resolution of the efficiency calculation is limited when only the first coupling order between the Receiver and the transmitter array is considered. However, high resolution is possible when first and second coupling orders are included. Additionally, we show that the model foresees the terminating impedance modulation schemes that we applied only after evaluation of data obtained experimentally. These modulation schemes prevent the Receiver from standing above a power null resulting from the interaction of forward and backward traveling waves, one of the major challenges in traveling wave based wireless power transfer Devices.
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Nulls-Free Wireless Power Transfer With Straightforward Control of Magnetoinductive Waves
IEEE Transactions on Microwave Theory and Techniques, 2017Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present a straightforward and yet, effective method to modulate the termination impedance of 1-D $LC$ resonating arrays for wireless power applications. The modulation method is based on activating/deactivating the last two cells of the array allowing to remove the power nulls caused by standing waves inside this type of arrays. The modulation of the terminating impedances is done at a distinct frequency than the resonance frequency of the cells. We explain why and how this distinct frequency was chosen. We further demonstrate how the same modulation is applicable for a wide range of load resistances on the Receiver Device. Modulation is achieved by wirelessly sensing the voltage delivered by the power supply according to where above the array a Receiver Device is located. A microcontroller records these voltages and determines which terminating impedance will provide the highest possible efficiency to the Receiver Device. Changes in the terminating impedances are set by digitally controlled solid state relays. The proposed modulation method permitted to power up a Receiver Device with a system efficiency of up to 60% anywhere over the 30 cm length of the resonating array.
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Double-spiral coils and live impedance modulation for efficient wireless power transfer via magnetoinductive waves
2016 IEEE Wireless Power Transfer Conference (WPTC), 2016Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present the design and fabrication of a double-spiral coil used as the inductive element of a two-layer coupled resonator array for wireless power transfer applications. The waveguide presents an in-plane coupling coefficient of 0.92 and LC resonators with Q-factors of 97 at 13.56 MHz. Wireless monitoring of the power supply voltage enabled live modulation of the terminating impedance in the array. With load modulation and the low attenuation of our Device we demonstrate how to power-up a Receiver Device with a system efficiency of nearly 60% anywhere over the 30 cm length of our resonating array.
Saraí M. Torres Delgado - One of the best experts on this subject based on the ideXlab platform.
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A 2-D Magnetoinductive Wave Device for Freer Wireless Power Transfer
IEEE Transactions on Power Electronics, 2019Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:In this paper, we present a wireless power transfer (WPT) system with a two-dimensional (2-D) magnetoinductive wave (MIW) Device composed by two orthogonal sets of 1-D MIW Devices woven together. The Device is made by 112 double-spiral coils, a geometry that we have optimized to render a low attenuation propagation. This approach enables a charging area of 22 × 22 cm2 from which a Receiver Device can be supplied with energy with optimum efficiency from 32 different locations with the use of a single excitation port. We present a detailed optimization of the design and fabrication of the Device. To describe the behavior of the Device, we use a modeling method based on the impedance matrix that allows us to include all coupling interactions among the increased number of cells. With this method, we are able to find the optimal operating conditions like the location of the excitation and the coupling conditions of the Receiver Device. With the proposed 2-D MIW Device, we can provide up to 5 W to a load of 5 $\Omega$ located at the optimal axial separation. We corroborate our calculations with vector network analysis and dc output power measurements. Furthermore, we demonstrate the Device supplying to distinct types of loads simultaneously. This paper is accompanied by a supplementary file showing the required MATLAB script and input files to calculate the mutual inductance between a Receiver and the cells of the pad.
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Nulls-Free Wireless Power Transfer With Straightforward Control of Magnetoinductive Waves
IEEE Transactions on Microwave Theory and Techniques, 2017Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present a straightforward and yet, effective method to modulate the termination impedance of 1-D $LC$ resonating arrays for wireless power applications. The modulation method is based on activating/deactivating the last two cells of the array allowing to remove the power nulls caused by standing waves inside this type of arrays. The modulation of the terminating impedances is done at a distinct frequency than the resonance frequency of the cells. We explain why and how this distinct frequency was chosen. We further demonstrate how the same modulation is applicable for a wide range of load resistances on the Receiver Device. Modulation is achieved by wirelessly sensing the voltage delivered by the power supply according to where above the array a Receiver Device is located. A microcontroller records these voltages and determines which terminating impedance will provide the highest possible efficiency to the Receiver Device. Changes in the terminating impedances are set by digitally controlled solid state relays. The proposed modulation method permitted to power up a Receiver Device with a system efficiency of up to 60% anywhere over the 30 cm length of the resonating array.
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Double-spiral coils and live impedance modulation for efficient wireless power transfer via magnetoinductive waves
2016 IEEE Wireless Power Transfer Conference (WPTC), 2016Co-Authors: Fralett Suarez Sandoval, Saraí M. Torres Delgado, Ali Moazenzadeh, Ulrike WallrabeAbstract:We present the design and fabrication of a double-spiral coil used as the inductive element of a two-layer coupled resonator array for wireless power transfer applications. The waveguide presents an in-plane coupling coefficient of 0.92 and LC resonators with Q-factors of 97 at 13.56 MHz. Wireless monitoring of the power supply voltage enabled live modulation of the terminating impedance in the array. With load modulation and the low attenuation of our Device we demonstrate how to power-up a Receiver Device with a system efficiency of nearly 60% anywhere over the 30 cm length of our resonating array.
Jukka Lekkala - One of the best experts on this subject based on the ideXlab platform.
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totally passive wireless biopotential measurement sensor by utilizing inductively coupled resonance circuits
Sensors and Actuators A-physical, 2010Co-Authors: Jarno Riistama, E Aittokallio, Jarmo Verho, Jukka LekkalaAbstract:Abstract A measurement method to measure biopotentials with a passive LC resonator is presented. The sensor consists of an LC resonance circuit where the capacitive component is a varactor and the biopotential electrodes are connected over the varactor ends. This induces a change in the varactor capacitance which can be measured over an inductive link as modified reflected impedance. The sensor itself dissipates virtually no energy at all but of course, some energy is lost in form of resistive losses in the sensor wires and components. The sensor is inexpensive to manufacture and since it is a totally passive Device, it is very suitable for implantable applications. Two different measurement methods to sense the reflected impedance are also presented: a slope detector and a phase locked detector. Measurement results from human ECG are discussed that are measured with the both suggested measurement methods. The sensor is proven to be suitable for biopotential measurements with some limitations regarding the movements between the sensor and the Receiver Device. The properties and performance of the two different measurement Devices are discussed. The measurement range, i.e. distance between the sensor and the measurement coils was approximately 5 cm in air for the both measurement Devices. However, it seems that the phase locked measurement Device suits better to the measurements than the slope detector since its signal-to-noise ratio remains almost constant throughout the measurement range (distance).
