A High Efficiency Low-Voltage Soft Switching DC–DC Converter for Portable Applications

Amiri, P.; Sharafi, M.

doi:10.22061/jecei.2013.23

Document Type : Original Research Paper

Authors

Faculty of Electrical and Computer Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran.

https://doi.org/10.22061/jecei.2013.23

Abstract

This paper presents a novel control method to improve the efficiency of low-voltage DC-DC converters at light loads. Pulse Width Modulation (PWM) converters have poor efficiencies at light loads, while pulse frequency modulation (PFM) control is more efficient for the same cases. Switching losses constitute a major portion of the total power loss at light loads. To decrease the switching losses and to increase efficiency, converters based on soft-switching are utilized. This paper presents the design of a soft-switching DC-DC buck converter in a 90-nm CMOS technology. Simulation results by HSPICE shows a 21 mV output ripple on a 0.5 V output voltage for an input voltage of 1.4 V. Finally, the efficiency of 95% at a load current of 50 mA having 74 mA of current ripple is achievable.

Keywords

20.1001.1.23223952.2013.1.2.2.4

References

[1] S. Zhou and G. A. Rincon-Mora, “A high efficiency, soft switching dc–dc converter with adaptive current-ripple control for portable applications,” IEEE Trans. Circuits and Systems, vol. 53, no. 4, pp. 319–323, 2006.

[2] B. Razavi, Design of Analog CMOS Integrated Circuits, Boston, MA: McGraw-Hill, 2001.

[3] A. Stratakos, “High-Efficiency Low-Voltage DC-DC Conversion for Portable Applications,” PhD thesis, Berkeley Univ, 1999.

[4] W. R. Liou, M. L. Yeh, and Y. L. Kuo, “A High Efficiency DualMode Buck Converter IC for Portable Applications,” IEEE Trans. Power Electronics, vol. 23, no. 2, pp. 667-677, 2008.

[5] M. Brown, Practical switching power supply design, Academic Press, 1990.G. A. Rincón-Mora and B. Sahu, “An Accurate, LowVoltage, CMOS Switching Power Supply With Adaptive On

Time Pulse-Frequency Modulation (PFM) Control,” IEEE Trans. Circuits and Systems, vol. 54, no. 2, 2007.

[6] V. Yousefzadeh, N. Wang, and Z. P. D. Maksimovic, “A Digitally Controlled DC/DC Converter for an RF Power Amplifier,” IEEE Trans. Power Electronics, vol. 21, no. 1, pp. 164-172, 2006.

[7] Z. Bi and W. Xia, “Modeling and Simulation of Dual-Mode DC/DC Buck Converter,” Second International Conference on Computer Modeling and Simulation, 2010.

[8] Ch. L. Chen, W. L. Hsieh, K. J. Lai, K. H. Chen, and Ch. S. Wang, “A New PWM/PFM Control Technique for Improving Efficiency Over Wide Load Range,” 15th IEEE International Conference on Electronics, Circuits and Systems, 2008.

[9] Ch. Ch. Wang, Ch. L. Chen, G. N. Sung, and Ch. L. Wang, “A highefficiency DC–DC buck converter for sub-2_VDD power supply,” Microelectronics J, vol. 42, no. 5, pp. 709-717, 2011.

[10] D. Fernandez, “Modeling and Analysis of the Effects of PCB Parasitics on Integrated DC-DC Converters,” Master of Science thesis, California Polytechnic State Univ, 2011

LETTERS TO EDITOR

Journal of Electrical and Computer Engineering Innovations (JECEI) welcomes letters to the editor for the post-publication discussions and corrections which allows debate post publication on its site, through the Letters to Editor. Letters pertaining to manuscript published in JECEI should be sent to the editorial office of JECEI within three months of either online publication or before printed publication, except for critiques of original research. Following points are to be considering before sending the letters (comments) to the editor.

[1] Letters that include statements of statistics, facts, research, or theories should include appropriate references, although more than three are discouraged.

[2] Letters that are personal attacks on an author rather than thoughtful criticism of the author’s ideas will not be considered for publication.

[3] Letters can be no more than 300 words in length.

[4] Letter writers should include a statement at the beginning of the letter stating that it is being submitted either for publication or not.

[5] Anonymous letters will not be considered.

[6] Letter writers must include their city and state of residence or work.

[7] Letters will be edited for clarity and length.

Name *

Email Address *

Affiliation *

Comments *

Security Code *

Journal of Electrical and Computer Engineering Innovations (JECEI)

A High Efficiency Low-Voltage Soft Switching DC–DC Converter for Portable Applications

References

References

Send comment about this article

Volume 1, Issue 2 - Serial Number 2
July 2013
Pages 73-81

A High Efficiency Low-Voltage Soft Switching DC–DC Converter for Portable Applications

References

References

Send comment about this article

Volume 1, Issue 2 - Serial Number 2July 2013Pages 73-81

Volume 1, Issue 2 - Serial Number 2
July 2013
Pages 73-81