A 1-MHz Resonant LED Driver with Charge-Pump-Based Power Factor Correction

Ahmed Morsi Ammar, Frederik Monrad Spliid, Yasser Nour, Arnold Knott

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Abstract

This paper presents the design and implementation of a resonant LED driver. The driver structure comprises a charge-pump-based power factor correction (PFC) converter and a class-DE dc-dc converter. The PFC converter employs a charge-pump circuit that achieves PFC inherently. The class-DE converter comprises a series-resonant tank and a high-frequency transformer. Both converters share the same half-bridge and gate-driving circuit, resulting in an integrated-stage architecture. The inherent PFC operation limits the controller responsibility to the regulation of the output current. The overall converter operates with zero-voltage switching (ZVS) across the entire load range, allowing for increased switching frequencies with reduced switching losses. A 1-MHz prototype employing wide bandgap (WBG) switching devices is built and tested. The prototype delivers up to 42 W of output power, with a power density of 1.8 W/cm3. A power factor of 0.99 and a total harmonic distortion (THD) of 6 % are achieved, with an efficiency of 90 % at full load. The input current harmonic magnitudes are well-within the IEC 61000-3-2 standard limits for class-C devices. Burst-mode (on/off) modulation is used for output current regulation between 20 and 900 mA for dimming functionality.
Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Number of pages13
ISSN2168-6777
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • LED drivers
  • Power factor correction
  • Resonant power conversion
  • Charge pump
  • Zero-voltage switching

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