Al-Qadisiyah Journal for Engineering Sciences

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

Document Type : Research Paper

Authors

Abdullah Sahib Abdulsada 1
Nasir Hussein Selman 2

1 Department of Electronic and Communication Technologies, AL-Furat AL-Awsat Technical University, Najaf, Iraq

2 Engineering Technical College/Najaf, AL-Furat AL-Awsat Technical University, Najaf, Iraq

10.30772/qjes.2024.145861.1076
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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Al-Qadisiyah Journal for Engineering Sciences
Volume 17, Issue 2
Spring 2024
Pages 158-164

  • Receive Date 28 January 2024
  • Revise Date 06 April 2024
  • Accept Date 24 June 2024

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