Hybrid PFM-PWM Digital Controller for Miniaturized High-Frequency LLC Converters Integrated in Advanced IoT Devices

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper introduces a highly-miniaturized soft-switched power-supply suitable for IoT applications. It incorporates a half-bridge LLC resonant converter operating in the MHz range and a new hybrid PFM-PWM digital controller that facilitates tight output voltage regulation carried out through a simple voltage loop controller hardware. The switching frequency and the duty-ratio are adjusted simultaneously and with full continuity and monotonicity. Governed by two PI compensators to guarantee smooth and fast recovery from load-transient or input voltage aberrations the controller accounts for the non-monotonicity characteristics of asymmetrically driven LLC resonant converters. The operation of the controller is experimentally verified on a 3-7V input to 1.8V output HB-LLC converter, demonstrating tight output voltage regulation capabilities.

Original languageEnglish
Title of host publication2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics, COMPEL 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665410816
DOIs
StatePublished - 1 Jan 2022
Event23rd IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2022 - Tel-Aviv, Israel
Duration: 20 Jun 202223 Jun 2022

Publication series

NameProceedings of the IEEE Workshop on Computers in Power Electronics, COMPEL
Volume2022-June
ISSN (Print)1093-5142

Conference

Conference23rd IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2022
Country/TerritoryIsrael
CityTel-Aviv
Period20/06/2223/06/22

Keywords

  • LLC
  • PFM
  • PWM
  • digital controller
  • resonant converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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