Abstract
The wireless power transfer (WPT) method for electric vehicles (EVs) is becoming more popular, and to ensure the interoperability of WPT systems, the Society of Automotive Engineers (SAE) established the J2954 recommended practice (RP). It includes powering frequency, electrical parameters, specifications, testing procedures, and other contents for EV WPT. Specifically, it describes the ranges of self-inductances of the transmitting coil, the receiving coil, and coupling coefficient (k), as well as the impedance matching values of the WPT system. Following the electrical parameters listed in SAE J2954 RP is crucial to ensure the EV wireless charging system is interoperable. This paper introduces a method for adjusting the effective permeability of the ferrite blocks in the standard model, to tune the self-inductance of the coils as well as the coupling coefficient. To guarantee the given values of the self-inductance of the coil and coupling coefficient matched those in the standard, we slightly modified the air-gap between the ferrite tiles in a specific region. Based on this method, it was possible to successfully tune the self-inductance of the transmitting coil and receiving coil as well as the coupling coefficient. The proposed method was verified by simulation and experimental measurements.
Highlights
Electric vehicles (EVs) are increasingly popular, and as their technology continuously advances, they are becoming an essential part of transportation networks
We introduce an air-gap adjusting method to control the effective permeability of ferrite tiles so that the LGA and LVA values can be effectively fine-tuned
The proposed concept was verified with simulations and experimental measurements based on an Society of Automotive Engineers (SAE) J2954 recommended practice (RP) test bench
Summary
Electric vehicles (EVs) are increasingly popular, and as their technology continuously advances, they are becoming an essential part of transportation networks. It describes the specific dimensions for ground assembly (GA) and vehicle assembly (VA) components, including the power transmitting coil (GA Coil) and receiving coil (VA Coil), respectively It includes the ranges of inductances of the GA Coil (LGA ), and VA Coil (LVA ), and coupling coefficient (k), as well as the impedance matching values of the WPT system. To set the LGA and LVA values within intended ranges, we slightly adjust the air-gap lengths between the ferrite tiles in a specific region Since these air-gap lengths are not described in the standard, it is reasonable to tune these values to control the inductances of the GA and VA coils. The proposed concept was verified with simulations and experimental measurements based on an SAE J2954 RP test bench
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