Constant current charging for variable load employing secondary side controlled wireless charging system

2017 ◽  
Author(s):  
Zhenjie Li ◽  
Kai Song ◽  
Chunbo Zhu ◽  
Rengui Lu ◽  
Guo Wei
Keyword(s):  
Constant Current ◽  
Variable Load ◽  
Wireless Charging ◽  
Charging System ◽  
Constant Current Charging ◽  
Secondary Side

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.

Multi-load constant current charging technology for wireless charging system

2020 ◽  
Vol 107 (8) ◽  
pp. 1254-1271
Author(s):  
Zhang Zhang ◽  
Zhou Xiaojuan ◽  
Xie Yulei ◽  
Xie Guangjun ◽  
Cheng Xin
Keyword(s):  
Constant Current ◽  
Wireless Charging ◽  
Charging System ◽  
Constant Current Charging

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.

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%.

Design of Cleaning Robot Autonomous Charging System

2013 ◽  
Vol 722 ◽  
pp. 497-502 ◽  
Author(s):  
Dong Qi Han ◽  
Jin Li
Keyword(s):  
Constant Current ◽  
Charging System ◽  
Charging Station ◽  
Hardware System ◽  
Cleaning Robot ◽  
Charging Current ◽  
Position Coding ◽  
Cleaning Robots ◽  
Constant Current Charging ◽  
Hardware Circuit

A system of cleaning robots independent charge containing hardware system and software system is designed. The hardware circuit of charging station includes a power supply circuit, the battery constant current charging circuit of charging current which can be regulated by the hardware and software, position coding signal transmitting circuit. This paper also presents a new independent charging algorithm that the robot can search automatically charging station using the random walk model in unknown environment, so that the robot have the ability to find independently the charging station. The results show that the cleaning robot can complete automatic charging, and the success rate is 100%.

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 Constant-Current and Constant-Voltage Output for Single-Switch WPT System with Composite Shielding Structure

2021 ◽  
Vol 13 (1) ◽  
pp. 13
Author(s):  
Quanlei Zhang ◽  
Chunfang Wang ◽  
Lingyun Yang ◽  
Zhihao Guo
Keyword(s):  
Shielding Effect ◽  
Constant Current ◽  
Maximum Efficiency ◽  
Wireless Charging ◽  
Constant Voltage ◽  
Wireless Power ◽  
Zero Voltage Switching ◽  
Charging System ◽  
The Stability ◽  
Zero Voltage

With the development of wireless power transfer (WPT), the wireless charging has become a research hotspot. This paper proposes a novel single-switch hybrid compensation topology, which can change the compensation network to realize the constant-current (CC) and constant-voltage (CV) output. The zero voltage switching (ZVS) margin can be designed to increase the stability of the system. In addition, the magnetic coupler adopts a composite shielding structure composed of ferrite, nanocrystalline, and aluminium foil. The composite shielding structure has a better shielding effect on magnetic flux leakage, and its weight is lighter. The composite shielding structure is expected to be used in the wireless charging system of electric vehicles (EVs). Finally, an experimental prototype is built to verify the theoretical analysis, and the maximum efficiency can reach 91.4%.

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