LLC resonant converter burst mode control with constant burst time and optimal switching pattern
- 1 March 2011
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE) in 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Abstract
In this paper, a novel burst mode control solution for LLC resonant converters is proposed for the highest efficiency and small output voltage ripple. The burst time is set to be constant, the off time is modulated by load conditions. During the burst time, three pulse switching pattern is implemented to keep output voltage low frequency ripple minimal. The switch first turned on is controlled to be last turned off to reduce the initial hard switching turn on loss when burst starts. The pulse width of first switch is optimized to settle LLC to the steady-state under the highest efficiency load condition in one pulse. Zero current detection (ZCD) of the resonant current is implemented to achieve first switch partial ZVS, further increasing light load efficiency.Keywords
This publication has 9 references indexed in Scilit:
- Digital implementation of driving scheme for synchronous rectification in LLC resonant converterPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2010
- Light-Load Efficiency Optimization MethodIEEE Transactions on Power Electronics, 2009
- Light-Load Efficiency Improvement for Buck Voltage RegulatorsIEEE Transactions on Power Electronics, 2009
- Analysis and Implementation of LLC Burst Mode for Light Load Efficiency ImprovementPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2009
- Power architecture design with improved system efficiency, EMI and power density2008 IEEE Power Electronics Specialists Conference, 2008
- Standby Mode Control Circuit Design of LLC Resonant ConverterPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- Implementation of optimal trajectory control of series resonant converterIEEE Transactions on Power Electronics, 1988
- Resonant Power Processors, Part II-Methods of ControlIEEE Transactions on Industry Applications, 1985
- Resonant Power Processors, Part I---State Plane AnalysisIEEE Transactions on Industry Applications, 1985