An Improved and Integrated Design of Segmented Dynamic Wireless Power Transfer for Electric Vehicles

Abstract

This paper describes improvements in a segmented dynamic wireless power transfer (DWPT) system for electric vehicles (EVs), and aims to offer a stable charging method for high-power applications. An integrated design is presented, including the modified switching sequence, the size of segmented transmitters, and parallel inverter technology for high-power applications. Three consecutive transmitters mounted on the rail track are energized according to the position of the pickups. This three-consecutive-transmitter group is comprised of a Q-shaped coil, a DD-shaped coil, and a Q-shaped coil again (QDDQ). QDDQ is used as an elementary energized group to optimize the number of energized transmitters and mitigate the output voltage variation. The entire DWPT system is designed with finite element analysis (FEA) and studied with circuit topologies. Overall, an experimental prototype for dynamic charging is built to verify the overall performance, which shows a great agreement with the theoretical analysis. In this prototype, there are five transmitters and one receiver. All dimensions are 500 mm × 500 mm. The proposed system has been validated to realize 500 V constant output voltage with approximately 85% dc-dc efficiency from the 100 Ω to 200 Ω load conditions. A 2.5 kW maximum output power occurs at the 100 Ω load condition.

Challenges and Barriers of Wireless Charging Technologies for Electric Vehicles

“…The outcomes demonstrated the viability of the suggested model. Additionally, by placing two coil receivers under the car, the simulation results were validated by experimental testing [262]. The paucity of fossil fuels and environmental concerns indicates new energy challenges.…”

Modeling and Simulation of Dynamic Wireless Power Transfer Technique for Electric Vehicles

“…The transmitter coils for dynamic WPT can be single coil tracks or segmented coil tracks. The structure of that system is very simple, but power losses in that type of tracking system are more as compared to segmented tracks (Wang and Cheng., 2021). To overcome the problem of the single-coil track, a segmented coil track structure is to be a good choice for a dynamic wireless charging system ( Zhang et al, 2022) .…”

Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer

“…Coil Structure Efficiency Improvement (If Optimized) [7] UDD -−50% in cost [8] DD 85% - [12] DD -25% in coupling coefficient [13] Rectangular 95.5% - [15] DD 80% 6% in efficiency…”

“…In [7], the authors made an asymmetric design of the magnetic core structure of the DD-shaped wireless charging coupler for EVs, and also confirmed that this design can avoid the difference between the peak and average voltage induced across the pickup coil and lengthening the fraction of the distance between two track coils available to transfer power to the electric vehicles (EVs). Ref [8] also proposed the use of DD and Q coils for electric vehicles that has been seen to be a recent trend for EV wireless coils. Combined with the finite element analysis, the aspect ratio of the coil and the ferrite can also be optimized to make the coupling of the system and the placement of the ferrite more effective [9][10][11][12][13][14][15][16].…”