Abstract
The buck converter is frequently introduced in the industry to maintain the stability of the voltage output when having the interference suddenly. In order to promote the robustness of the buck converter, a novel hybrid <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H<sub>2</sub></i> model following control (HHMFC) is developed based on digital redesign sliding mode control in this article. First, we design <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H<sub>2</sub></i> model following SMC in the continue-time domain. Then, by using the digital redesign approach, the continuous SMC is redesigned to a corresponding discrete-time SMC and the proposed HHMFC is achieved. Finally, we apply the developed HHMFC to realize a robust buck converter. With both the simulation and experiment results, we can conclude that the proposed HHMFC can easily and successfully apply to the practical realization for the buck converter with better robustness performance.
Highlights
Switch-mode direct current-direct current (DC-DC) converters transfer the DC voltage level to another, which may be higher or lower, by storing the input energy temporarily and releasing that energy to the output at a different voltage
In the literature, many works with different design approaches explored the stability of the buck converter, such as sliding mode control (SMC) [3,4,5], fuzzy control [6,7], adaptive control [8], adaptive-predictive control [9], back stepping control [10], etc
We aim to propose a novel hybrid H2 model following control (HHMFC) based on digital redesign sliding mode control to implement the buck converter
Summary
Switch-mode direct current-direct current (DC-DC) converters transfer the DC voltage level to another, which may be higher or lower, by storing the input energy temporarily and releasing that energy to the output at a different voltage. We aim to propose a novel hybrid H2 model following control (HHMFC) based on digital redesign sliding mode control to implement the buck converter. To utilize the digital signal processing (DSP) microcontroller to implement the control schemes, the traditional continuous-time SMC design methods proposed in [13,14,15] are not applicable. To solve this problem, the digital-redesign method is proposed to directly transform the well-designed continuous analog controller to the discrete type. This proposed design procedure can obtain a discrete-time HHMFC and guarantee the robust performance even if the system is with perturbations. W is used to denote the Euclidean norm of the vector w
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