Core volume reduction based on non-linear inductors for a PV DC–DC converter

Martins, Sebastián; Seidel, A. R.; Perdigão, M. S.; Roggia, Leandro

doi:10.1016/j.epsr.2022.108716

Cited by 3 publications

(5 citation statements)

References 21 publications

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“…perturbations. However, the relationship between controlled current and inductance is nonlinear [20]. A reference estimator relates the controlled current 𝑖 and 𝐿 to solve the nonlinear relationship.…”

Section: Variable Inductor Operationmentioning

confidence: 99%

“…The current-source converter regulates the inductance using a robust controller since the VI suffers from uncertainties and external perturbations. However, the relationship between controlled current and inductance is nonlinear [20]. A reference estimator relates the controlled current i c and L 2 to solve the nonlinear relationship.…”

Section: Variable Inductor Operationmentioning

confidence: 99%

“…The VI is a magnetic device that allows for variation in the inductance based on the current source; therefore, an auxiliary winding is needed [19]. In [20], a detailed design methodology and the possibility of reducing core volume in a power converter were presented. The main advantage of the VI is that only one magnetic component is used to simultaneously achieve power transfer and current ripple manipulation.…”

Section: Introductionmentioning

confidence: 99%

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A High-Voltage-Gain DC–DC Boost Converter with Zero-Ripple Input Current for Renewable Applications

et al. 2023

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Renewable energy sources in DC microgrids require high-performance conversion systems to increase their capacity and reliability. Among other characteristics in conversion systems, the current ripple is a characteristic that must be considered since it affects the performance of PV panels and batteries. In this paper, a high-voltage-gain DC–DC boost converter for performing current ripple elimination that is based on a variable inductor is proposed. The topology is composed of a diode–capacitor voltage multiplier and a modified cascaded boost converter. To achieve voltage regulation, a reduced-order switched model is obtained considering the switched capacitor’s dynamics. To address the inductance variation and external disturbances, the H∞ control theory is adapted to systematically design a robust proportional–integral (PI) controller. Details of the working principles and the sizing of passive components are presented. The simulation and experimental results demonstrate that the input current ripple of the proposed converter can be removed in both transitory and steady states.

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Section: Variable Inductor Operationmentioning

confidence: 99%

Section: Variable Inductor Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A High-Voltage-Gain DC–DC Boost Converter with Zero-Ripple Input Current for Renewable Applications

et al. 2023

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“…Using a power inductor beyond the linear zone is of interest in modern power electronics because its exploitation improves the power density of switch-mode power supplies (SMPS); it allows a higher operating current without increasing the core size [1][2][3][4][5]. However, the different shape of the current, compared to a linear inductor, implies an increase in the current peak that rises the losses and, consequently, the operating temperature of the magnetic core [6].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Current for a Non-Linear Power Inductor Including Temperature in DC-DC Converters

2023

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A method for estimating the current flowing through a non-linear power inductor operating in a DC/DC converter is proposed. The knowledge of such current, that cannot be calculated in closed form as for the linear inductor, is crucial for the design of the converter. The proposed method is based on a third-order polynomial model of the inductor, already developed by the authors; it is exploited to solve the differential equation of the inductor and to implement a flux model in a circuit simulator. The method allows the estimation of the current up to saturation, intended as the point at which the differential inductance is reduced to half of its maximum value. The current profile depends also on the inductor temperature. Based on this, the influence of core temperature on the conduction time of the power switch was determined. This study shows that the exploitation of saturation requires a proper value of the conduction time value that depends on the temperature. The theoretical analysis has been experimentally verified on a boost converter and is valid for the entire class of DC-DC converters in which the power inductor is subjected to a constant voltage for a given time. The simulations agree with the experimental data from a case study concerning conduction time and temperature.

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“…In order to avoid inductor saturation, the standard design rules of inductors for DC-DC converters lead to oversized cores, which do not allow the proper exploitation of magnetic material. However, design configuration operating in partial saturation allows for further reduction in the core dimension, accepting a limited increase in the total losses [9][10][11][12][13][14]. Figure 1 represents a set of design configurations (each dot in the plane represents the results of one configuration) obtained considering only the operation in linear conditions (yellow dots), compared to the ones that are achievable, including the operation in partial saturation (blue dots).…”

Section: Introductionmentioning

confidence: 99%

Data-Driven Constraint Handling in Multi-Objective Inductor Design

et al. 2023

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This paper analyses the multi-objective design of an inductor for a DC-DC buck converter. The core volume and total losses are the two competing objectives, which should be minimised while satisfying the design constraints on the required differential inductance profile and the maximum overheating. The multi-objective optimisation problem is solved by means of a population-based metaheuristic algorithm based on Artificial Immune Systems (AIS). Despite its effectiveness in finding the Pareto front, the algorithm requires the evaluation of many candidate solutions before converging. In the case of the inductor design problem, the evaluation of a configuration is time-consuming. In fact, a non-linear iterative technique (fixed point) is needed to obtain the differential inductance profile of the configuration, as it may operate in conditions of partial saturation. However, many configurations evaluated during an optimisation do not comply with the design constraint, resulting in expensive and unnecessary calculations. Therefore, this paper proposes the adoption of a data-driven surrogate model in a pre-selection phase of the optimisation. The adopted model should classify newly generated configurations as compliant or not with the design constraint. Configurations classified as unfeasible are disregarded, thus avoiding the computational burden of their complete evaluation. Interesting results have been obtained, both in terms of avoided configuration evaluations and the quality of the Pareto front found by the optimisation procedure.

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Core volume reduction based on non-linear inductors for a PV DC–DC converter

Cited by 3 publications

References 21 publications

A High-Voltage-Gain DC–DC Boost Converter with Zero-Ripple Input Current for Renewable Applications

A High-Voltage-Gain DC–DC Boost Converter with Zero-Ripple Input Current for Renewable Applications

Assessment of the Current for a Non-Linear Power Inductor Including Temperature in DC-DC Converters

Data-Driven Constraint Handling in Multi-Objective Inductor Design

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