Invention Grant
- Patent Title: Multi-modular capacitive wireless power transfer circuit and related techniques
-
Application No.: US16636211Application Date: 2018-08-01
-
Publication No.: US11502542B2Publication Date: 2022-11-15
- Inventor: Khurram K Afridi , Brandon Regensburger , Sreyam Sinha , Ashish Kumar , Zoya Popovic
- Applicant: The Regents of the University of Colorado
- Applicant Address: US CO Denver
- Assignee: The Regents of the University of Colorado
- Current Assignee: The Regents of the University of Colorado
- Current Assignee Address: US CO Denver
- Agency: FisherBroyles, LLP
- Agent Thomas J. Osborne, Jr.
- International Application: PCT/US2018/044879 WO 20180801
- International Announcement: WO2019/028180 WO 20190207
- Main IPC: H02J50/05
- IPC: H02J50/05 ; H02J50/40 ; B60L53/122 ; H03H7/38

Abstract:
A high performance kilowatt-scale large air-gap multi-modular capacitive wireless power transfer (WPT) system is provided for electric vehicle (EV) charging. In one particular implementation, the multi-modular system achieves high power transfer while maintaining fringing electric fields within prescribed safety limits. The fringing fields are reduced using near-field phased-array field-focusing techniques, wherein the adjacent modules of the multi-modular system are out-phased with respect to one another. The inter-module interactions in this multi-modular system can be modeled, and an approach to eliminate these interactions in a practical EV charging environment is provided. To illustrate one example implementation, a prototype 1.2-kW 6.78-MHz 12-cm air-gap multi-modular capacitive WPT system comprising two 600-W modules is provided. This prototype system achieves 21.2 kW/m2 power transfer density and a peak efficiency of 89.8%. This multi-modular system also achieves a fringing field reduction of 50% compared to its individual modules.
Public/Granted literature
- US20200373783A1 MULTI-MODULAR CAPACITIVE WIRELESS POWER TRANSFER CIRCUIT AND RELATED TECHNIQUES Public/Granted day:2020-11-26
Information query