Linear-non-linear control (LnLc) for DC-DC buck converters: stability and transient response analysis

Barrado, A.; Lázaro, A.; Pleite, J.; Vázquez, R.; Vázquez, Juan Luís; Olías, E.

doi:10.1109/apec.2004.1295995

Cited by 37 publications

(24 citation statements)

References 3 publications

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“…Fig. 20 compares the efficiencies of the proposed converter and the conventional linear converter from [3] as a function of the load current for V in = 32V and V out = 16V . As is apparent from the figure, compared to the conventional circuit, the efficiency of the proposed circuit is higher under a wide range of load currents, especially for light loads.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, systems that use batteries or have limited energy sources (e.g., solar cell powered systems) require voltage converters with high efficiency and high quality at a low cost [2]. Buck converters, as one of the widely used converters, have been investigated with different structures and control methods (see, e.g., [3]- [16]). In these converters, the voltage conversion is based on applying a voltage pulse (with a specific duty cycle and frequency) to a low pass filter.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve the desired output voltage value and quality, a control unit is used. Many different controllers have been suggested for these circuits (see, e.g., [3]- [9]). The control circuit can [5].…”

Section: Introductionmentioning

confidence: 99%

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A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter

Rokhsat-Yazdi¹,

Afzali-Kusha²,

Pedram³

2010

Journal of Power Electronics

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In this paper, a simple yet efficient auto mode-hop ripple control structure for buck converters with light load operation enhancement is proposed. The converter, which operates under a wide range of input and output voltages, makes use of a statedependent hysteretic comparator. Depending on the output current, the converter automatically changes the operating mode. This improves the efficiency and reduces the output voltage ripple for a wide range of output currents for given input and output voltages. The sensitivity of the output voltage to the circuit elements is less than 14%, which is seven times lower than that for conventional converters. To assess the efficiency of the proposed converter, it is designed and implemented with commercially available components. The converter provides an output voltage in the range of 0.9V to 31V for load currents of up to 3A when the input voltage is in the range of 5V to 32V. Analytical design expressions which model the operation of the converter are also presented. This circuit can be implemented easily in a single chip with an external inductor and capacitor for both fixed and variable output voltage applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter

Rokhsat-Yazdi¹,

Afzali-Kusha²,

Pedram³

2010

Journal of Power Electronics

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show abstract

“…Moreover, the knowledge of parameter variation range is required in order to ensure stability. A simple way to improve transient response is to introduce saturation logic on the duty ratio, reduce the inductor value, and increase the capacitance of the output capacitor [6]. However, the capacitor could be too big, and the capacitance value may be impractical.…”

Section: Introductionmentioning

confidence: 99%

Non-linear Cascade Control of DC/DC Buck Converter

Tsang

Chan

2008

Electric Power Components and Systems

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A model-based cascade controller design is presented for the control of DC/DC Buck converters. Detailed discussions in the setting of bandwidth for the current loop and voltage loop have been given. Robustness analysis of the cascade controller against load changes and supply changes are also presented. Finally, a deadband relay is introduced in the voltage loop to improve the disturbance rejection and speed of response of the Buck converter. Circuit implementation of the proposed control scheme is presented, and experimental results are included to demonstrate the effectiveness of the proposed design scheme. Comparisons with conventional single-loop proportional-plus-integral control and cascade control are also made.

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“…In order to keep the load voltage at the desired level, the buck converter has to be operated in a closed loop mode with a suitable feedback controller. Various types of control techniques include current-mode control, voltage-mode control, hysteresis control, charge control [1], PI/PID control, sliding-mode control [2], linear/non-linear control [3,4], or a combination of PI control and state space control [5] etc. These controllers are implemented using either digital or analog designs.…”

Section: Introductionmentioning

confidence: 99%

Optimal feedback controller design for a buck converter using Gaussian type pheromone profile

Sundareswaran

Devi

Kaul

et al. 2010

Int Trans Elec Energy Syst

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SUMMARYThis paper reports the development of a novel optimization algorithm based on a colony of natural ants. The pheromone deposition of a group of foraging ants is perceived as a Gaussian profile and the ants are made to move by sampling the profile. The effectiveness of the algorithm is first verified on a set of benchmark functions and then extended to the design of a feedback controller for a buck converter. The proposed algorithm is illustrated through computed and measured results. Further, the new method is compared with Genetic Algorithm (GA) and is found to be on par with it.

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Linear-non-linear control (LnLc) for DC-DC buck converters: stability and transient response analysis

Cited by 37 publications

References 3 publications

A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter

A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter

Non-linear Cascade Control of DC/DC Buck Converter

Optimal feedback controller design for a buck converter using Gaussian type pheromone profile

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