Digital control buck converter — Reducing the impact of load change on the output voltage

Power supply circuits used for example to power a high performance electronics systems and modern processors have to keep the supply system stable despite rapid changes of power consumption. For this reason, the choice of the correct transfer function parameters of digital control system in power stage of the converter is particularly important. The study proposes a method of shaping the transfer function of digital control circuit providing effective suppression the output voltage fluctuations when responding to load changes. The method of choosing the transfer function parameters of digital control circuit is shown on the example of the Buck converter controlled by voltage-mode CCM (Continuous Conduction Mode).

[1]  A. Mazurek,et al.  Measurement results of buck converter prototype digitally controlled by algorithm using law of conservation of energy - project Bumblebee , 2008, 2008 15th International Conference on Mixed Design of Integrated Circuits and Systems.

[2]  D. Maksimovic,et al.  Small-signal Discrete-time Modeling of Digitally Controlled DC-DC Converters , 2006, 2006 IEEE Workshops on Computers in Power Electronics.

[3]  W. Janke.  Averaged models of pulse-modulated DC-DC power converters. Part II. Models based on the separation of variables , 2012 .

[4]  Hamid Reza Karimi,et al.  H ∞ Fuzzy Control of DC-DC Converters with Input Constraint , 2012 .

[5]  Shihua Li,et al.  Robust Control for PWM-Based DC–DC Buck Power Converters With Uncertainty Via Sampled-Data Output Feedback , 2015, IEEE Transactions on Power Electronics.

[6]  A. Prodic,et al.  Design of a digital PID regulator based on look-up tables for control of high-frequency DC-DC converters , 2002, 2002 IEEE Workshop on Computers in Power Electronics, 2002. Proceedings..

[7]  D. Maksimovic,et al.  Digitally controlled 10 MHz monolithic buck converter , 2006, 2006 IEEE Workshops on Computers in Power Electronics.

[8]  Jacek Kaczmarek.  Small-signal model of bumbleBee output voltage controller for DC/DC converter , 2009, 2009 MIXDES-16th International Conference Mixed Design of Integrated Circuits & Systems.

[9]  A. Mazurek,et al.  New Concept of DC/DC Converters Digital Control Based on Law of Conservation of Energy - Project "Bumblebee" , 2007, 2007 14th International Conference on Mixed Design of Integrated Circuits and Systems.

[10]  D. Maksimovic,et al.  Hybrid Digital Adaptive Control for Fast Transient Response in Synchronous Buck DC–DC Converters , 2009, IEEE Transactions on Power Electronics.

[11]  D. Maksimović,et al.  Modeling of Quantization Effects in Digitally Controlled DC–DC Converters , 2007 .

[12]  Kosuke Sato,et al.  Transient response improvement of digitally controlled buck-type dc-dc converter with feedforward compensator , 2015, 2015 IEEE International Telecommunications Energy Conference (INTELEC).

[13]  V. Yousefzadeh,et al.  Proximate Time-Optimal Digital Control for DC-DC Converters , 2007, 2007 IEEE Power Electronics Specialists Conference.

[14]  A. Mazurek,et al.  Compensation of Calculations Duration on Converters Output Voltage in Digitally Controled Converters Based on Law of Conservation of Energy - Project "Bumblebee" , 2007, 2007 14th International Conference on Mixed Design of Integrated Circuits and Systems.

[15]  Usman Nasir,et al.  Voltage mode controlled buck converter under input voltage variations , 2015, 2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC).

[16]  Wing-Hung Ki,et al.  An Ultra Fast Fixed Frequency Buck Converter with Maximum Charging Current Control and Adaptive Delay Compensation for DVS Applications , 2007, 2007 IEEE Symposium on VLSI Circuits.

[17]  Mor Mordechai Peretz,et al.  Time-Domain Design of Digital Compensators for PWM DC-DC Converters , 2012 .

[18]  Aleksandar Prodic,et al.  Design and implementation of a digital PWM controller for a high-frequency switching DC-DC power converter , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).

[19]  M. Kazimierczuk.  Pulse-Width Modulated DC-DC Power Converters: Kazimierczuk/Pulse-width Modulated DC-DC Power Converters , 2008 .

[20]  W. Janke,et al.  Equivalent circuits for averaged description of DC-DC switch-mode power converters based on separation of variables approach , 2013 .

[21]  Manfred Morari,et al.  Comparison of Hybrid Control Techniques for Buck and Boost DC-DC Converters , 2010, IEEE Transactions on Control Systems Technology.

[22]  S. Chattopadhyay,et al.  A Digital Current-Mode Control Technique for DC–DC Converters , 2006, IEEE Transactions on Power Electronics.

[23]  W. Janke,et al.  Output characteristics of step-down (Buck) power converter , 2012 .

[24]  Jacek Kaczmarek.  Small-signal Model of BumbleBee Output Voltage Controller for DC/DC Converter Stability Analysis of BumbleBee Method , 2009 .

[25]  Luis Ibarra,et al.  Robust control for buck voltage converter under resistive and inductive varying load , 2016, 2016 13th International Conference on Power Electronics (CIEP).

[26]  Manfred Morari,et al.  On the Optimal Control of Switch-Mode DC-DC Converters , 2004, HSCC.