Adaptive Self-Tuned Mixed-Signal Controller IC for Resonant Wireless Power Transfer

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2 Scopus citations

Abstract

This paper introduces an adaptive self-tuned controller IC for resonant wireless power transfer (RWPT) systems. The new controller IC comprises an on-the-fly very-high-frequency tracking hardware with high-resolution and an independent high-resolution digital PWM-based (HR-DPWM) current programmed control. These facilitate precise frequency generation as well as adaptive tuning of the reactive components in the matching network, which translate into tight current/power regulation capabilities while retaining optimized power transfer conditions. This enables to effectively disengage the power delivery capabilities from the variations of the resonators, electrical circuits and wireless medium. A fully synthesizable digital two-loop controller has been realized through HDL tools, and several new IP blocks have been developed and described in-detail: a delay-line (DL) based phase detector, high-resolution digital controlled oscillator (DCO), HR-DPWM. To fully exploit the benefits of digital electronics, reduce power consumption and save area, the digital core of the controller has been designed through asynchronous architecture, eliminating the need of high-speed clock and its related architecture. The mixed-signal controller IC has been designed and implemented in 0.18 μm, resulting in total effective silicon area of 1.44 mm2. Post-layout results of the fabricated IC operating in closed-loop are provided, demonstrating the performance and benefits of the new controller for meeting the requirements of resonant-based WPT systems. In addition, to validate and verify the controller core prior to IC fabrication, the control algorithm has been implemented on FPGA. To demonstrate closed-loop operation of a wireless power system, an experimental LC resonant capacitive-based WTP system has been constructed. The effectiveness of the controller is well demonstrated and evaluated at the MHz range up to an airgap of 200 mm, validating adaptive self-tuned system.

Original languageEnglish
Title of host publicationAPEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages805-812
Number of pages8
ISBN (Electronic)9781728148298
DOIs
StatePublished - 1 Mar 2020
Event35th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2020 - New Orleans, United States
Duration: 15 Mar 202019 Mar 2020

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2020-March

Conference

Conference35th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2020
Country/TerritoryUnited States
CityNew Orleans
Period15/03/2019/03/20

Keywords

  • adaptive controller IC
  • closed-loop wireless system
  • impedance matching
  • resonant power transfer
  • selftuned system
  • variable inductance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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