Cost‐effective inductive power transfer charging system for electric bicycles with variable charging current using primary‐side detuned series‐series topology

2019 ◽  
Vol 13 (9) ◽  
pp. 1378-1386
Author(s):  
Yang Chen ◽  
Mingxuan Li ◽  
Zhihao Kou ◽  
Zhengyou He ◽  
Ruikun Mai
Keyword(s):  
Cost Effective ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Charging System ◽  
Charging Current ◽  
Electric Bicycles ◽  
Inductive Power

Using Sensing Coils to Detect and Correct Lateral Misalignments in an Inductive Power-Transfer Wireless Charging System

2017 ◽  
Author(s):  
Ivan Cortes ◽  
Won-jong Kim
Keyword(s):  
Consumer Products ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Inductive Power Transfer ◽  
Charging System ◽  
Field Symmetry ◽  
Electrical Transformers ◽  
Efficient Power ◽  
Inductive Power

Inductive power transfer (IPT) remains one of the most common ways to achieve wireless power transfer (WPT), operating on the same electromagnetic principle as electrical transformers but with an air core. IPT has recently been implemented in wireless charging of consumer products such as smartphones and electric vehicles. However, one major challenge with using IPT remains ensuring precise alignment between the transmitting and receiving coils so that maximum power transfer can take place. In this paper, the use of additional sensing coils to detect and correct lateral misalignments in an IPT systems is modeled and tested. The sensing coils exploit magnetic-field symmetry to give a nonlinear measure of misalignment direction and magnitude. Experiments using such sensing coils give a misalignment-sensing resolution of less than 1 mm when applied to a common smartphone wireless charging system. Voltage readings from the sensing coils are used for feedback control of an experimental two-dimensional coil positioner. This system is able to reduce lateral misalignments to less than 2 mm in real time, allowing for efficient power transfer. The results of this experiment give confidence that similar sensing coils can be used to reduce lateral misalignments in scaled IPT systems, such as electric-vehicle wireless chargers.

scholarly journals A brief review: basic coil designs for inductive power transfer

2020 ◽  
Vol 20 (3) ◽  
pp. 1703
Author(s):  
Nadia Nazieha Nanda ◽  
Siti Hajar Yusoff ◽  
Siti Fauziah Toha ◽  
Nurul Fadzlin Hasbullah ◽  
Amelia Shafina Roszaidie
Keyword(s):  
Power Transmission ◽  
Transmission Efficiency ◽  
Power Transfer ◽  
Spiral Coil ◽  
Inductive Power Transfer ◽  
Design Concepts ◽  
Charging System ◽  
Coil Geometry ◽  
Dynamic Charging ◽  
Inductive Power

The inductive power transfer (IPT) has contributed to the fast growth of the electric vehicle (EV) market. The technology to recharge the EV battery has attracted the attention of many researchers and car manufacturers in developing green transportation. In IPT charging system, the coil design is indispensable in enhancing the EV battery charging process performance. This paper starts by describing the two charging techniques; static charging and dynamic charging before further presents the IPT system descriptions. Afterwards, this paper describes a brief review of coil designs which discusses the critical factors that affect the power transmission efficiency (PTE) including their basic designs, design concepts and features merits. The discussions on the basic coil designs for IPT are of the circular spiral coil (CSC), square coil (SC), rectangular coil (RC), and double-D coil (DDC). Furthermore, the significant advantages and limitations of each research on different geometries are analyzed and discussed in this paper. Finally, this paper evaluates some essential aspects that influence the coil geometry designs in practical.

scholarly journals Light-Load Efficiency Optimization for an LCC-Parallel Compensated Inductive Power Transfer Battery Charger

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2080
Author(s):  
Shuangcheng Yang ◽  
Xiangtian Deng ◽  
Jianghua Lu ◽  
Zhixuan Wu ◽  
Kai Du
Keyword(s):  
Power Converter ◽  
Constant Current ◽  
Power Transfer ◽  
Battery Charger ◽  
Battery Charging ◽  
Inductive Power Transfer ◽  
Efficiency Optimization ◽  
Charging System ◽  
Light Load ◽  
Inductive Power

Wireless power transfer (WPT) techniques have gained wide acceptance across a range of battery charging applications such as cell phones, cardiac pacemakers, and electric vehicles. In a wireless battery charging system, a constant current/constant voltage (CC/CV) charging strategy, regardless of the variation of the battery load which may roughly range from a few ohms to several hundred ohms, is typically adopted to ensure the safety, durability, and performance of the battery. However, system efficiency drops significantly as the load increases in CV mode, especially at very light-load conditions. This paper proposes an efficiency optimization method for an LCC-parallel compensated inductive power transfer (IPT) battery charging system without the help of any additional power converter and control method. The equivalent circuit and resonant conditions of the LCC-parallel compensation topology are firstly analyzed to achieve the load-independent CV output at a zero phase angle (ZPA) operating frequency. Over the full range of CV charging mode, the efficiency of the LCC-parallel resonant tank circuit is analyzed and optimized. An IPT battery charger prototype with 48 V charging voltage and 1 A charging current is implemented. A measured DC–DC transfer efficiency of greater than 90.48% is achieved during the whole CV charging profile.

Sign in / Sign up

Export Citation Format

Share Document