EPE  Vol.5 No.3 B , May 2013
An Analysis of Buck Converter Efficiency in PWM/PFM Mode with Simulink
Abstract: This technical paper takes a study into efficiency comparison between PWM and PFM control modes in DC-DC buck converters. Matlab Simulink Models are built to facilitate the analysis of various effects on power loss and converting efficiency, including different load conditions, gate switching frequency, setting of voltage and current thresholds, etc. From efficiency vs. load graph, a best switching frequency is found to achieve a good efficiency throughout the wide load range. This simulation point is then compared to theoretical predictions, justifying the effectiveness of computer based simulation. Efficiencies at two different control modes are compared to verify the improvement of PFM scheme.
Cite this paper: C. Peng and C. Wang, "An Analysis of Buck Converter Efficiency in PWM/PFM Mode with Simulink," Energy and Power Engineering, Vol. 5 No. 3, 2013, pp. 64-69. doi: 10.4236/epe.2013.53B013.

[1]   J. D. Chen, “Determine Buck Converter Efficiency in PFM Mode,”2007.

[2]   A. Harry, E. Robert and M. Dragan “DC-DC Converter Design for Battery-Operated Systems,” 26th Annual IEEE Power Electronics Specialists Conference, CO 80309-0425 USA, 1998.

[3]   S. Donald and C. Jorge, “Buck-Converter Design Demystified,”California, 2006.

[4]   “LM3677 3MHz, 600mA Miniature Step down DC-DC Converter for Ultra Low Voltage Circuits National Semiconductor,” Vol. 7, 2007.

[5]   K. B. Naima, C. Wen, A. Prashant and J. Elec Electron, “FPGA-Based Combined PWM-PFM Technique to Control DC-DC Converters in Portable Devices,” Vol. 1, p. 102. doi:10.4172/2167-101X.1000102

[6]   M. Rahimi, P. Parviz, and A. Peyman, “Application Note AN-1162 Compensator Design Procedure for Buck Converter with Voltage-Mode Error-Amplifier,”

[7]   K. Saurabh, “Analysis, Design and Modeling of Dc-Dc Converter Using Simulink,” 2004.

[8]   P. Jeff, “An Efficient Frequency Controlled PFM for DC-DC Converters,” Electronic Theses and Dissertations Theses, Vol. 29, 2010.