Title: Design, implementation and performance evaluation of different digital control techniques for current controlled DC-DC Buck converter

Authors: Dipen M. Vachhani; Rajesh Arya; Uma Rathore Bhatt

Addresses: Laser Electronics Division, Raja Ramanna Centre for Advanced Technology, Indore – 452013, India ' Laser Electronics Division, Raja Ramanna Centre for Advanced Technology, Indore – 452013, India ' Department of Electronics and Telecommunication, Institute of Engineering and Technology, Devi Ahilya University, Khandawa Road, Indore – 452017, India

Abstract: The paper presents modelling, control architecture, analysis and design of digital compensators for single feedback-loop voltage mode control as well as two feedback-loop average current mode control and peak current mode control of current controlled DC-DC Buck converter operating in continuous conduction mode with output current as control variable. The compensators are derived using digital redesign approach, simulated on MATLAB, implemented as control algorithms on Texas Instruments' 32-bit TMS320F28069M microcontroller platform, and experimentally validated by testing with a laboratory prototype of current controlled Buck converter. Simulation and experimental results are discussed, compared and evaluated for converter output current performance in tracking reference current signal as well as in regulation against input voltage and load disturbances. Salient features of each control technique are identified and described to determine its suitability in applications of DC-DC converters requiring controlled output current.

Keywords: digital control techniques; digital voltage mode control; digital average current mode control; digital peak current mode control; current controlled DC-DC Buck converter; continuous conduction mode; digital redesign; digital compensators; type-2 compensator; 2p2z compensator.

DOI: 10.1504/IJPELEC.2023.127549

International Journal of Power Electronics, 2023 Vol.17 No.1, pp.97 - 128

Received: 13 Aug 2020
Accepted: 13 Jun 2021
Published online: 08 Dec 2022 *