Abstract

Capacitive wireless power transfer can be realized by mutually coupled capacitors operating at a common resonant frequency. An optimal load exists that maximizes either the efficiency or the power transfer to the load. In this work, we utilize the frequency bifurcation effect to propose a frequency agile mode that allows for a nearly coupling-independent regime. We analytically determine the operating conditions of the coupling-independent mode based on the different system gains. In this way, we obtain a solution that achieves nearly constant efficiency and power transfer, even at varying coupling. We compare our results to inductive wireless power transfer where a perfect coupling-independent mode is achievable.

Highlights

  • Wireless power transfer (WPT) allows energy transfer from a transmitter to a receiver across an air gap, without any electrical connections [1,2]

  • WPT is especially important for biomedical implants such as pacemakers [5], neurostimulators [6] and spinal cord stimulators [7]

  • We study the fundamental design for achieving a capacitive wireless power transfer (CPT) link that is independent of the coupling between transmitter and receiver by using a frequency agile approach

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Summary

Introduction

Wireless power transfer (WPT) allows energy transfer from a transmitter to a receiver across an air gap, without any electrical connections [1,2]. Any device that needs power can become an application for WPT. The current list of applications where WPT is applied, is very diverse [3,4]. Most known WPT applications are portable electronics and household devices (e.g., smartphones, electric toothbrushes, wearables, smart watches). WPT is especially important for biomedical implants such as pacemakers [5], neurostimulators [6] and spinal cord stimulators [7]

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