Dual Inductor Hybrid Converter for Point-of-Load Voltage Regulator Modules

Gabsu Seo, Ratul Das, Hanh-Phuc Le

Research output: Contribution to journalArticlepeer-review

39 Scopus Citations


Achieving high-efficiency power conversion with high power density for a large conversion ratio is crucially needed yet challenging in point-of-load applications because of increasing demands of loads. This article presents a new hybrid converter to address this need. The converter uses two interleaved inductors for complete soft charging of flying capacitors to provide high output currents with no capacitor hard-charge loss. This dual inductor hybrid (DIH) converter features a smaller number of switches and more effective switch utilization than a recently reported hybrid Dickson converter, yielding substantially less switch losses represented by smaller volt-ampere products and smaller equivalent output resistance. Converter operation principle is analyzed in detail to confirm the feasibility and benefits, and design considerations are provided to identify a practical design process. Experimental results verify the converter's operation principles and advantages with a 300-kHz 20-W prototype achieving 95.02% peak efficiency and 225-W/in3 power density. The converter's advantages and performance make the point-of-load converter architecture a good candidate for demanding applications, such as in data centers, telecommunications, and high-performance digital systems.

Original languageAmerican English
Article number8840887
Pages (from-to)367-377
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number1
StatePublished - 1 Jan 2020

Bibliographical note

Publisher Copyright:
© 1972-2012 IEEE.

NREL Publication Number

  • NREL/JA-5D00-74628


  • GaN devices
  • hybrid converter
  • inductor current sharing
  • point-of-load
  • power density
  • soft charging
  • switched-capacitor converter


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