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Efficiency Enhancement of a Dual Active Bridge Converter with a Variable Inductor for Battery Charging Applications 16

Efficiency Enhancement of a Dual Active Bridge Converter wit...

引用

16th Seminar on Power Electronics and Control, SEPOC 2024

作者： Marques, Conrado Gomes Cipriani, Joao Pedro Scherer Dickow, Maicon Wellington Roggia, Leandro Tibola, Jonas Roberto Seidel, Alysson Raniere Electrical Engineering Post-Graduation Program RS Santa Maria Brazil UFSM RS Santa Maria Brazil

ISBN: (纸本)9798350379419

This paper presents the integration of a variable inductor into a dual-active-bridge (DAB) converter for battery charging applications, emphasizing efficiency improvements. The variable inductor introduces an additional degree of freedom to conventional single-phase-shift modulation. By adjusting the inductance, the converter achieves optimal soft switching and minimizes current circulation, surpassing the performance of the traditional phase-shift method with a fixed inductor, specially under extreme output power conditions. To validate this approach, a 600 W prototype converter was developed to charge a lead-acid battery-bank. The efficiency of the DAB with the variable inductor was measured and compared to that of the DAB with fixed inductor across the full range of the battery voltage and power. Experimental results demonstrate that the DAB converter with variable inductor achieves superior performance for battery charging compared to the traditional DAB with fixed inductor under both low and high-load conditions. © 2024 IEEE.

关键词： Lead acid batteries

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Evaluation of a Wireless Power Transfer System with Helmholtz and 3D coils for Biomedical Capsules 6

Evaluation of a Wireless Power Transfer System with Helmholt...

引用

6th International Symposium on Instrumentation Systems, Circuits and Transducers, INSCIT 2022

作者： Magnaguagno, Jeferson Bertotti, Fabio Luiz Universidade Tecnológica Federal Do Paraná-UTFPR Electrical Engineering Post-Graduation Program-PPGEE Pato Branco Brazil

ISBN: (数字)9781665471688

ISBN: (纸本)9781665471688

Wireless Power Transfer (WPT) systems are commonly found in battery charging solutions for electronic devices such as smartphones and tablets. In medicine, they are applied in biotelemetry systems with implantable units and in capsules to monitor parameters of the gastrointestinal tract. Several studies explored WPT systems with inductive links formed by two or more coils. However, few studies have considered inductive links with Helmholtz coils for application in capsules. This paper presents the development of a prototype of a WPT system suitable for monitoring capsules formed by live coils, three of which are a set of 3D receiver coils. The development of a class E amplifier allowed the power delivery to the link. In the experiments performed, the maximum energy (power) received in the load was 662.2 mW for the closest distance between transmitter and receiver coils, while the efficiency reached 3.31 %. Furthermore, the maximum achieved distance that maintained the regulated 3.3 Vcc power supply at load was 240 mm, even with changes in the orientation of the set of 3D receiver coils. © 2022 IEEE.

关键词： Power amplifiers

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MOS Capacitor Modeling and Optimization for Fully Integrated DC-DC Converters 7

MOS Capacitor Modeling and Optimization for Fully Integrated...

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7th International Symposium on Instrumentation Systems, Circuits and Transducers, INSCIT 2023

作者： Bernardo, Marcos G. Freire, Raimundo C. S. De Souza, Antonio A. L. Souza, Arthur S. Silva, Henrique D. Federal University of Campina Grande Ufcg Post-Graduation Program in Electrical Engineering PPgEE/UFCG Campina Grande Brazil Federal University of Paraiba Ufpb João Pessoa Brazil

ISBN: (纸本)9798350326512

In this paper, we propose a model for the rapid characterization of MOS-type capacitors in the accumulation region. Closed-form analytical expressions have been used to estimate the equivalent circuit elements, which are calculated as a function of the design parameters of the layout and of the technological process. To verify the modeling carried out, a set of MOS capacitors with different geometries were simulated in ADS® and the main characteristics of the capacitor were compared. Based on the model, an analysis/optimization was implemented in MATLAB® in order to determine the capacitor/cell layout parameters that optimize its structure, based on a figure of merit. Compared to another work in the literature, the proposed method showed a chip-area reduction of 20.82% and an ESR of 16.38% smaller for the same capacitance value. Capacitor optimization not only contributes to reducing costs but also to improving the performance of the circuit it will make part of. © 2023 IEEE.

关键词： DC-DC converters

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Passive and Flexible UHF RFID Tag for Body-Worn Applications

Passive and Flexible UHF RFID Tag for Body-Worn Applications

引用

SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Jéssyca Iasmyn Lucena Araujo Juliete Da Silva Souza Danilo Freire De Souza Santos Alexandre Jean René Serres Post-Graduation Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil

There is a great interest in epidermal devices that provide comfort to users. In this work, an RFID tag for on-body applications on a polyimide substrate was proposed. The tag consists of a low-profile flexible substrate that conforms to the body's curvature, allowing comfortable monitoring of physiological functions. The passive tag has a total dimension of $112.6\times 26.6\ \text{mm}^{2}$ . It is composed of a folded dipole antenna, in which two Complementary Split Ring Resonator (CSRR) cells were incorporated to improve its performance in proximity to the body, and the Monza® X-2K Dura chip from Impinj®. According to the simulation results, its maximum read range is 3.21 m. Two experiments were carried out: one without the presence of the human body and another with the tag on the abdomen of a volunteer. The maximum read range achieved in the first configuration was 1.89 m, and in the second configuration, it was 1.10 m.

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Analyses of Photovoltaic Systems Performance with Fuzzy Inference Systems and Bayesian Networks

Analyses of Photovoltaic Systems Performance with Fuzzy Infe...

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Power Electronics and Control (SEPOC), Seminar on

作者： Nicole Polityto Cremasco Myriam Regattieri De Biase da Silva Delgado Jair Urbanetz Junior Luiz Ledo Mota Melo Jorge Assade Leludak Keiko Verônica Ono Fonseca Program of Post-Graduation of Electrical Engineering and Industrial Informatics(CPGEI) of Federal University of Technology of Paraná(UTFPR) Program of Post-Graduation of Electrical Engineering and Industrial Informatics(CPGEI) of the Federal University of Technology of Paraná(UTFPR) Program of Post-Graduation in Energy Systems of Federal University of Technology of Paraná(UTFPR Department of Electrical Engineering (DAELT)) Federal University of Technology of Paraná(UTFPR) Curitiba Brazil

Renewable energy sources have been increasingly targeted as an alternative for reducing fossil fuel emissions. This scenario requires a better understanding of energy systems' performance and limitations, notably using photovoltaic setups under diverse meteorological conditions and determining device measurement uncertainties. Accordingly, this study conducts a performance evaluation of a photovoltaic system of copper, indium, and gallium (di)selenide technology. It compares the results provided by a reference normalized equation with two interpretable artificial intelligence techniques, Fuzzy Inference System and Bayesian Networks, when temperature is also considered. In the experiments, the study found significant percentage differences between the normalization procedure and the fuzzy system on days with lower irradiation values. On the other hand, the results provided by Bayesian networks presented lower difference percentages in relation to the normalization equation values.

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Triple RSIW Fed Antipodal Vivaldi Antenna for Bandwidth Improvement 15

Triple RSIW Fed Antipodal Vivaldi Antenna for Bandwidth Impr...

引用

15th European Conference on Antennas and Propagation, EuCAP 2021

作者： De Albuquerque, Camila C. R. Gomes Neto, Alfredo De Oliveira, Alexandre M. Serres, Georgina K. De F. Jean Rene Serres, Alexandre Federal University of Campina Grande Post-Graduation Program in Electrical Engineering Campina Grande Brazil

ISBN: (纸本)9788831299022

In this paper, it is presented a new modified structure of antipodal Vivaldi antenna (AVA). The structure is fed by a triple ridged substrate integrated waveguide (RSIW) on a single layer low-cost FR4 substrate. The ridges insertion allows a bandwidth enhancement due to the cut-off frequency decrease and consequently the miniaturization. The new structure is compared to an AVA fed by a classical SIW designed for a cut-off frequency around 4 GHz. Numerical simulations were performed and a bandwidth enhancement of 660 MHz was achieved with a gain of 2.06-7.59dBi within the frequency range. © 2021 EurAAP.

关键词： Substrate integrated waveguides

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Compact dual-band system for near-field wireless power transfer using defected ground structures for practical ISM bands 5

Compact dual-band system for near-field wireless power trans...

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5th International Symposium on Instrumentation Systems, Circuits and Transducers, INSCIT 2021

作者： Ferreira, Filipe Bulla, Giovani Muller, Ivan Post Graduation Program UFRGS Department of Electrical Engineering Porto Alegre Brazil UFRGS Department of Electrical Engineering Porto Alegre Brazil

ISBN: (纸本)9781728197265

Near-field wireless power transfer systems (NF-WPT) have been attracting attention for their potential applications such as biomedical implants, RFID and portable electronic devices. In this context, compact models are proposed for NF-WPT systems in industrial, scientific and medical (ISM) bands employing the concept of defected ground structure (DGS) resonators. The proposed WPT operates in a 433 MHz and 900 MHz dual-band targeting applications that require energy and data transfer. The proposed WPT system is designed using Ansys Electronics electromagnetic (EM) analysis software and built with the Rogers 4003 substrate. DGS resonators have a total area of 11.7 × 10.2 mm2 and an optimal WPT distance of 15 mm between transmitter and receiver. At this distance, a figure of merit (FoM) were measured and presented 0.71 and 1.07 at 440 MHz and 918 MHz, respectively. © 2021 IEEE.

关键词： Defected ground structures

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CVO: Curriculum Vitae Optimization by Recommending Keywords to Undergraduate students 11th

CVO: Curriculum Vitae Optimization by Recommending Keywords...

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11th and 12th EAI International Conference on Big Data Technologies and Applications, BDTA 2021 and BDTA 2022

作者： Santos, Cibele Góes, Fabrício Martins, Carlos da Cunha, Felipe Post-Graduation Program in Electrical Engineering Pontifícia Universidade Católica de Minas Gerais MG Belo Horizonte30535-901 Brazil Informatics Department University of Leicester Leicester United Kingdom Post-Graduation Program in Informatics Pontifícia Universidade Católica de Minas Gerais MG Belo Horizonte30535-901 Brazil Department of Computer Science Pontifícia Universidade Católica de Minas Gerais MG Belo Horizonte30535-901 Brazil

ISBN: (纸本)9783031336133

Candidate selection platforms have been widely used in companies that seek agility in the process of hiring. Candidates who do not meet the requirements of a job vacancy are disqualified in the first step, called screening. This stage has been automated due to the large volume of curriculum vitae (CV) of candidates per vacancy, particularly for internship vacancies. As a consequence, candidates receive little to none feedback and do not know how to improve/optimize their CVs for new applications. The goal of this paper is to realize the curriculum vitae optimization (CVO) process for internship vacancies by implementing a recommendation system that given an undergraduate student CV, it suggests the addition of relevant keywords, taking into account the student’s undergraduate course. This system is implemented based on the clustering of CVs keywords, from an internship recruitment private company database, into profile groups which are linked to internship vacancies. The experimental results showed that recommendations improved students CVs similarity (competitiveness within a specific field) from 18.83%, with 3 keywords recommendation, up to 50.67%, with 10 words. © 2023, ICST Institute for Computer Sciences, Social Informatics and Telecommunications engineering.

关键词： students

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Efficiency Enhancement of a Dual Active Bridge Converter with a Variable Inductor for Battery Charging Applications

Efficiency Enhancement of a Dual Active Bridge Converter wit...

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Power Electronics and Control (SEPOC), Seminar on

作者： Conrado Gomes Marques João Pedro Scherer Cipriani Maicon Wellington Dickow Leandro Roggia Jonas Roberto Tibola Álysson Raniere Seidel Electrical Engineering Post-Graduation Program Federal University of Santa Maria (UFSM) Santa Maria RS Industrial Technical School of Santa Maria (CTISM - UFSM) Santa Maria RS

ISBN: (数字)9798350379419

ISBN: (纸本)9798350379426

关键词： Seminars Inductance Voltage measurement Soft switching Switching loss Prototypes Switched reluctance motors Batteries Inductors Voltage control

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Towards System Security: What a Comparison of National Vulnerability Databases Reveals

Towards System Security: What a Comparison of National Vulne...

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Iberian Conference on Information Systems and Technologies (CISTI)

作者： Igor Forain Robson de Oliveira Albuquerque Rafael Timó teo de Sousa Jú nior Electrical Engineering Department Professional Post-Graduation Program in Electrical Engineering - PPEE Faculty of Technology University of Bras&#x00ED lia (UnB) Bras&#x00ED lia Brazil

System vulnerabilities are ubiquitous nowadays. In 2021, millions of cyberattacks exploited system flaws resulting in billions of losses. Despite massive vulnerability databases supported by the USA and China governments, there are still several unknown issues between them. This paper proposes a methodology to compare the National Vulnerability Database (NVD), the China National Vulnerability Database (CNVD), and the China National Vulnerability Database of Information Security (CNNVD). The results reveal that the CNNVD has 1,661 vulnerabilities entries more than the NVD and at least 40 more entries regarding Chinese vendors. Moreover, there is a temporal correlation of 0.917560 between the NVD and CNNVD. To the best of the authors’ knowledge, this work is the first to normalize and compare the NVD, CNVD, and CNNVD using their data feeds.

关键词： Measurement Correlation Databases XML Legislation Information security Software

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