Title :
A VHF interleaved self-oscillating resonant SEPIC converter with phase-shift burst-mode control
Author :
Kovacevic, Mladen ; Knott, Arnold ; Andersen, Michael A. E.
Author_Institution :
Dept. of Electr. Eng., Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
This paper presents design and implementation of the phase-shift burst-mode control method for interleaved self-oscillating resonant SEPIC converters for LED lighting applications. The proposed control method utilizes delays in the turn-on and turn-off of the power stage and control circuitry in order to reduce requirements for the comparator in the regulation circuit. The control method is experimentally evaluated on a 49 MHz dc-dc converter prototype, and the results are presented. The designed converter demonstrates peak efficiency of 81%, maintains efficiency above 75% from 20% load to full load, and is implemented using low-cost switches and integrated circuits.
Keywords :
DC-DC power convertors; comparators (circuits); light emitting diodes; lighting; resonant power convertors; switches; LED lighting; SEPIC converter; VHF interleaved self-oscillating resonant converter; comparator; control circuitry; dc-dc converter; frequency 49 MHz; integrated circuits; low-cost switches; phase-shift burst-mode control; power stage; regulation circuit; Capacitance; Delays; Frequency modulation; Integrated circuit modeling; Radio frequency; Voltage measurement;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803490
