Optimal Design of a Hybrid Winding Structure for Planar Contactless Battery Charging Platform

Abstract

Planar contactless battery charging platform is an emerging technology that has the potential of unifying the charging protocols of portable consumer electronic products. In this paper, a new hybrid structure which consists of a coil and a spiral winding is proposed for improving the uniform magnetic field distribution over the charging surface. An analysis into an optimal design of the number of turns and the dimension of the spiral winding is presented for a given concentrated coil. The uniform magnetic field distribution of the designed prototype is measured by an EMC scanner and by an energy-receiving coil. Based on circuit modeling and analysis, the inverter circuit topology and particularly the resonant compensation tank is designed for maximizing power transfer for multi-load applications. A design procedure is proposed and verified by the experiments. An efficiency of about 80% has been achieved for the coupling structure itself when four loads are charged on the platform simultaneously.

Research on Efficiency of Contactless Charging System based on Electromagnetic Induction

“…In abroad, Professor Boys's research team design out of the device for the power supply of electric vehicle in the harsh environment [3] [4], its transmission efficiency is up to 75%;The inductive contactless charging system of Magne-charge speed up the popularization and application of electric vehicle by effectively overcome the shortcomings of repeatedly plug and wire exposed [5]; Society of Automotive Engineers developed recommended practice for electric vehicle charging by use of inductive electric energy transmission technology in North America [6].Compared with foreign countries, the domestic research is late in the radio transmission filed, part of the domestic universities and research institutions have done a lot of work in the basic theory and application [7]- [9], [14][15], the present research focused on the control strategy and system design [10]- [14],the research on ICPT technology is worth mentioning, which is done by City University of Hong Kong and they mainly excogitate a general contactless charging platform [15]- [17], however the research aiming at power wireless transmission efficiency problem is seldom. This paper uses Matlab/Simulink to establish the contactless charging system model to simulate the actual work frequency, coil distance change and load change condition and simulation, through regulation of PWM generator frequency, mutual inductor value, RL value of the load to research the frequency, load and mutual inductance coefficient effect on electromagnetic inductive contactless charging, verify the mathematical model deduced theory and proved the method of improve working efficiency.…”

Analysis and Application of Compact Planar Multi-Loop Self-Resonant Coil of High Quality Factor with Coaxial Cross Section

“…특 히, 태블릿 PC, 랩탑, 스마트폰 등과 같은 소형 전자 기기의 무선 충전용으로 많은 연구가 이루어지고 있 다 [3]～ [5] . 이러한 소형 전자기기 충전 시스템에서 전 력 전송 효율을 높이기 위해서는 높은 품질 계수를 갖는 공진 코일의 설계, 상호 결합 계수 증대, 그리 고 공진 주파수의 조절이 매우 중요하다.…”

“…또한, 다양 한 가전기기에 적용할 수 있도록 공진 코일이 소형 화 되어야 한다. 지금까지 공진형 무선 전력 전송 시스템을 위해 여러 종류의 자기 공진 코일이 제시되었다 [1], [3]～ [7] .…”

A bidirectional wireless power transfer system for an electric vehicle with a relay circuit

“…The wireless power transfer (WPT) system based on the inductive coupled power transfer (ICPT) technique can transmit electric energy from the power sources to the loads without any wires between the two sides, which offers advantages in terms of flexibility, reliability, and safety [1][2][3][4]. Therefore, it has been gaining popularity and is widely used in some special fields, including household appliances, implanted biomedical sensors for organs, underwater charging, and online electric power supply [5][6][7][8].…”