Robust digital voltage mode control of buck converter with enhanced tracking performance

Abdulsada, Abdullah Sahib; Selman, Nasir Hussein

doi:10.30772/qjes.2024.145861.1076

	Robust digital voltage mode control of buck converter with enhanced tracking performance
Al-Qadisiyah Journal for Engineering Sciences
Article 9, Volume 17, Issue 2, June 2024, Pages 158-164 PDF (752 K)
Document Type: Research Paper
DOI: 10.30772/qjes.2024.145861.1076
Authors
Abdullah Sahib Abdulsada¹; Nasir Hussein Selman^* ²
¹Department of Electronic and Communication Technologies, AL-Furat AL-Awsat Technical University, Najaf, Iraq
²Engineering Technical College/Najaf, AL-Furat AL-Awsat Technical University, Najaf, Iraq
Abstract
The digital voltage controller of power converters is used because it has many advantages over its analog counterparts. Thus, in this paper, a controller of digital voltage mode is designed and analyzed for a non-isolated DC-DC buck converter in continuous conduction mode (CCM). First, an analog controller is designed using a Bode plot to achieve the desired stability margins in the frequency domain. Next, the analog controller is discretized using bilinear transformation with the pre-warping method. The characteristics of the discretized compensator can be maintained close to the corresponding analog compensator as long as a proper sampling time is selected. The digital control scheme is simulated with a nonlinear DC-DC buck converter model in MATLAB/Simulink to investigate the controller performance. The simulation results demonstrated the validation of the proposed digital voltage-mode control design approach. The developed digital controller eliminates DC error by tracking the reference voltage, achieving a fast transient response, maintaining specified stability margins, and effectively rejecting large disturbances.
Keywords
DC-DC converter; Buck converter; Digital integral-lead controller; Current-mode control; Voltage-mode control

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