Arash AHMADI, Shahram KARIMI, Abdolsamad HAMIDI

A low-cost and flexible architecture of digitally controlled DC-DC converter to improve dynamic performance

One type of DC-DC converters is dual transistor forward converter. In this article, a low-cost architecture ofa digital controller for dual transistor forward converter is presented. This architecture is designed by using the finite setmodel predictive control technique. Based on this approach, a low-cost fixed-point arithmetic architecture with minimumfunctional units is presented to find the optimum switching time at each sampling point. Charge balance control methodis utilized to improve the dynamic performance of the transient response. The proposed architecture is implementedand realized by using a field-programmable gate array (FPGA) platform to evaluate the precision of the fixed-pointcalculation. Several cases for different loading conditions for different word lengths are practically investigated and theproposed digital controller shows a minimum voltage overshoot–undershoot and short settling time under load-changingsituations. Compared with other controllers, the presented work provides a better dynamic performance and lowerimplementation cost.

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Li C, Herrera L, Jia J, Fu L, Isurin A, Cook A, Huang Y, Wang J. Design and implementation of a bidirectional isolated Ćuk converter for low-voltage and high-current automotive DC source applications. IEEE T Veh Technol 2014; 63: 2567-2577.
Sha D, You F, Wang X. A high-efficiency current-fed semi-dual-active bridge dc-dc converter for low input voltage applications. IEEE T Ind Electron 2016; 63: 2155-2164.
Soltani M, Mostaan A, Siwakoti YP, Davari P, Blaabjerg F. Family of step-up DC/DC converters with fast dynamic response for low power applications. IET Power Electron 2016; 9: 2665-2673.
Colalongo L, Richelli A, Cabinio P, Kovacs-Vajna ZM. A bidirectional differential cascode voltage switch dc-dc buck-boost converter for low voltage application. Journal of Low Power Electronics 2017; 13: 255-262.
Kanemaru S, Hamada T, Nabeshima T, Sato T, Nakano T. Analysis and optimum design of a buck-type DC-to-DC converter employing load current feedforward. In: 29th Annual IEEE Power Electronics Specialists Conference; 17-22 May 1998; Fukuoka, Japan: IEEE. pp. 309-314.
Song C, Nilles J. L. Accuracy analysis of hysteretic current-mode voltage regulator. In: Twentieth Annual IEEE Applied Power Electronics Conference and Exposition; 6-10 March 2005; Austin, TX, USA: IEEE. pp. 276-280.
Arbetter B, Maksimovic D. DC-DC converter with fast transient response and high efficiency for low-voltage microcontroller loads. In: Applied Power Electronics Conference and Exposition; 15-19 February 1998; New York, USA: IEEE. pp. 156-162.
Dimeas I, Petras I, Psychalinos C. New analog implementation technique for fractional-order controller: A DC motor control. AEU-Int J Electron C 2017; 78: 192-200.
Feng G, Meyer E, Liu YF. A new digital control algorithm to achieve optimal dynamic performance in DC-to-DC converters. IEEE T Power Electr, 2007; 22: 1489-1498.
Hossain MZ, Rahim NA. Recent progress and development on power DC-DC converter topology, control, design and applications: A review. Renew Sust Energ Rev 2018; 81: 205-230.
Milanovic M, Truntic M, Slibar P. FPGA implementation of digital controller for DC-DC buck converter. In: Fifth International Workshop on System-on-Chip for Real-Time Applications; 20-24 July 2005; Banff, Alberta, Canada: IEEE. pp. 439-443.
Fang W, Liu XD, Liu YF. A new digital control algorithm for dual-transistor forward converter. IEEE T Ind Inform 2013; 9: 2074-2081.
Wen Y, Trescases O. DC-DC converter with digital adaptive slope control in auxiliary phase for optimal transient response and improved efficiency. IEEE T Power Electr 2012; 27: 3396-3409.
Cortes P, Quiroz F, Rodriguez J. Predictive control of a grid-connected cascaded H-bridge multilevel converter. In: 14th European Conference on Power Electronics and Applications; 30 August-1 September 2011; Birmingham, United Kingdom. IEEE. pp. 1-7.
Corradini L, Costabeber A, Saggini S. Parameter-independent time-optimal digital control for point-of-load converters. IEEE T Power Electr 2009; 24: 2235-2248.
Rodriguez J, Kazmierkowski MP, Espinoza JR, Zanchetta P, Abu-Rub H, Young HA, Rojas CA. State of the art of finite control set model predictive control in power electronics. IEEE T Ind Inform 2013; 9: 1003-1016.
Vazquez S, Rodriguez J, Rivera M, Franquelo LG, Norambuena M. Model predictive control for power converters and drives: Advances and trends. IEEE T Ind Electron 2017; 64: 935-947.
Linder A, Kanchan R, Kennel R, Stolze P. Model-Based Predictive Control of Electric Drives. Gottingen, Germany: Cuvillier, 2010.
Riar BS, Scoltock J, Madawala UK. Model predictive direct slope control for power converters. IEEE T Power Electr 2017; 32: 2278-2289.