Barıs YILDIZ, Gokhan ALTINTAS, Mehmet Onur GULBAHCE, Derya Ahmet KOCABAS

Design, Voltage Mode Control and Non-ideal Analysis of a Low Voltage-High Current Synchronous Buck Converter

Synchronous and non-synchronous buck converters are uninsulated DC-DC converters which are widely used in any application that needs low voltage and high current. Switches are accepted as ideal during simulations of these converters in order to simplify the analysis. Non-ideal case can be analyzed by adding the resistances of switches and inductances as components to simulation. In this study, steady state and transient state are both analyzed for non-ideal case for continuous conduction mode by designing a 225 W synchronous buck converter. Simulations are performed in MATLAB/Simulink by calculated design parameters. A digital controller was designed according to simulation results in order to control the output voltage. Stability analysis for the designed converter was achieved. In the second part of the study, converter was manufactured and designed controller was embedded to a DSP based microcontroller. The performance of the system was investigated by testing the designed circuit under variable load and input voltage conditions and a comparison between simulation results for non-ideal case and practical results was made.

Keywords:

switch-mode power supply, converter, synchronous buck transient state, steady state, stability, C2000 Piccolo LaunchPad,

PDF

___

[1]A. Peterchev, S. Sanders, "Digital Loss Minimizing Multi-Mode Synchronous Buck Converter Control". 2004 35th Annual IEEE Power Electronics Specialists Conference, Aachen, Germany, 20-25 June 2004.
[2] M. Karadeniz, O.M. Gulbahce, D.A. Kocabas. "A practical design and analysis of a high power DC to DC converter". MECHATRONIKA, 2012 15th International Symposium, Prague, Czech Republic, 5-7 December 2012.
[3] G. Suman, B. Kumar, M. Kumar, B. Babu, K. Subhashini. "Modeling, Analysis and Design of Synchronous Buck Converter Using State Space Averaging Technique for PV Energy System". International Symposium on Electronic System Design (ISED), Kolkata, India, 19-22 December 2012.
[4] P.J. Agrawal, "Modeling and simulation of low duty ratio buck synchronous converter under large load current switching". 2013 IEEE 63rd Electronic Components and Technology Conference, Las Vegas, USA, 28-31 May 2013.
[5] B.C. Babu, Sriharsha, A. Kumar, N. Saroagi, R.S Samantaray, "Design and Implementation of Low Power Smart PV Energy System for Portable Applications Using Synchronous Buck Converter". 2011 International Symposium on Electronic System Design (ISED), Kochi, India, 19-21 December 2011.
[6] V.A. Stankovic, L. Nerone, P. Kulkarni. "Modified Synchronous-Buck Converter for a Dimmable HID Electronic Ballast". IEEE Transactions on Industrial Electronics, 59(4), 1815-1824, 2012.
[7] R. Erickson, D. Maksimovic. “Fundamentals of Power Electronics”, 2nd ed. New York, Kluwer Academic Publishers, USA, 2001.
[8] C.G. Wilson, J.Y. Hung, R.N. Dean. "A sliding mode controller for two-phase synchronous buck converters". IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, Montreal, QC, 25-28 October 2012.
[9] Y. Yuan, Y. Lv, G. Tong. "Study on the digitally controlled system of ZCS-QRC synchronous buck converter". Control Conference (CCC), Yantai, China, 22-24 July 2011.
[10] C. Chang. "Mixed voltage /current mode control of PWM synchronous buck converter". Power Electronics and Motion Control Conference, Xi'an, China, 14-16 August 2004.
[11] B. Jongbok, C. Wooin, B. Cho. "Digital control of synchronous buck converter with multi-mode for wide load range". Power Electronics and Motion Control Conference (IPEMC), Harbin, China, 2-5 June 2012.
[12] D. Hart, “Power Electronics”. 1st ed. New York, McGraw-Hill, USA, 2011.
[13] J. Kassakian. “Principles of Power Electronics”. 1st ed. Utah,, Addison-Wesley, USA, 1991.
[14] Infineon. “HV Floating MOS-Gate Driver ICs”. http://www.infineon.com/dgdl/an-978.pdf?fileId=5546d462533600a40153559f7cf21200z (11.10.2016).
[15] G. Altintas, M.O. Gulbahce, D.A. Kocabas “Nonideal Analysis, Design and Voltage Mode Control of a Boost Converter”. RTUCON 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University, Riga, Latvia, 13-14 October 2016.