scholarly journals Research on Dual-Phase Non-Salient Pole Receiver for EV Dynamic Wireless Power Transfer System

2021 ◽  
Vol 12 (3) ◽  
pp. 157
Author(s):  
Fandan Zhao ◽  
Jinhai Jiang ◽  
Shumei Cui ◽  
Chunbo Zhu ◽  
C. C. Chan
Keyword(s):  
Wireless Power Transfer ◽  
Simulation Method ◽  
Dual Phase ◽  
Receiver Design ◽  
Power Transfer ◽  
Wireless Power ◽  
Output Performance ◽  
Salient Pole ◽  
Element Simulation ◽  
Battery Capacity

Dynamic wireless power transfer (DWPT) technology shows a vast development prospect for EV application, with advantages of reducing the demand for battery capacity and improving the user experience. However, the need to improve output performance leads to a challenge in receiver design with limited space and allowable load on the EV side. In this paper, a design of a dual-phase non-salient pole (NSP) receiver for the EV DWPT system with bipolar transmitter is proposed, aiming at providing a solution to the contradiction between reducing the volume or cost and improving the misalignment tolerance of the receiver. The coupling principle of the proposed receiver is analyzed. The structure parameters are optimized by the finite-element simulation method. Combined with specific design indexes, it is proven by comparison with the existing dual-phase receiver that the proposed receiver is 35.4% smaller in volume and needs 47.0% shorter wires. Moreover, the significant advantage of the proposed dual-phase NSP receiver in misalignment tolerance is verified by simulations and experimental comparisons.

scholarly journals Wireless Power Transfer System with Enhanced Efficiency by Using Frequency Reconfigurable Metamaterial

2021 ◽  
Author(s):  
Dongyong Shan ◽  
Haiyue Wang ◽  
Ke Cao ◽  
Junhua Zhang
Keyword(s):  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Resonant Coupling ◽  
Sensor Applications ◽  
Electric Vehicle Charging ◽  
Element Simulation ◽  
Power Transfer Efficiency ◽  
Wireless Power Transfer System ◽  
System Frequency

Abstract The wireless power transfer (WPT) system has been widely used in various fields such as household appliances, electric vehicle charging and sensor applications. A frequency reconfigurable magnetic resonant coupling wireless power transfer (MRCWPT) system with dynamically enhanced efficiency by using the frequency reconfigurable metamaterial is proposed in this paper. The reconfigurability is achieved by adjusting the capacitance value of the variable capacitor connected in the coil of the system. Finite element simulation results have shown that the frequency reconfigurable electromagnetic metamaterial can manipulate the direction of the electromagnetic field of the system due to its abnormal effective permeability. The ultra-thin frequency reconfigurable metamaterial is designed at the different working frequency of 14.1 MHz, 15 MHz, 16.2 MHz, 17.5 MHz, 19.3 MHz, 21.7 MHz and 25 MHz to enhance the magnetic field and power transfer efficiency (PTE) of the system. Frequency reconfigurable mechanism of the system with the frequency reconfigurable metamaterial is derived by the equivalent circuit theory. Finally, further measurement which verifies the simulation by reasonable agreement is carried out. PTE of the system by adding the metamaterial are 59%, 73%, 67%, 66%, 65%, 60% and 58% at different working frequencies. PTE of the system without and with the metamaterial is 72% and 49% at the distance of 120 mm and the frequency of 15 MHz, respectively.

scholarly journals Impact of Node Speed on Energy-Constrained Opportunistic Internet-of-Things with Wireless Power Transfer

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2398 ◽  
Author(s):  
Seung-Woo Ko ◽  
Seong-Lyun Kim
Keyword(s):  
Internet Of Things ◽  
Data Exchange ◽  
Safety Issue ◽  
Density Ratio ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Transfer Energy ◽  
Battery Capacity ◽  
Energy Constrained

Wireless power transfer (WPT) is a promising technology to realize the vision of Internet-of-Things (IoT) by powering energy-hungry IoT nodes by electromagnetic waves, overcoming the difficulty in battery recharging for massive numbers of nodes. Specifically, wireless charging stations (WCS) are deployed to transfer energy wirelessly to IoT nodes in the charging coverage. However, the coverage is restricted due to the limited hardware capability and safety issue, making mobile nodes have different battery charging patterns depending on their moving speeds. For example, slow moving nodes outside the coverage resort to waiting for energy charging from WCSs for a long time while those inside the coverage consistently recharge their batteries. On the other hand, fast moving nodes are able to receive energy within a relatively short waiting time. This paper investigates the above impact of node speed on energy provision and the resultant throughput of energy-constrained opportunistic IoT networks when data exchange between nodes are constrained by their intermittent connections as well as the levels of remaining energy. To this end, we design a two-dimensional Markov chain of which the state dimensions represent remaining energy and distance to the nearest WCS normalized by node speed, respectively. Solving this enables providing the following three insights. First, faster node speed makes the inter-meeting time between a node and a WCS shorter, leading to more frequent energy supply and higher throughput. Second, the above effect of node speed becomes marginal as the battery capacity increases. Finally, as nodes are more densely deployed, the throughput becomes scaling with the density ratio between mobiles and WCSs but independent of node speed, meaning that the throughput improvement from node speed disappears in dense networks. The results provide useful guidelines for IoT network provisioning and planning to achieve the maximum throughput performance given mobile environments.

scholarly journals Design of High-Power Static Wireless Power Transfer via Magnetic Induction: An Overview

2021 ◽  
Vol 6 (4) ◽  
pp. 281-297
Author(s):  
Yiming Zhang ◽  
Keyword(s):  
High Power ◽  
Magnetic Induction ◽  
State Of The Art ◽  
Wireless Power Transfer ◽  
The State ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Electronics Converters ◽  
Battery Capacity ◽  
Power Capability

Recent years have witnessed the booming development of wireless power transfer (WPT) via magnetic induction, which has the advantages of convenience, safety, and feasibility to special occasions. WPT can be applied to electric vehicles and ships, where high-power WPT technology is required to shorten the charging time with the increasing battery capacity. This paper reviews the state-of-the-art development of high-power static WPT systems via magnetic induction. Selected prototypes and demos of high-power WPT systems are demonstrated with key transfer characteristics and solutions. Theoretical foundation of magnetically coupled WPT systems is analyzed and the maximum power capability of coils is derived. Compensation topologies suitable for high-power applications are discussed. Four basic planar coils, namely the bipolar coil, the square coil, the circular coil, and the rectangular coil, are simulated and compared. The state-of-the-art silicon carbide MOSFET development is introduced. The power electronics converters with power elevation techniques, including cascading, paralleling and inductive elevation, are investigated. Future development of high-power WPT systems is discussed.

scholarly journals Wireless power transfer system with enhanced efficiency by using frequency reconfigurable metamaterial

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Dongyong Shan ◽  
Haiyue Wang ◽  
Ke Cao ◽  
Junhua Zhang
Keyword(s):  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Resonant Coupling ◽  
Sensor Applications ◽  
Electric Vehicle Charging ◽  
Element Simulation ◽  
Power Transfer Efficiency ◽  
Wireless Power Transfer System ◽  
System Frequency

AbstractThe wireless power transfer (WPT) system has been widely used in various fields such as household appliances, electric vehicle charging and sensor applications. A frequency reconfigurable magnetic resonant coupling wireless power transfer (MRCWPT) system with dynamically enhanced efficiency by using the frequency reconfigurable metamaterial is proposed in this paper. The reconfigurability is achieved by adjusting the capacitance value of the adjustable capacitor connected in the coil of the system. Finite element simulation results have shown that the frequency reconfigurable electromagnetic metamaterial can manipulate the direction of the electromagnetic field of the system due to its abnormal effective permeability. The ultra-thin frequency reconfigurable metamaterial is designed at different working frequencies of 14.1 MHz, 15 MHz, 16.2 MHz, 17.5 MHz, 19.3 MHz, 21.7 MHz and 25 MHz to enhance the magnetic field and power transfer efficiency (PTE) of the system. Frequency reconfigurable mechanism of the system with the frequency reconfigurable metamaterial is derived by the equivalent circuit theory. Finally, further measurement which verifies the simulation by reasonable agreement is carried out. PTE of the system by adding the metamaterial are 59%, 73%, 67%, 66%, 65%, 60% and 58% at different working frequencies. PTE of the system with and without the metamaterial is 72% and 49% at the distance of 120 mm and the frequency of 15 MHz, respectively.

scholarly journals Application of wireless power transfer technologies and intermittent energy harvesting for wireless sensors in rotating machines

2016 ◽  
Vol 3 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Qingfeng Xia ◽  
Longyang Yan
Keyword(s):  
Wireless Sensors ◽  
Wireless Power Transfer ◽  
Sensor Nodes ◽  
Receiver Coil ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Rotating Machines ◽  
Battery Capacity ◽  
Transmitter Coil

Battery-powered wireless sensor networks have been extensively deployed in condition monitoring and structural health monitoring systems, but the performance of wireless sensors are limited by battery capacity and difficulty of application in rotating machines. In this paper, a variety of commercial wireless charging solutions and coil-shaft configurations for magnetic coupling are compared, having in mind of the application of continuously charging wireless sensors on rotating machines. For the co-axial configuration of the transmitter coil and the receiver coil, a Qi standard compliant wireless charging kit and a custom charging circuit are successfully applied to charge wireless sensors on small rotating test rigs. In order to harvest and store intermittent energy input from the wireless power source, a prototype receiver circuit using a supercapacitor and low-dropout regulator is designed and validated. Based on the prototype circuit, the radial configuration of single transmitter coil and multiple receiver coils is demonstrated for wireless power transfer to the sensor nodes on the drivetrain of a small wind turbine test rig.

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