Improved transient response using HFFC in current-mode CFCOT control for Buck converter

In this paper, improved transient response using high-frequency feedback control (HFFC) in current-mode constant frequency constant on-time (CFCOT) control for Buck converter is proposed. The concept uses HFFC to filter out the Vout at the load transient to dynamically change the width of on-time to prevent the Vout from dropping markedly. Finally, HFFC is implemented using the experimental results and SIMPLIS simulation results to verify its viability and superiority.

[1]  A.V. Peterchev,et al.  Digital Multimode Buck Converter Control With Loss-Minimizing Synchronous Rectifier Adaptation , 2006, IEEE Transactions on Power Electronics.

[2]  Jian Li,et al.  Current-Mode Control: Modeling and its Digital Application , 2009 .

[3]  Yu-Wei Chang,et al.  A novel ripple-based constant on-time control with virtual inductor current ripple for Buck converter with ceramic output capacitors , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[4]  Tore Undeland,et al.  Restructuring of first courses in power electronics and electric drives that integrates digital control , 2003 .

[5]  Ke-Horng Chen,et al.  Quadratic differential and integration technique in V2 control buck converter with small ESR capacitor , 2009, 2009 IEEE Custom Integrated Circuits Conference.

[6]  Fred C. Lee,et al.  Modeling of V2 Current-Mode Control , 2010, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[7]  Ned Mohan.  Power Electronic Circuits: An Overview , 1988, Proceedings.14 Annual Conference of Industrial Electronics Society.

[8]  Jian Li,et al.  New Modeling Approach and Equivalent Circuit Representation for Current-Mode Control , 2010, IEEE Transactions on Power Electronics.

[9]  Ke-Horng Chen,et al.  A new PWM/PFM control technique for improving efficiency over wide load range , 2008, 2008 15th IEEE International Conference on Electronics, Circuits and Systems.

[10]  Jian Sun,et al.  Ripple-Based Control of Switching Regulators—An Overview , 2009, IEEE Transactions on Power Electronics.

[11]  Jian Sun.  Characterization and performance comparison of ripple-based control for voltage regulator modules , 2006, IEEE Transactions on Power Electronics.

[12]  Ke-Horng Chen,et al.  Quadratic Differential and Integration Technique in $V^{2}$ Control Buck Converter With Small ESR Capacitor , 2010, IEEE Transactions on Power Electronics.

[13]  S. Angkititrakul,et al.  Design and analysis of buck converter with pulse-skipping modulation , 2008, 2008 IEEE Power Electronics Specialists Conference.