EPE Association: EPE 2019 - DS2k: Contactless Power Supplies and Wireless Power Transfer

EPE 2019 - DS2k: Contactless Power Supplies and Wireless Power Transfer
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 07: Power Supplies > EPE 2019 - DS2k: Contactless Power Supplies and Wireless Power Transfer

   [return to parent folder]

   A Dynamic S/SP Compensation Network for Achieving Unity-Power-Factor and Load-Independent Voltage Output under Varying Coupling Condition
By Chi Shing WONG [View]
[Download]

Abstract: This paper proposes a dynamic series/series-parallel (S/SP) compensation network based on switch-controlled capacitor (SCC) for matching the series and parallel resonant frequencies of the networksuch that the magnetizing inductance of a transformer can be adaptively compensated under differentair gaps/misalignments. As a result, the requirements of load-independent voltage output and unityinput power factor can be simultaneously fulfilled under different coupling conditions by a single-stage converter. An experimental prototype with the air gap ranging from 10 - 16 cm is built to verify the idea.

   A Three-Phase LCC/Single-Phase S Compensation Topology for DWPT-TS System
By Shumei CUI [View]
[Download]

Abstract: The three-phase inverter is complex because of the different impedance of DWPT-TS system. This paper presents a three-phase LCC to single-phase S compensation topology, ensure the primary currents symmetrical and independent of the impedance, the receiving voltage constant, and simplify the inverter. Experiment results prove the feasibility of this topology.

   A tripolar wireless power transfer system with low leakage magnetic field for railway vehicles
By Beibei SONG [View]
[Download]

Abstract: In the dynamic wireless power transfer(WPT) system, the leakage magnetic field(EMF) is harmful to surrounding electronic devices and pedestrians. To solve this problem, this paper proposes a new tripolar WPT system with low leakage EMF. The advantages of this system are proved by theoretical calculation, simulation and experimental verification.

   Active Phase Shifting Method for Different Resonant Converter Configurations in Inductive Power Transfer (IPT) Systems
By Malvika KAMAT [View]
[Download]

Abstract: Active phase shifting method incorporates change in phase and amplitude of fundamental primary inverter output and secondary rectifier input voltages of a resonant DC/DC converter. This paper presents implementation of this method on four basic topologies of resonant tank configurations or compensation circuits of a resonant converter. Smooth variation of input power along with Zero Voltage Switching (ZVS) regions both on primary and secondary side have been observed for different configurations. Equations for input power as a function of the phase angles, switching frequency, input and output voltage amplitudes and the values of the reactive components have been derived. The results are verified with simulations of all the configurations and practical setup for one of the best configuration for IPT systems.

   Controller Design for Wirelessly Powered Heart Pump Drive
By Amir HAKEMI [View]
[Download]

Abstract: The application of mechanical circulatory support systems (blood pump) has been increasingly gaining popularity as the potential therapy for end-stage heart failures. However, due to the practical issues such as potential risk of infection at the exit site of the driveline of the motor, many complications and side effects are reported. As a possible solution, wireless power transfer (WPT) systems have been considered in order to remove the percutaneous driveline. Presently, wireless power transfer systems have been researched extensively in the literature and many of them are dedicated to medical applications. However, in those studies, the load is considered as a simple resistor and such systems are mainly designed for battery charging applications. In this paper, the complete structure of the WPT system including the motor drive is considered in the process of designing a controller for the blood pump.

   Interoperability Analysis of Two Different Coil Systems for Inductive Power Transfer
By Denis KRAUS [View]
[Download]

Abstract: In order to establish inductive charging for electric vehicles (EV) in public places, interoperability between primary (charging stations) and secondary (vehicles) sides must be provided. This paper usesfinite element analysis and network circuit analysis to compare two different coil systems regarding interoperability aspects, such as efficiency and maximum transferable output power for different positional offsets and air-gap classes with certain boundaries and limitations of the power electronics. To improve performance the influence of series adaptive capacitor tuning on these aspects is investigated as well. Furthermore, the magnetic leakage field distributions of the models are evaluated. It is shown that proper tuning of the primary side helps to increase interoperability due to the improvement of the power transfer capabilities in offset and reduction of coil currents and therefore reduce magnetic leakage fields.

   Investigation and Design of Multi-Transmitter Coil Inductive Power Transfer System to Increase Misalignment Tolerance
By Ekkachai CHAIDEE [View]
[Download]

Abstract: The efficiency of an inductive power transfer (IPT) system is greatly affected by lateral misalignment between the transmitter and receiver coils. This study proposes a hexagonal arrangement of multi-coil configuration IPT system to improve misalignment tolerance while maintaining the transfer efficiency. Key parameters including equivalent self and mutual inductance of various coil connections are examined. The magnetic characteristics including flux distribution and density, and mutual inductanceare simulated using COMSOL Multiphysics software package. Experimental results of the proposed multi-coil IPT system are given and compared with the conventional two-coil IPT system. Simulation and experimental results have shown that the proposed multi-transmitter coil configuration can increase misalignment tolerance compared with conventional system.

   Resonant Frequency Tuning System for Repeater Resonator of Resonant Inductive Coupling Wireless Power Transfer
By Akihiro KONISHI [View]
[Download]

Abstract: The resonant inductive coupling wireless power transfer (RIC-WPT) is a promising technique of the wireless power transfer with comparatively large power and high efficiency. However, the performance of RIC-WPT system is generally highly dependent on the fine adjustment of the resonant frequency between the transmitter, receiver, and repeater resonators, although the natural tolerance of the capacitor and inductance of the coil may easily lead to the significant detuning of the resonant frequency. Particularly, the repeater resonator is the key item that can improve the power transfer to a distantly located receiver resonator. However, the repeater resonator tends to have a high quality-factor; and therefore, its performance can be easily deteriorated by the detuning of the resonant frequency. The purpose of this paper is to propose a simple automatic resonant frequency tuning system for the repeater resonator as a remedy for the performance deterioration due to the resonant frequency detuning. The operation of the automatic resonant frequency tuning system was experimentally tested using the prototype wireless power transfer system. The result exhibited robust power transfer capability regardless of the natural tolerance of the resonant frequency.

   Three-phase Wireless Power Supply System Using Matrix Converter
By Jun-ichi ITOH [View]
[Download]

Abstract: This paper proposes a three-phase wireless power transfer (WPT) system with three-phase to three-phase matrix converter to integrate the transmission coils with the power converter on the transmission side suitable for high temperature operation. The proposed system expands a lifetime of the WPT system due to eliminates a electrolytic capacitor. Furthermore, the space installed the WPT system is saved. A novel hybrid commutation method, which is suitable for the WPT system with a resonant characteristic, is employed to avoid the commutation failure of the matrix converter. The strategy of the proposed hybrid commutation is based on an estimation of the current direction considering to the resonant characteristic and the elimination of the commutation in the critical area. The proposed commutation method achieves AC input-current THD of 4.7\% with the resonant three-phase load without any current sensor on the high-frequency side. Furthermore, the proposed WPT system achieves a maximum system efficiency of 88.2\% under condition of 400-V AC input 400-V DC output and 4-kW output power.

EPE 2019 - DS2k: Contactless Power Supplies and Wireless Power Transfer
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 07: Power Supplies > EPE 2019 - DS2k: Contactless Power Supplies and Wireless Power Transfer
	[return to parent folder]

	A Dynamic S/SP Compensation Network for Achieving Unity-Power-Factor and Load-Independent Voltage Output under Varying Coupling Condition By Chi Shing WONG	[View] [Download]
Abstract: This paper proposes a dynamic series/series-parallel (S/SP) compensation network based on switch-controlled capacitor (SCC) for matching the series and parallel resonant frequencies of the networksuch that the magnetizing inductance of a transformer can be adaptively compensated under differentair gaps/misalignments. As a result, the requirements of load-independent voltage output and unityinput power factor can be simultaneously fulfilled under different coupling conditions by a single-stage converter. An experimental prototype with the air gap ranging from 10 - 16 cm is built to verify the idea.

	A Three-Phase LCC/Single-Phase S Compensation Topology for DWPT-TS System By Shumei CUI	[View] [Download]
Abstract: The three-phase inverter is complex because of the different impedance of DWPT-TS system. This paper presents a three-phase LCC to single-phase S compensation topology, ensure the primary currents symmetrical and independent of the impedance, the receiving voltage constant, and simplify the inverter. Experiment results prove the feasibility of this topology.

	A tripolar wireless power transfer system with low leakage magnetic field for railway vehicles By Beibei SONG	[View] [Download]
Abstract: In the dynamic wireless power transfer(WPT) system, the leakage magnetic field(EMF) is harmful to surrounding electronic devices and pedestrians. To solve this problem, this paper proposes a new tripolar WPT system with low leakage EMF. The advantages of this system are proved by theoretical calculation, simulation and experimental verification.

	Active Phase Shifting Method for Different Resonant Converter Configurations in Inductive Power Transfer (IPT) Systems By Malvika KAMAT	[View] [Download]
Abstract: Active phase shifting method incorporates change in phase and amplitude of fundamental primary inverter output and secondary rectifier input voltages of a resonant DC/DC converter. This paper presents implementation of this method on four basic topologies of resonant tank configurations or compensation circuits of a resonant converter. Smooth variation of input power along with Zero Voltage Switching (ZVS) regions both on primary and secondary side have been observed for different configurations. Equations for input power as a function of the phase angles, switching frequency, input and output voltage amplitudes and the values of the reactive components have been derived. The results are verified with simulations of all the configurations and practical setup for one of the best configuration for IPT systems.

	Controller Design for Wirelessly Powered Heart Pump Drive By Amir HAKEMI	[View] [Download]
Abstract: The application of mechanical circulatory support systems (blood pump) has been increasingly gaining popularity as the potential therapy for end-stage heart failures. However, due to the practical issues such as potential risk of infection at the exit site of the driveline of the motor, many complications and side effects are reported. As a possible solution, wireless power transfer (WPT) systems have been considered in order to remove the percutaneous driveline. Presently, wireless power transfer systems have been researched extensively in the literature and many of them are dedicated to medical applications. However, in those studies, the load is considered as a simple resistor and such systems are mainly designed for battery charging applications. In this paper, the complete structure of the WPT system including the motor drive is considered in the process of designing a controller for the blood pump.

	Interoperability Analysis of Two Different Coil Systems for Inductive Power Transfer By Denis KRAUS	[View] [Download]
Abstract: In order to establish inductive charging for electric vehicles (EV) in public places, interoperability between primary (charging stations) and secondary (vehicles) sides must be provided. This paper usesfinite element analysis and network circuit analysis to compare two different coil systems regarding interoperability aspects, such as efficiency and maximum transferable output power for different positional offsets and air-gap classes with certain boundaries and limitations of the power electronics. To improve performance the influence of series adaptive capacitor tuning on these aspects is investigated as well. Furthermore, the magnetic leakage field distributions of the models are evaluated. It is shown that proper tuning of the primary side helps to increase interoperability due to the improvement of the power transfer capabilities in offset and reduction of coil currents and therefore reduce magnetic leakage fields.

	Investigation and Design of Multi-Transmitter Coil Inductive Power Transfer System to Increase Misalignment Tolerance By Ekkachai CHAIDEE	[View] [Download]
Abstract: The efficiency of an inductive power transfer (IPT) system is greatly affected by lateral misalignment between the transmitter and receiver coils. This study proposes a hexagonal arrangement of multi-coil configuration IPT system to improve misalignment tolerance while maintaining the transfer efficiency. Key parameters including equivalent self and mutual inductance of various coil connections are examined. The magnetic characteristics including flux distribution and density, and mutual inductanceare simulated using COMSOL Multiphysics software package. Experimental results of the proposed multi-coil IPT system are given and compared with the conventional two-coil IPT system. Simulation and experimental results have shown that the proposed multi-transmitter coil configuration can increase misalignment tolerance compared with conventional system.

	Resonant Frequency Tuning System for Repeater Resonator of Resonant Inductive Coupling Wireless Power Transfer By Akihiro KONISHI	[View] [Download]
Abstract: The resonant inductive coupling wireless power transfer (RIC-WPT) is a promising technique of the wireless power transfer with comparatively large power and high efficiency. However, the performance of RIC-WPT system is generally highly dependent on the fine adjustment of the resonant frequency between the transmitter, receiver, and repeater resonators, although the natural tolerance of the capacitor and inductance of the coil may easily lead to the significant detuning of the resonant frequency. Particularly, the repeater resonator is the key item that can improve the power transfer to a distantly located receiver resonator. However, the repeater resonator tends to have a high quality-factor; and therefore, its performance can be easily deteriorated by the detuning of the resonant frequency. The purpose of this paper is to propose a simple automatic resonant frequency tuning system for the repeater resonator as a remedy for the performance deterioration due to the resonant frequency detuning. The operation of the automatic resonant frequency tuning system was experimentally tested using the prototype wireless power transfer system. The result exhibited robust power transfer capability regardless of the natural tolerance of the resonant frequency.

	Three-phase Wireless Power Supply System Using Matrix Converter By Jun-ichi ITOH	[View] [Download]
Abstract: This paper proposes a three-phase wireless power transfer (WPT) system with three-phase to three-phase matrix converter to integrate the transmission coils with the power converter on the transmission side suitable for high temperature operation. The proposed system expands a lifetime of the WPT system due to eliminates a electrolytic capacitor. Furthermore, the space installed the WPT system is saved. A novel hybrid commutation method, which is suitable for the WPT system with a resonant characteristic, is employed to avoid the commutation failure of the matrix converter. The strategy of the proposed hybrid commutation is based on an estimation of the current direction considering to the resonant characteristic and the elimination of the commutation in the critical area. The proposed commutation method achieves AC input-current THD of 4.7\% with the resonant three-phase load without any current sensor on the high-frequency side. Furthermore, the proposed WPT system achieves a maximum system efficiency of 88.2\% under condition of 400-V AC input 400-V DC output and 4-kW output power.