Digital autotuning controller for point-of-load converter based on non-intrusive start-up transient observer

M. Ali, Ka Hong Loo, Y. M. Lai

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


A new method for online estimation of power-stage parameters and autotuning of feedback controller for point-of-load (POL) converter is presented in this paper. The autotuning controller presented has been specifically developed to handle wide variations of the resonant frequency of LoCooutput filter and the equivalent series resistance (ESR) zero of output capacitor. The resonant frequency of LoCooutput filter and the time constant of output capacitor's ESR zero are estimated by examining the start-up transient response of converter and online measurement of steady-state output voltage ripple, respectively, hence the proposed method is non-intrusive and does not affect converter's normal operation. Based on these results, digital compensator is automatically tuned based on some user defined phase margin and crossover frequency to provide the desired transient response and output voltage regulation over wide variations of power-stage parameters. Simulation and experimental results from a 12 V-to-1.5 V, 22.5 W, 500 kHz digitally controlled POL buck converter are provided to verify the effectiveness of the proposed method.
Original languageEnglish
Title of host publicationECCE 2016 - IEEE Energy Conversion Congress and Exposition, Proceedings
ISBN (Electronic)9781509007370
Publication statusPublished - 1 Jan 2016
Event2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016 - Milwaukee, United States
Duration: 18 Sep 201622 Sep 2016


Conference2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016
Country/TerritoryUnited States


  • autotuning
  • Buck converter
  • digital control
  • online identification
  • type III digital compensator

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Control and Optimization

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