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An adaptive fuzzy sliding-mode (AFSM) control system is developed to control parallel DC-DC boost converters. The AFSM control system that combines a fuzzy adaptation technique with sliding mode control to enhance robustness and sliding performance in a class of uncertain multi-input multi-output (MIMO) nonlinear systems is proposed. Using an online adaptation scheme, a fuzzy sliding mode controller...
In this paper we design a controller that solves the tracking problem for the boost and buck-boost converters. A stable nonlinear system is obtained that produces the necessary inputs in order to exactly track the inductor current reference. This property is used to track a given reference signal for the capacitor voltage. We also present an study of the bounds that must be satisfied by the current...
Non-linear control is a popular way to regulate the output voltage of switch-mode DC-DC converters. In this paper, a controller based on the non-linear sliding mode theory, but adapted to maintain a constant switching frequency, is proposed. A general definition of the sliding surface is suggested, making it possible to use the same control architecture for different DC-DC converter topologies (e...
In view of nonlinearity and unstable zero-dynamics existing in Boost type DC/DC converter when using capacitor voltage as output, there is a great limitation on its performance, such as low-bandwidth and sluggish dynamic response. This paper, based on input-output feedback linearization, proposes a novel scheme of nonlinear control strategy. This strategy can not only solve the nonlinearity and unstable...
Multiphase interleaved buck converters are widely used for point of load applications, especially for VRMs. Performance optimization issue often clashes with size and cost requirements thus leading the industrial and academic research to focus on advanced solutions. This paper presents a control technique for multiphase VRMs including two interacting sections: the linear loop implements a PWM peak...
To satisfy today's power demands of a VLSI chip, the digital power IC has been designed in order to have more programmability, faster transient response and higher efficiency. Thank to the advance of the semiconductor manufacturing process. It has enabled the ability to integrate the power MOSFET, the analog and the digital circuits into one chip. In this paper, a 12V, 2A digital synchronous DC-DC...
The dc-dc multilevel boost converter topology was recently proposed with features such as high voltage gain without using an extreme duty ratio, few components and self dc-link balancing. This paper presents the state space modeling and a linear controller based on the pole placement technique for the dc-dc multilevel boost converter. Nonlinear and linear models are derived. Simulation results obtained...
This paper compares the computational time and closed loop system performances for linear and nonlinear Model Predictive Control (MPC) of the full bridge DC/DC converter under starting, overload and load step change conditions. The control objective is to regulate the output voltage without violating the peak current constraint. The experimental results reveal that both linear and nonlinear MPC algorithms...
In this paper the nonlinear average current control for a DC-DC buck converter is presented in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The outer voltage control loop uses a PI controller. In the present control scheme, switch current is being sensed instead of inductor current. Sensing of the switch current instead of inductor current is particularly attractive...
In this paper the nonlinear average current control for a DC to DC buck converter is presented in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The outer voltage controller uses a PI controller. In this control scheme, switch current is being sensed instead of inductor current. Average of inductor current, output voltage with line and load regulation is being controlled...
This paper presents the digital current mode control employing nonlinear resistive current mode control and digital state feedback control using the pole placement technique for parallel interleaved DC-DC converters. The former method achieves current sharing by converting the effective input characteristic of the converters seen by the source to a resistive load sink. The latter method derives the...
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