Discrete‐time sliding‐mode‐based digital pulse width modulation control of a boost converter. Issue 5 (1st May 2015)

• Record Type: Journal Article
• Authors: Vidal‐Idiarte, Enric; Marcos‐Pastor, Adria; Garcia, Germain; Cid‐Pastor, Angel; Martinez‐Salamero, Luis
• Is Part Of: IET power electronics. Volume 8:Issue 5(2015)
• Page Start: 708
• Page End: 714
• Publication Date: 2015-05-01
• Subjects: discrete time systems -- direct digital control -- PWM power convertors -- nonlinear control systems -- cascade control -- electric current control -- variable structure systems -- PI control -- voltage control -- linearisation techniques; discrete‐time sliding mode motion approximation -- boost converter -- nonlinear digital current‐control -- digital pulse width modulation control -- cascade regulation scheme -- inner loop -- discrete‐time proportional‐integral controller -- output voltage regulation -- analytical expression -- simplified discrete‐time small‐signal parametric model -- discrete‐time PI compensator -- desired equilibrium point -- PWM controlled system -- direct digital design technique -- continuous conduction mode -- linearisation; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2014.0380
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : In this study, a non‐linear digital control of a boost converter based on a sliding discrete‐time approximation is presented. The control strategy follows a classical cascade regulation scheme with the inner loop consisting in a non‐linear current‐control based on discrete‐time sliding mode, and the outer one being composed of a simple discrete‐time proportional‐integral (PI) controller for output voltage regulation. An analytical expression of the current control law is developed using a simplified discrete‐time small‐signal model of the boost converter. The discrete‐time PI compensator is designed from a discrete‐time small‐signal parametric model of the inner loop obtained by linearisation around the desired equilibrium point. The proposed method is initially based on the notion of discrete‐time sliding motion to eventually derive a pulse width modulation (PWM) controlled system. Thus, the reported approach can be categorised not only as a direct digital design technique for voltage regulation but also as a competitive method to design sliding‐mode‐based PWM controllers. Simulated and experimental results in a boost converter operating in continuous conduction mode verify the theoretical predictions.