TY - GEN
T1 - Development of a Wireless Power Supply System for an E-Bike
AU - Lee, Jaehong
AU - Lee, Sangmin
AU - Kwak, Myeongseok
AU - Yeom, Gyeonghoon
AU - Lee, Seung Hwan
N1 - Publisher Copyright:
© 2019 The Korean Institute of Power Electronics (KIPE).
PY - 2019/5
Y1 - 2019/5
N2 - A wireless power transfer system for an electric bicycle was investigated in this study. Loosely coupled transmitter and receiver coils that are designed for an installation on a rack and a bike wheel were developed. Achieving required mutual inductance with compact size and light weight coils was the goal of the system design. To achieve the requirements, the transmitter and receiver coils were wound in a ferrite pot-core that increases coils' self-inductances and confines magnetic flux to prevent coupling with a bike wheel and a rack. Using finite element analysis, the dependence of the quality factor and self-inductance of a coil design methodology using the ferrite pot-core was studied in this paper. It was found that eddy-current loss of coils wound in a pot-core increased highly near the air-gap. To achieve a high quality factor, coil should be located as deep inside of the pot-core. On the other hand, coils' self-inductances decreased while coils were moved away from the air-gap. Also, mathematical analysis of a series-parallel compensated wireless power transfer system was studied. Stability margin, efficiency, and induced voltage were considered to optimize the load resistance. The proposed system was evaluated using an experimental test-bed. Measured coil-to-coil efficiency of the developed system was over 90 % and the overall efficiency was 73.2 % at its rated operation.
AB - A wireless power transfer system for an electric bicycle was investigated in this study. Loosely coupled transmitter and receiver coils that are designed for an installation on a rack and a bike wheel were developed. Achieving required mutual inductance with compact size and light weight coils was the goal of the system design. To achieve the requirements, the transmitter and receiver coils were wound in a ferrite pot-core that increases coils' self-inductances and confines magnetic flux to prevent coupling with a bike wheel and a rack. Using finite element analysis, the dependence of the quality factor and self-inductance of a coil design methodology using the ferrite pot-core was studied in this paper. It was found that eddy-current loss of coils wound in a pot-core increased highly near the air-gap. To achieve a high quality factor, coil should be located as deep inside of the pot-core. On the other hand, coils' self-inductances decreased while coils were moved away from the air-gap. Also, mathematical analysis of a series-parallel compensated wireless power transfer system was studied. Stability margin, efficiency, and induced voltage were considered to optimize the load resistance. The proposed system was evaluated using an experimental test-bed. Measured coil-to-coil efficiency of the developed system was over 90 % and the overall efficiency was 73.2 % at its rated operation.
KW - Battery charging
KW - Coil design
KW - E-bike wireless power transfer system
KW - Finite element analysis
KW - Pot-core
KW - Series-Parallel resonant
UR - http://www.scopus.com/inward/record.url?scp=85071645158&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85071645158
T3 - ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia
SP - 599
EP - 605
BT - ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 10th International Conference on Power Electronics - ECCE Asia, ICPE 2019 - ECCE Asia
Y2 - 27 May 2019 through 30 May 2019
ER -