Browse > Article
http://dx.doi.org/10.6113/JPE.2010.10.2.115

A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter  

Rokhsat-Yazdi, Ehsan (Nanoelectronics Center of Excellence, School of Electrical and Computer Eng., University of Tehran)
Afzali-Kusha, Ali (Nanoelectronics Center of Excellence, School of Electrical and Computer Eng., University of Tehran)
Pedram, Massoud (Department of Electrical Engineering, University of Southern California)
Publication Information
Journal of Power Electronics / v.10, no.2, 2010 , pp. 115-124 More about this Journal
Abstract
In this paper, a simple yet efficient auto mode-hop ripple control structure for buck converters with light load operation enhancement is proposed. The converter, which operates under a wide range of input and output voltages, makes use of a state-dependent hysteretic comparator. Depending on the output current, the converter automatically changes the operating mode. This improves the efficiency and reduces the output voltage ripple for a wide range of output currents for given input and output voltages. The sensitivity of the output voltage to the circuit elements is less than 14%, which is seven times lower than that for conventional converters. To assess the efficiency of the proposed converter, it is designed and implemented with commercially available components. The converter provides an output voltage in the range of 0.9V to 31V for load currents of up to 3A when the input voltage is in the range of 5V to 32V. Analytical design expressions which model the operation of the converter are also presented. This circuit can be implemented easily in a single chip with an external inductor and capacitor for both fixed and variable output voltage applications.
Keywords
Auto Mode-Hop; Buck Converter; High-Efficiency; Ripple Control; Variable-Voltage;
Citations & Related Records

Times Cited By Web Of Science : 2  (Related Records In Web of Science)
Times Cited By SCOPUS : 1
연도 인용수 순위
1 K. D. T. Ngo, S. K. Mishra, and M. Walters, "Synthetic-ripple modulator for synchronous buck converter," IEEE Power Electronics Letters, Vol. 3, No. 4, pp. 148-151, Dec. 2005.   DOI   ScienceOn
2 T. Suntio, "Analysis and modeling of peak-current-mode-controlled buck converter in DICM," IEEE Trans. Industrial Electronics, Vol. 48, No. 1, pp.127-135, Feb. 2001.   DOI   ScienceOn
3 D. W. Kang, Y. B. Kim, and J. T. Doyle, "A high-efficiency fully digital synchronous buck converter power delivery system based on a finitestate machine," IEEE Trans. Very Large Scale Integration (VLSI), Vol. 14, No. 3, pp. 229-240, Mar. 2006.   DOI   ScienceOn
4 Barrado, A. $L\acute{a}zaro$, J. Pleite, R. $V\acute{a}zquez$, J. $V\acute{a}zquez$, and E. $Ol\acute{i}as$, "Linear-non-linear control (LnLc) for DC-DC buck converters: stability and transient response analysis," IEEE Int. Conf. Power Electronics, Vol. 2, pp. 1329-1335, Sep. 2004.
5 S.K. Baranwal, A. Patra, and B. Culpepper, "Self oscillating control of a synchronous DC-DC buck converter," IEEE Int. Conf. Power Electronics Specialists, Vol. 5, pp. 3671-3674, Jun. 2004.
6 P. Gupta and A. Patra, "Super-stable energy based switching control scheme for DC-DC buck converter circuits," IEEE, Vol. 4, pp. 3063- 3066, May 2005.
7 I. Kondratiev, E. Santi, R. Dougal, and G. Veselov, "Synergetic control for DC-DC buck converters with constant power load," IEEE Int. Conf. Power Electronics, Vol. 5, pp. 3758-3764, Jun. 2004.
8 M. Castilla, L. G. Vicuna, J.M. Guerrero, J. Matas, and J. Miret, "Design of voltage-mode hysteretic controllers for synchronous buck converters supplying microprocessor loads," IEE Proc.-Electr. Power Appl., Vol. 152, No. 5, pp. 1171-1178, Sep. 2005.   DOI   ScienceOn
9 W. Wang and G. Choi, "Minimum-energy LDPC decoder for real-time mobile application," EDAA Int. Conf. Design Automation and Test, pp. 343-348, 2007.
10 S. Zhou and G. A. Rinc?n-Mora, "A high efficiency, soft switching DCDC converter with adaptive surrent-ripple sontrol for portable applications," IEEE Trans. Circuits and Systems, Vol. 53, No. 4, pp. 319-323, Apr. 2006.   DOI   ScienceOn
11 K. Wong, "Output capacitor stability study on a voltage-mode buck regulator using system-poles approach," IEEE Trans. Circuits And Systems, Vol. 51, No. 8, pp. 436-441, Aug. 2004.   DOI   ScienceOn
12 A. Dancy and A. Chandrakasan, "Techniques for aggressive supply voltage scaling and efficient regulation," IEEE Int. Conf. Custom Integrated Circuits, pp. 579-586, 1997.
13 A. Prodic and D. Maksimovic, "Digital PWM controller and current estimator for a low-power switching converter," Proc. 7th Annu.Workshop Computers in Power Electronics, pp. 123-128, 2000.
14 B. Arbetter, R. Erickson, and D. Maksimovic, "DC-DC converter design for battery-operated systems," in Proc. 26th Annual IEEE Power Electronics Specialists Conf., Vol. 1, pp. 103-109, Jun. 1995.
15 C. H. Tso and J. C. Wu, "A ripple control buck regulator with fixed output frequency," IEEE Power Electronics Letters, Vol. 1, No. 3, pp. 61-63, Sep. 2003.   DOI   ScienceOn
16 M. Gildersleeve, H. P. Forghani-Zadeh, and G. A. Rinc?n-Mora, "A comprehensive power analysis and a highly efficient, mode-hopping dcdc converter," in Proc. IEEE Asia-Pacific Conf. ASIC, pp. 153-156, Nov. 2002.
17 K. H. Liu and F. C. Y. Lee, "Zero-voltage switching technique in DC/DC converters," IEEE Trans. Power Electronics, Vol. 5, No. 3, pp. 293-304, Jul. 1990.   DOI   ScienceOn
18 M. Wilcox and R. Flatness, "Control circuit and method for maintaining high efficiency over broad current ranges in a switching regulator circuit" U.S Patent 6,580,258, Jun. 17, 2003.
19 V. Vorperian, "Quasi-square-wave converters: topologies and analysis," IEEE Trans. Power Electronics, Vol. 3, No. 2, pp. 183-191, Apr. 1988.   DOI   ScienceOn
20 C. M. Wang, "Novel zero-voltage-transition PWM DC-DC converters," IEEE Trans. Industrial Electronics, Vol. 53, No. 1, pp. 254-262, Feb. 2006.   DOI
21 R. Oliva, S. S. Ang, and G. E. Bortolotto, "Digital control of a voltagemode synchronous buck Converter," IEEE Trans. Power Electronics, Vol. 21, No. 1, pp. 157-163, Jan. 2006.   DOI   ScienceOn
22 Z. Yang, S. Ye, and Y. F. Liu, "A new resonant gate drive circuit for synchronous buck converter," IEEE the Premier Global Event In power Electronic, pp. 52-58, Mar. 2006.
23 K. Yao and F. C. Lee, "A novel resonant gate driver for high frequency synchronous buck converters," IEEE Trans. Power Electronics, Vol. 17, No. 2, pp. 180-186, Mar. 2002.   DOI   ScienceOn
24 Y. Zhang, R. Zane, and D. Maksimovic, "Current sharing in digitally controlled masterless multi-phase DC-DC converters," IEEE Int. Conf. Power Electronics, pp. 2722-2728, Jun. 2005.
25 G. loannidis, A. Kandianis, and S.N. Manias, "Novel control design for the buck converter," IEEE Proc-Electr Power Appl., Vol. 145, No. 1, pp. 39-47, Jan. 1998.   DOI   ScienceOn
26 N. Das and M. K. Kazimierczuk, "Power losses and efficiency of buck PWM DC-DC power convertor," IEEE Int. Conf. Electrical Insulation, pp. 417-423, Oct. 2005.
27 M. Ludwig, M. Duffy, T. O'Donnell, P. McCloskey, and S. C. $\acute{O}$   DOI   ScienceOn
28 S. K. Mazumder, A. H. Nayfeh, and D. Borojevic, "Robust control of parallel DC-DC buck converters by combining integral-variablestructure and multiple-sliding-surface control schemes," IEEE Trans. Power Electronic, Vol. 17, No. 3, pp. 428-437, May 2002.   DOI   ScienceOn