Work

Analysis of Capacitive Impedance Matching Networks for Simultaneous Wireless Power Transfer to Multiple Devices

Year: 2014

Type: article

Abstract: This paper presents wireless power transfer (WPT) characteristics according to load variation in multidevice WPT systems using capacitive impedance matching networks (IMNs). Two basis IMNs of using series-parallel (SP) capacitors and parallel-series (PS) capacitors are used. Four combinations of capacitive IMNs are considered, i.e., SP in a transmitting side and SP in a receiving (Rx) side (SP-SP), SP-PS, PS-SP, and PS-PS. The optimum capacitance values for each IMN are also derived by circuit analysis. For verification, three cases based on the number of Rx coils are considered, and the calculated results are compared with the simulated and measured results for each case. A WPT system for only a single device has identical power transfer efficiency for four combinations of the IMNs. Multidevice WPT systems with the PS IMN in Rx sides are found to transfer more power toward the Rx coil with lower load impedance according to the load variation. On the other hand, using the SP IMN in Rx sides is less sensitive to load variation than using the PS IMN. In addition, a WPT system using the PS-PS IMN combination is less responsive to the cross coupling between Rx coils than that using the SP-SP IMN combination.

Source: IEEE Transactions on Industrial Electronics

DOI: 10.1109/tie.2014.2365751

Authors: Jinwook Kim, Do-Hyeon Kim, Young-Jin Park

Institutions: Shin Ansan University, Korea Electrotechnology Research Institute, Korea University of Science and Technology

Language: English

Topic: Wireless Power Transfer Systems

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: bronze

Funders: Ministry of Science, ICT and Future Planning, Korea Electrotechnology Research Institute