TY - GEN
T1 - Sensorless estimation of coupling coefficient based on current and voltage harmonics analysis for wireless charging system
AU - Mohammad, Mostak
AU - Choi, Seungdeog
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/11/3
Y1 - 2017/11/3
N2 - In this digest, a coupling coefficient estimation method for wireless charging system is proposed based on its transmitter and receiver current and voltage harmonics analysis. One of the main challenges of wireless charging in vehicular application is the significant variation of magnetic coupling coefficient between transmitter (Tx) and receiver (Rx) coils due to large air-gap and lateral misalignment. As that air-gap and alignment varies, the characteristics of the system and its optimal operating point changes and the control system needs to adapt to that changes. That requires to estimate the coupling coefficient in a fast and simple method. The variation of the coupling coefficient affects harmonics characteristics of the inductor current and capacitor voltage. Therefore, from those harmonics characteristics, the coupling coefficing can be estimated. The proposed estimation method is based on these harmonics analysis and it is comparatively faster than the traditional methods using multiple signal, or both transmitter and receiver side signal and wireless communication between them. In this digest, a detailed relation between coupling coefficient and transmitter and receiver side current and voltage harmonics is given analytically. Finally, the proposed method to estimate the coupling coefficient is verified through simulation and experimental setup for a 3.3kW wireless charger under static charging for different misalignment conditions.
AB - In this digest, a coupling coefficient estimation method for wireless charging system is proposed based on its transmitter and receiver current and voltage harmonics analysis. One of the main challenges of wireless charging in vehicular application is the significant variation of magnetic coupling coefficient between transmitter (Tx) and receiver (Rx) coils due to large air-gap and lateral misalignment. As that air-gap and alignment varies, the characteristics of the system and its optimal operating point changes and the control system needs to adapt to that changes. That requires to estimate the coupling coefficient in a fast and simple method. The variation of the coupling coefficient affects harmonics characteristics of the inductor current and capacitor voltage. Therefore, from those harmonics characteristics, the coupling coefficing can be estimated. The proposed estimation method is based on these harmonics analysis and it is comparatively faster than the traditional methods using multiple signal, or both transmitter and receiver side signal and wireless communication between them. In this digest, a detailed relation between coupling coefficient and transmitter and receiver side current and voltage harmonics is given analytically. Finally, the proposed method to estimate the coupling coefficient is verified through simulation and experimental setup for a 3.3kW wireless charger under static charging for different misalignment conditions.
KW - Coupling coefficient
KW - Inductive charging
KW - Magnetic coupling
KW - Misalignment
KW - Mutual inductance
KW - Wireless power transfer
UR - http://www.scopus.com/inward/record.url?scp=85041435793&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2017.8096517
DO - 10.1109/ECCE.2017.8096517
M3 - Conference contribution
AN - SCOPUS:85041435793
T3 - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
SP - 2767
EP - 2772
BT - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
Y2 - 1 October 2017 through 5 October 2017
ER -