A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers

Lin Fan*, Arnold Knott, Ivan Harald Holger Jørgensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Previous research on switched-capacitor DC-DC converters has focused on low-voltage and/or high-power ranges where the efficiencies are dominated by conduction loss. Switched-capacitor DC-DC converters at high-voltage (> 100 V) low-power (< 10 W) levels with high efficiency and high power density are anticipated to emerge. This paper presents a switched-capacitor converter with an input voltage up to 380 V (compatible with rectified European mains) and a maximum output power of 10 W. GaN switches and SiC diodes are analytically compared and actively combined to properly address the challenges at high-voltage low-current levels, where switching loss becomes significant. Further trade-off between conduction loss and switching loss is experimentally optimized with switching frequencies. Three variant designs of the proposed converter are implemented, and the trade-off between the efficiency and the power density is validated with measurement results. A peak efficiency of 98.6% and a power density of 7.5 W/cm3 are achieved without heatsink or airflow.The characteristic impedance level of the switched-capacitor converter is an order of magnitude higher than previously published ones. The converter is intended for LED drivers.
Original languageEnglish
JournalElektronika ir Elektrotechnika
Volume24
Issue number3
Pages (from-to)33-40
Number of pages8
ISSN1392-1215
DOIs
Publication statusPublished - 2018

Keywords

  • DC-DC power converters
  • Gallium nitride
  • Silicon carbide
  • Switched capacitor circuits
  • Wide band gap semiconductors

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