NDLI: Direct digital design of a sliding mode-based control of a PWM synchronous buck converter

Content Provider	IET Digital Library
Author	Idiarte, Enric Vidal Pastor, Adria Marcos Giral, Roberto Calvente, Javier Salamero, Luis Martinez
Abstract	A discrete-time sliding mode approach allowing direct digital design of a pulse width modulation (PWM) control of a synchronous buck converter is presented in this study. Without the need of a compensating ramp, a non-linear difference equation representing the output voltage dynamic behaviour is employed to demonstrate the global stability of the internal control loop of the inductor current. Discrete-time small-signal model is derived from the linearisation of the ideal sliding-mode equations, which facilitates the design of the output voltage controller. This model exhibits a zero whose value depends on the operating point coordinates and explains the duty cycle delay associated to digitally PWM controlled converters. The validity of the transfer function is demonstrated through simulation by comparing its frequency behaviour with that obtained from the more accurate switched model of the converter. Experimental results for start-up, load and line perturbations, current and voltage reference variations in a 25 W prototype switching at 100 kHz are in good agreement with the theoretical predictions.
Starting Page	1714
Ending Page	1720
Page Count	7
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 13, Oct (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0975
Journal	IET Power Electronics
Publisher Date	2017-06-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control System Analysis Control System Synthesis Current Control Differential Equation (numerical Analysis) Digital Control Digitally PWM Controlled Converter Direct Digital Design Discrete Control System Discrete Time System Discrete-time Small-signal Model Duty Cycle Delay Electric Current Control Frequency 100 KHz Frequency Behaviour Global Stability Inductor Current Internal Control Loop Line Perturbations Linearisation Technique Load Perturbations Multivariable Control System Nonlinear And Functional Equation Nonlinear Difference Equation Nonlinear Differential Equation Numerical Analysis Output Voltage Controller Design Output Voltage Dynamic Behaviour Power 25 W Power Electronics Power Supply Pulse Width Modulation Control PWM Power Converter PWM Synchronous Buck Converter Sliding Mode-based Control Sliding-mode Equation Linearisation Stability Stability in Control Theory Supervisory Circuit Switching Converter Synthesis Method Transfer Function Variable Structure System Voltage Control Voltage Reference Variations
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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