scholarly journals Wireless charging system for electric bicycle application

2020 ◽  
Vol 11 (4) ◽  
pp. 1926
Author(s):  
Nguyen Thi Diep ◽  
Nguyen Kien Trung ◽  
Tran Trong Minh
Keyword(s):  
High Efficiency ◽  
Control Method ◽  
Constant Current ◽  
Wireless Charging ◽  
Load Impedance ◽  
Simple Method ◽  
Charging System ◽  
Current Voltage ◽  
Electric Bicycle ◽  
Charging Mode

This paper presents a design of the wireless charging system for e-byke applications. The double-side LCC compensation circuit is used to achieve high efficiency and reduce the volt-ampere rating. A new constant current/voltage (CC/CV) charging control method at the transmitter side is proposed to avoid dual side wireless communication. This paper also presents a simple method of estimating both the coupling coefficient and load impedance only from the transmitter side. A wireless charging system of 2.5kW is built. Error in the CC/CV charging mode is 3.3% and 1.12%, respectively. System efficiency reaches 92.1% in CC charging mode.

scholarly journals Primary Control Method of Wireless Charging System Based on Load Characteristics

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1269 ◽  
Author(s):  
Guodong Chen ◽  
Chao Rao ◽  
Yue Sun ◽  
Zhenxin Chen ◽  
Chunsen Tang ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Control Method ◽  
Lithium Ion ◽  
Input Voltage ◽  
Constant Current ◽  
Primary Control ◽  
Wireless Charging ◽  
Charging System ◽  
Equivalent Load ◽  
Secondary Side

Aiming at the output control issues of a lithium ion battery wireless charging system, a primary side control method based on load characteristic identification is proposed. The primary side impedance is calculated by detecting the effective value of the primary side voltage and current, and the mapping relationship between the equivalent load and the primary side impedance is established based on the AC impedance model. Using this mapping relation, the output of the secondary side can be regulated indirectly by controlling the input voltage of the inverter. Compared with the traditional control methods, the proposed control method not only eliminates the communication requirement between the primary side and secondary side, but also simplifies the hardware circuit design, reduces the complexity of the control circuit and also reduces the volume and cost of the system. In the paper, the impedance characteristics of the lithium ion battery at constant current and constant voltage stage are analyzed. The principle of the primary side control method is expounded and the realization method is given. The feasibility of the proposed control method is verified by simulation and experiment.

scholarly journals Adaptive Smart Control Method for Electric Vehicle Wireless Charging System

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2685 ◽  
Author(s):  
Lingbing Gong ◽  
Chunyan Xiao ◽  
Bin Cao ◽  
Yuliang Zhou
Keyword(s):  
Control System ◽  
Control Method ◽  
Characteristic Curve ◽  
Constant Current ◽  
Voltage Source ◽  
Wireless Charging ◽  
Charging Time ◽  
Multi Stage ◽  
Smart Charging ◽  
Smart Control

In order to shorten the wireless charging time of electric vehicles (EVs) and achieve stable charging, an adaptive smart control method for EV wireless charging is proposed in the paper. The method dynamically tracks the rechargeable battery state during the whole charging process, realizes multi-stage charging of constant current (CC) or constant voltage (CV) by switching two kinds of compensation networks of bilateral L3C and L3C-C, and regulates the charging voltage and current to make it as close as possible to the battery charging characteristic curve. This method can be implemented because the voltage source connected to the coupler and the compensation networks of bilateral L3C and L3C-C have the CC and CV source characteristics, respectively. On the basis of the established adaptive smart control system of EV wireless charging, the experiments of wireless data transmission and adaptive smart charging were conducted. The results showed that the designed control system had a response time of less than 200 ms and strong anti-interference ability and it shortened the charging time by about 16% compared with the time using traditional charging methods, thereby achieving a fast, stable, safe, and complete wireless charging process.

scholarly journals Misalignment-Tolerant Series Hybrid with Active Adjustable Constant Current and Constant Voltage Output Wireless Charging System

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7594
Author(s):  
Zhao-Wei Gong ◽  
Jin-Gang Li ◽  
Xiang-Qian Tong
Keyword(s):  
Constant Current ◽  
Outer Diameter ◽  
Wireless Charging ◽  
Constant Voltage ◽  
Load Variations ◽  
Charging System ◽  
Voltage Output ◽  
Operating Region ◽  
Constant Output ◽  
Output Characteristics

This paper presents a series hybrid wireless charging system with an active adjustable circuitry offering constant current and constant voltage output characteristics. The series hybrid system consists of the inductor–capacitor–capacitor (LCC) and series-series (SS) networks are used for improving charging pad misalignment tolerance. An active switch is employed to provide an adjustable CC and CV output for different battery charging stages. To demonstrate the performance of the proposed method, a 310 W prototype was built. A systematic optimization in the parameter of the proposed topology to achieve relative constant output was analyzed within a certain range of the designed operating region. The experimental results indicate that the output current fluctuation is less than 5% with load variations, and the output voltage fluctuation is less than 5% with load varying from 19 to 70 Ω, as the pick-up pads misaligned within 50% of the pad outer diameter.

Wireless Charging of Electric Vehicles: A Review and Experiments

2011 ◽  
Author(s):  
Chengbin Ma ◽  
Minfan Fu ◽  
Xinen Zhu
Keyword(s):  
Magnetic Resonance ◽  
Electric Vehicle ◽  
Electric Vehicles ◽  
High Efficiency ◽  
System Level ◽  
Prototype System ◽  
Wireless Charging ◽  
Charging System ◽  
Magnetic Resonance Coupling ◽  
Resonance Coupling

In this paper, the technologies for electric vehicle wireless charging are reviewed including the inductive coupling, magnetic resonance coupling and microwave. Among them, the magnetic resonance coupling is promising for vehicle charging mainly due to its high efficiency and relatively long transfer range. The design and configuration of the magnetic resonance coupling based wireless charging system are introduced. A basic experimental setup and a prototype electric vehicle wireless charging system are developed for experimental and research purposes. Especially the prototype system well demonstrates the idea of fast and frequent wireless charging of supercapacitor electric vehicles using magnetic resonance coupling. Though the idea of wireless energy transfer looks sophisticated, it is proved to be a handy technology from the work described in the paper. However, both component and system-level optimization are still very challenging. Intensive investigations and research are expected in this aspect.

scholarly journals A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1409 ◽  
Author(s):  
Ziwei Liang ◽  
Jianqiang Wang ◽  
Yiming Zhang ◽  
Jiuchun Jiang ◽  
Zhengchao Yan ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Load Condition ◽  
Consumer Electronics ◽  
Constant Current ◽  
Receiver Design ◽  
Wireless Charging ◽  
Compensation Circuit ◽  
Current Output ◽  
Charging System ◽  
Compact Design

A compact spatial free-positioning wireless charging system with a novel three-dimensional (3D) transmitting (Tx) coil is proposed to charge consumer electronics in the working area. Because of the strengthened electromagnetic field generated by the proposed 3D Tx coil in the space, this system can charge consumer electronics wirelessly with great tolerance to positional and angular misalignments between the transmitter and receiver. Benefiting from the compact design of the 3D Tx coil, the system can be easily embedded in some corners of office furniture/cubic panels, which will not cause any extra working space consumption when charging devices. The inductor-capacitor-capacitor (LCC) compensation circuit on the Tx side can achieve constant current output, which is independent of load condition and can protect the transmitter. With the LCC compensation circuit, the MOSFETs of the H-bridge high-frequency inverter realized zero voltage switching (ZVS). The small-sized planar receiving (Rx) coil and series (S) compensation circuit is applied to achieve compact receiver design. The theoretical and experimental results show that the spatial free-positioning wireless charging prototype can transfer 5 W to the small-sized receiver in around 350 mm × 225 mm × 200 mm 3D charging area and achieve the highest efficiency of 77.9%.

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