scholarly journals EXPERIMENTAL STUDY OF A TEST SAMPLE OF A WIRELESS POWER TRANSFER FOR ELECTRIC VEHICLES

2021 ◽  
Vol 2021 (5) ◽  
pp. 21-26
Author(s):  
V.B. Pavlov ◽  
◽  
O.D. Podoltsev ◽  
V.E. Pavlenko ◽  
◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Power Transmission ◽  
Experimental Studies ◽  
External Source ◽  
Test Sample ◽  
Outer Diameter ◽  
Storage Battery ◽  
Wireless Power ◽  
Inductive Type ◽  
Experimental Values

A prototype of a wireless charger of inductive type with serial resonance in the circuits of the transmitting and receiving coils has been developed and manufactured, and experimental studies of the efficiency of power transmission from an external source to a storage battery have been carried out. It is shown that the efficiency of the created sample takes values in the range 39% - 78 % and depends on the operating frequency and the distance between the coils. It is also shown that when using coils with an outer diameter of 500 mm, the positioning of these coils in the process of charging the battery at a distance of up to 10 cm does not lead to a significant decrease in efficiency. The experimental values of the efficiency are compared with the calculated ones obtained on a simplified model that takes into account only resistive losses in the coils, and it is shown that the experimental values of the efficiency are 15-20 % less than the calculated ones. References. 8, figures. 5, table 1.

Safety and Reliability of Wireless Charging System for Electric Vehicles Based on the Yunnan Power Grid

2014 ◽  
Vol 518 ◽  
pp. 324-328 ◽  
Author(s):  
Hong Liang Wang ◽  
Juan Liu ◽  
Min Cao ◽  
Xian Fu Chen ◽  
Da Da Wang ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Large Scale ◽  
Power Transmission ◽  
Power Grid ◽  
Wireless Charging ◽  
Wireless Power ◽  
Gradual Improvement ◽  
Electric Cars ◽  
Huge Impact ◽  
Battery Technology

Electric cars are emerged as the energy crisis and environmental problems have become more severe. Electric vehicles charging include contact and non-contact. The battery technology has not been solved absolutely for Contactless charging, in addition, charging pile construction will take up a lot of urban land, normal charge is slow, fast charge will have a huge impact to grid, the high cost of change the batteries, these drawbacks of electric vehicles has been hampered the large-scale development of EV. With the development and gradual improvement of wireless power transmission technology .wireless charging technology applied to electric vehicles has great prospects. In the wireless power charging process safe, reliable transmission is very important. In this paper, security and reliability problems have been discussed for the various aspects of wireless charging systems and combined analysis of the characteristics of Yunnan Power Grid for wireless charging systems of electric vehicles.

Wireless Charging System for Electric Vehicles

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
K. Paramesh ◽  
R.P. Neriya ◽  
M.V. Kumar
Keyword(s):  
Electric Vehicles ◽  
Power Transmission ◽  
Wireless Transmission ◽  
Electric Load ◽  
Wireless Charging ◽  
Electrical Load ◽  
Wireless Power ◽  
Charging System ◽  
Electrical Devices ◽  
Resonance Coupling

Wireless power transmission (WPT) is popular and gaining technology finding its application in various fields. The power is transferred from a source to an electrical load without the need of interconnections. WPT is useful to power electrical devices where physical wiring is not possible or inconvenient. The technology uses the principle of mutual inductance. One of the future applications finds in automotive sector especially in Electric Vehicles. This paper deals with research and development of wireless charging systems for Electric vehicles using wireless transmission. The main goal is to transmit power using resonance coupling and to build the charging systems. The systems deal with an AC source, transmission coil, reception coil, converter and electric load which are battery.

scholarly journals Collaborative Optimization Method of Power and Efficiency for LCC-S Wireless Power Transmission System

Electronics ◽  
2021 ◽  
Vol 10 (24) ◽  
pp. 3088
Author(s):  
Ming Xue ◽  
Qingxin Yang ◽  
Chunzhi Li ◽  
Pengcheng Zhang ◽  
Shuting Ma ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Power Transmission ◽  
Optimization Method ◽  
Collaborative Optimization ◽  
Wireless Power ◽  
Environmental Disturbances ◽  
Power Adjustment ◽  
Optimal Load ◽  
Optimal Efficiency ◽  
Equivalent Load

Dynamic wireless charging enables moving equipment such as electric vehicles, robots to be charged in motion, and thus is a research hotspot. The applications in practice, however, suffer from mutual inductance fluctuation due to unavoidable environmental disturbances. In addition, the load also changes during operation, which makes the problem more complicated. This paper analyzes the impacts of equivalent load and mutual inductances variation over the system by LCC-S topology modeling utilizing two-port theory. The optimal load expression is derived. Moreover, a double-sided control strategy enabling optimal efficiency and power adjustment is proposed. Voltage conducting angles on the inverter and rectifier are introduced. The simulation and experimental results verify the proposed method.

scholarly journals Optimal Path Configuration with Coded Laser Pilots for Charging Electric Vehicles Using High Intensity Laser Power Beams

2021 ◽  
Vol 11 (9) ◽  
pp. 3826
Author(s):  
Gunzung Kim ◽  
Imran Ashraf ◽  
Jeongsook Eom ◽  
Yongwan Park
Keyword(s):  
Electric Vehicles ◽  
High Intensity ◽  
Laser Power ◽  
Power Transmission ◽  
Optimal Path ◽  
Wireless Power ◽  
Pv Array ◽  
High Intensity Laser ◽  
Intensity Laser ◽  
Power Channel

Wireless power transmission (WPT) for wireless charging has been gaining wide attention as a promising approach to miniaturizing the battery size and increasing the maximal total range of an electric vehicle (EV). With an appropriate charging infrastructure, WPT holds great potential to accelerate the acceptance of EVs through users’ higher satisfaction, reducing EV cost, and increasing the driving range and capability. A WPT system based on high-intensity laser power beaming (HILPB) provides an optimal solution for wirelessly charging electric vehicles from a distance of several meters. Despite a large number of WPT approaches, the problem of optimal path configuration for charging EV remains an unexplored area. This paper proposes a method to determine the optimal power transmission path in environments where multiple power transmitters (PTXs) and power receivers (PRXs) are operated simultaneously. To this end, we modeled the HILPB power that reaches a PRX equipped with a photovoltaic (PV) array and validated the model by simulating the WPT process in an environment with multiple PTXs and PRXs using a direct-sequence optical code division multiple access (DS-OCDMA) system. In the simulation environment, upon receiving a request from a PRX, a PTX sent its power channel information through optically encoded laser pulses using each available wireless power channel (WPC). The PRX calculated the maximum deliverable power of a PTX and WPC based on the received channel power indicator of the incident laser beam. Based on the calculation results, it selected the optimal PTX and WPC for its maximum power requirement (MPQ). The MPQ of each PRX was satisfied by applying the algorithm for selecting the PTX according to the alignment and characteristics of the PTXs and PRXs. We modeled a power reception model of the PRX based on a PV array using coded laser pilots and validated it through experimentation. We discussed some algorithms that select the most suitable PTX among several PTXs for which several EVs receive the power it needs.

scholarly journals Double-Coil Dynamic Shielding Technology for Wireless Power Transmission in Electric Vehicles

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5271
Author(s):  
Yuan Li ◽  
Shumei Zhang ◽  
Ze Cheng
Keyword(s):  
Electromagnetic Field ◽  
Electric Vehicles ◽  
Power Transmission ◽  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Wireless Power ◽  
Modeling Simulation ◽  
Transmission Distance ◽  
Active Shielding ◽  
Different Levels

During wireless charging, the transmission distance of electric vehicles varies, resulting in different levels of electromagnetic field leakage. An improved active shielding technology, the double-coil dynamic shielding technology, is proposed in this paper for wireless power transfer (WPT) systems with different transmission distances. Modeling, simulation, and experiments are performed for the WPT system with a double-coil dynamic shielding scheme and compared with other cases. The results show that the proposed double-coil dynamic shielding scheme is able to shield approximately 70% of the electromagnetic field leakage for WPT systems at different transmission distances. In addition, it essentially causes no degradation in transmission efficiency (only 3.1%). The effectiveness and feasibility of the proposed scheme are verified.

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