Circuit theory 1 Chapter 5 Problem solving 2- 회로이론1 5장 문제풀이 2-Professor Kim, Myung-Sik- Kumoh National Institute of Technology-SOUTH KOREA

Electronic Engineering -Circuit theory 1 Professor Kim, Myung-Sik- Kumoh National Institute of Technology-SOUTH KOREA

Hightech Marketing-Konkuk University-INSTRUCTOR Yeonghwan Lee

Hightech Marketing-Konkuk University-INSTRUCTOR Yeonghwan Lee Social Science ManagementㆍEconomy International Management; Commerce

 In the midst of the rapid changes of technologies and the market, how a business can attain and increase its competitiveness. This includes discussions on efficient management techniques and some related anecdotes of successes. In the latter part of the semester, social media marketing strategies using some social network services such as Facebook and Twitter will be discessed. If time permits, cult braning and marketing 3.0 will be covered (In the midst of the rapid changes of technologies and the market, how a business can attain and increase its competitiveness. This includes discussions on efficient management techniques and some related anecdotes of successes. In the latter part of the semester, social media marketing strategies using some social network services such as Facebook and Twitter will be discessed. If time permits, cult braning and marketing 3.0 will be covered)

Laplace Equation- MIT OpenCourseWare-Instructor: Gilbert Strang

AUTOMATIC CONTROL-CHAPTER 8 -ROOT LOCUS TECHNIQUE 01-INSTRUCTOR-Kwan-Woong Gwak- Sejong University Mechanical and Aerospace Engineering

AUTOMATIC CONTROL-CHAPTER 8 -ROOT LOCUS TECHNIQUE 01-INSTRUCTOR-Kwan-Woong Gwak- Sejong University  Mechanical and Aerospace Engineering

Course Title
Automatic Control  -Instructor  Kwan-Woong Gwak

This course introduces the basic principles of feedback control of dynamic system, related system analysis technics, and the design of the controller satisfying the given dynamic specifications.
To achieve the course goals, system modeling technics describing the dynamic systems into mathematical differential equations, technics (root locus, Nyquist) analyzing the dynamic characteristics (stability, tranqusient response) in both time and frequency domain will be
studied.
Also, PID and lead-lag controller design method that makes the system dynamic characteristics satisfy the required specifications will beinvestigated.

Main text: Franklin, Powell, Emami-Naeini, "Feedback Control of Dynamic Systems",
7th ed., Pearson Education
reference: Normal S. Nise, "Control Systems Engineering", 5th ed., Wiley
Ogata, "Modern Control Engineering", 4th ed., Prentice Hall

Franklin, Powell, Emami-Naeini, "Feedback Control of Dynamic Systems", 6th ed.,
Pearson Education

LINK FULL COURSE AUTOMATIC CONTROL
http://www.kocw.net/home/search/kemView.do?kemId=1321135

Engineering Mathematics 2 Hanyang University FOURIER SERIES

Digital signal processing -ADVANCED TOPICS ON DSP-Kyungpook National University-OPEN COURSEWARE-INSTRUCTOR HA YEONG-HO- SOUTH KOREA

Lyapunov Function Based Control for Single-Switch Isolated Converters by Seok-Min Wi Department of Electrical Engineering Pohang University of Science and Technology

Lyapunov Function Based Control for Single-Switch Isolated Converters by Seok-Min Wi Department of Electrical Engineering Pohang University of Science and Technology 

A dissertation submitted to the faculty of the Pohang University of Science and Technology in partial fullment of the requirements for the degree of Doctor of Philosophy in the Department of Electrical Engineering Pohang, Korea

 Abstract
 In this dissertation, we propose a Lyapunov function based control scheme for a single-switch isolated converter. A single-switch isolated converter can be designed to operate either in the discontinuous conduction mode (DCM) or in the continuous conduction mode (CCM). Naturally, a single-switch isolated converter operating in di erent modes results in di erent dynamics. When it operates in CCM, it su ers from nonminimum phase behavior due to the occurrence of right-half-plane zeros in its transfer function. When it operates in DCM, it experiences low system gain. Thus, it is di - cult to stabilize the isolated converter operating only in CCM, and both in DCM and CCM. With regard to control design of the single-switch isolated converter, the small signal model around a xed operating point has been popular due to its simplicity. However, linearized model cannot re ect the complete dynamic behavior of the single-switch isolated converter particularly under large perturbations from the operating point. For this reason, it shows poor transient response under large-signal perturbation. Therefore, a nonlinear controller should be developed that does not require any linearization process in case of large-signal perturbation. The Lyapunov function based control strategy, which usually o ers a solution that guarantees global asymptotic stability under large perturbations from the operating point. In constructing the controller, we rst derive the large-signal nonlinear dynamic model of the single-switch isolated converter using averaged state-space modeling technique considering the parasitic components. After that, we develop the duty-ratio feedforward control part and use it to derive the error dynamics. The resulting error dy namic model is then used to develop the Lyapunov function based feedback controller. The proposed control scheme consists of two components: the duty-ratio feedforward control term that helps the output voltage to track the reference voltage, and the Lyapunov function based feedback control term that drives the closed-loop system to become globally exponentially stable. The control system guarantees global exponential stability of the closed-loop system and provides fast transient response under largesignal perturbations. Numerical simulations con rmed its superior performance, and experimental tests validated the proposed control approach.

LINK
http://postech.dcollection.net/public_resource/pdf/200000007651_20190622041129.pdf

Digital signal processing -THE Z TRANSFORM-Kyungpook National University-OPEN COURSEWARE-INSTRUCTOR HA YEONG-HO- SOUTH KOREA

Digital signal processing Kyungpook National University-OPEN COURSEWARE-INSTRUCTOR HA YEONG-HO Engineering> Electrical & Electronics> Electrical Engineering.
The objective of this course is to make students understand and cultivate the principles and applications of digital signal processing in graduate level, and expand the concepts to the advanced topics

Novel Gel Electrolyte for Efficient Rechargeable Battery UNIVERSITY OF WATERLOO

Rechargeable lithium-ion batteries have recently become infamous for causing explosions, and are known to have issues relating to efficiency. With lithium ion-based batteries so prevalent in today’s technology, the need for a safer, more efficient battery is clear.  Rechargeable lithium-ion batteries have recently become infamous for causing explosions, and are known to have issues relating to efficiency. With lithium ion-based batteries so prevalent in today’s technology, the need for a safer, more efficient battery is clear. This Nanotechnology Engineering team has designed a novel aqueous gel electrolyte that includes silica nanoparticles and polyvinyl alcohol (PVA) to reduce corrosion and induce thixotropy, the property of a solution becoming liquid-like when shaken or stirred and solid-like when left alone. This new design will improve upon the safety and efficiency of the lithium-ion battery.
 Capstone Design Team Members: Sunghee (Sydney) Bang, In Sik (Brian) Cho, Jessica Ly, and Hansol (Skylar) Yoo
 Follow us on social media! Twitter: twitter.com/waterlooeng
Facebook: facebook.com/uWaterlooEngineering Instagram: instagram.com/uwaterlooeng/
LinkedIn: linkedin.com/groups/56527/
Ten Thousand Coffees: tenthousandcoffees.com/hub/waterlooengineering

Centre for Intelligent Antenna and Radio Systems UNIVERSITY WATERLOO

Centre for Intelligent Antenna and Radio Systems, a world-class research facility, supports transformative national and international industry collaborative activities in radio science and technology. CIARS offers unique prototyping, simulation, and measurement capabilities for integrated antenna and radio system technologies in the MHz to THz bands. CIARS current research targets 5G communication systems, Internet of Things (IoT) networks, next generation mobile satellite communications, advanced sensor devices and novel measurement techniques. Exploring unconventional approaches to meet future challenges in wireless communication, sensing, and imaging.

Join the conversation:
Twitter: twitter.com/waterlooeng
Facebook: facebook.com/uWaterlooEngineering
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Waterloo Engineering Hub: tenthousandcoffees.com/hub/waterlooengineering

Cold Increases Service Life The Influence of the Operating Temperature on the Service Life and Reliability of Switching Power Supplies By Dipl.-Ing. (FH) Stefan Bergstein, Product Manager of EMTRON electronic GmbH-Bodo´s Power Systems

Cold Increases Service Life The Influence of the Operating Temperature on the Service Life and Reliability of Switching Power Supplies By Dipl.-Ing. (FH) Stefan Bergstein, Product Manager of EMTRON electronic GmbH-Bodo´s Power Systems

 The question of whether to use a transformer power supply or a switch-mode power supply is no longer dicussed today. In addition to superior technical properties, switched-mode power supplies impress with low costs, low weight and little space requirement. Certain requirements such as PFC (Power Factor Correction > 0.9 and sinusoidal mains current) can only be met with switched-mode power supplies. The question remains, what are the greatest influences on the service life and reliability of a switched-mode power supply?

LINK ORIGINAL:https://www.bodospower.com/
LINK PDF :
http://www.mediafire.com/file/iyexi5fa0e44yfk/COLD_INCRESEAS_SERVICE_LIFE_POWER_SUPPLY.pdf/file

Leading-Edge Power Modules for the New Era in Traction Converters By Vishal Jadhav, Wilhelm Rusche and Andre Lenze; Infineon Bodo´s Power Systems

Leading-Edge Power Modules for the New Era in Traction Converters Today, 55 percent of the world’s population live in urban areas, a proportion that is expected to increase to 68 percent by 2050 [1]. With this ever-increasing urban population, in combination with an increasing number of commuters on public transport, and a growing awareness of energy-efficiency and emission-free transportation systems, traction application is back in the limelight. A megatrend like urbanization provides a tailwind to improve, enhance and innovate today’s traction converters and components within its ecosystem. Power semiconductors, which are core components of traction converters enhancing their reliability, efficiency and longevity, are of utmost importance. By Vishal Jadhav, Wilhelm Rusche and Andre Lenze; Infineon.

BODO POWER SYSTEM MAY 2019
LINK: https://www.bodospower.com

Custom Transformers – Leakage Inductance Considerations By Dr. Ray Ridley, Ridley Engineering Inc. May 2019 Bodo´s Power Systems

Custom Transformers – Leakage
Inductance Considerations
By Dr. Ray Ridley, Ridley Engineering Inc.
May 2019 Bodo´s Power Systems
LINK: https://www.bodospower.com

Conception de convertisseurs électroniques de puissance à faible impact électromagnétique intégrant de nouvelles technologies d’interrupteurs à semi-conducteurs Présentée par Eliana RONDON-PINILLA Ecole Doctorale d’Electronique, Electrotechnique, Automatique-Université de Lyon

Conception de convertisseurs électroniques de puissance à faible impact électromagnétique intégrant de nouvelles technologies d’interrupteurs à semi-conducteurs Présentée par Eliana RONDON-PINILLA Ecole Doctorale d’Electronique, Electrotechnique, Automatique-Université de Lyon

 Résumé 
Actuellement, le développement de semiconducteurs et la demande croissante de convertisseurs en électronique de puissance dans les différents domaines de l’énergie électrique, notamment pour des applications dans l’aéronautique et les réseaux de transport et de distribution, imposent de nouvelles spécifications comme le fonctionnement à hautes fréquences de commutation, densités de puissance élevées, hautes températures et hauts rendements. Tout ceci contribue au fort développement des composants en SiC (Carbure de Silicium). Cependant, ces composants créent de nouvelles contraintes en Compatibilité Electromagnétique (CEM) à cause des conditions de haute fréquence de commutation et fortes vitesses de commutation (forts di/dt et dv/dt) en comparaison à d’autres composants conventionnels de l'électronique de puissance. Une étude des perturbations générées par les composants SiC est donc nécessaire. L'objectif de ce travail est de donner aux ingénieurs amenés à concevoir des convertisseurs une méthode capable de prédire les niveaux d'émissions conduites générées par un convertisseur électronique de puissance qui intègre des composants en SiC. La nouveauté du travail présenté dans cette thèse est l’intégration de différents modèles de type circuit pour tous les constituants d’un convertisseur (un hacheur série est pris comme exemple). Le modèle est valable pour une gamme de fréquences de 40Hz à 30MHz. Des approches de modélisation des parties passives du convertisseur sont présentées. Ces approches sont différentes selon que les composants modélisés soient disponibles ou à concevoir : elles sont basées sur des mesures pour la charge et les capacités ; elles sont basées sur des simulations prédictives pour routage du convertisseur. Le modèle complet du convertisseur (éléments passifs et actifs) est utilisé en simulation pour prédire les émissions conduites reçues dans le réseau stabilisateur d’impédance de ligne. Le modèle est capable de prédire l'impact de différents paramètres comme le routage, les paramètres de contrôle comme les différents rapports cycliques et les résistances de grille avec des résultats satisfaisants dans les domaines temporels et fréquentiels. Les résultats obtenus montrent que le modèle peut prédire les perturbations en mode conduit pour les différents cas jusqu'à une fréquence de 15MHz. Finalement, une étude paramétrique du convertisseur a été élaborée. Cette étude a permis de voir l’influence de la qualité des différents modèles comme les éléments parasites du routage, des composants passifs et actifs et d'identifier les éléments qui ont besoin d’un modèle précis pour avoir des résultats valides dans la prédiction des perturbations conduites.
LINK
https://www.theses.fr/2014ECDL0018.pdf

Conception d’un module d’électronique de puissance “Fail-to-short” pour application haute tension- Ilyas Dchar -THESE de DOCTORAT DE L’UNIVERSITE DE LYON

Conception d’un module d’électronique de puissance “Fail-to-short” pour application haute tension- Ilyas Dchar-  THESE de DOCTORAT DE L’UNIVERSITE DE LYON Designing a Power Module with Failure to Short Circuit Mode Capability for High Voltage Applications 

Abstract
The reliability and endurance of high power converters are paramount for future HVDC networks. Generally, module’s failure behavior can be classified as open-circuit failure and short-circuit failure. A module which fails to an open circuit is considered as fatal for applications requiring series connection. Especially, in some HVDC application, modules must be designed such that when a failure occurs, the failed module still able to carry the load current by the formation of a stable short circuit. Such operation is referred to as short circuit failure mode operation. Currently, all commercially available power modules which offer a short circuit failure mode use silicon semiconductors. The benefits of SiC semiconductors prompts today the manufacturers and researchers to carry out investigations to develop power modules with Fail-to-short-circuit capability based on SiC dies. This represents a real challenge to replace silicon power module for high voltage applications in the future. The work presented in this thesis aims to design a SiC power module with failure to short circuit failure mode capability. The first challenge of the research work is to define the energy leading to the failure of the SiC dies in order to define the activation range of the Fail-to-short mechanism. Then, we demonstrate the need of replacing the conventional interconnections (wire bonds) by massive contacts. Finally, an implementation is presented through a "half bridge" module with two MOSFETs.

Keywords : Press-Pack, Sandwich structure, conventional module, HVDC converter, Packaging, Failure, Short-circuit, Avalanche, Critical energy, Explosion, Stability, SiC.

LINK:
https://tel.archives-ouvertes.fr/tel-01784733/file/these.pdf

PROJETO E IMPLEMENTAÇÃO DE PLANTA FOTOVOLTAICA DE 65 KWP-PEDRO HENRIQUE ALBUQUERQUE GUIMARÃES-UNIVERSIDADE FEDERAL DO CEARÁ CENTRO DE TECNOLOGIA DEPARTAMENTO DE ENGENHARIA ELÉTRICA GRADUAÇÃO EM ENGENHARIA ELÉTRICA-BRASIL

PROJETO E IMPLEMENTAÇÃO DE PLANTA FOTOVOLTAICA DE 65 KWP-PEDRO HENRIQUE ALBUQUERQUE GUIMARÃES
UNIVERSIDADE FEDERAL DO CEARÁ CENTRO DE TECNOLOGIA DEPARTAMENTO DE ENGENHARIA ELÉTRICA GRADUAÇÃO EM ENGENHARIA ELÉTRICA
 Monografia apresentada ao Curso de Engenharia Elétrica do Departamento Elétrica da Universidade Federal do Ceará, como requisito parcial para a obtenção do título de Engenheiro Eletricista. Orientador: Prof. Dr. Paulo César Marques de Carvalho 

 RESUMO O presente trabalho visa apresentar as atividades realizadas durante as etapas de projeto e implementação de uma planta fotovoltaica de 65 kWp, localizada em região litorânea do nordeste brasileiro. Na fase de projeto, são explicitados os cálculos realizados para o dimensionamento do sistema e os critérios utilizados para a escolha de seus componentes. Optou-se, então, por painéis da Canadian Solar de 325 Wp e um inversor da ABB com potência nominal de 50 kW. Foi feito um levantamento topográfico com veículo aéreo não tripulado para estudo de sombreamento do local. Esse estudo foi elaborado com o auxílio do software de simulação PV*Sol, o que resultou na obtenção de parâmetros como fator de capacidade (FC) e previsão de geração. Os resultados foram de 19,92% de FC e previu-se uma produção de 113.429,5 kWh/ano. Na fase de implementação, são descritos todos os procedimentos realizados para a instalação do sistema. Estes foram divididos em etapas, a fim de ilustrar em ordem cronológica o trabalho desempenhado. Por fim, é feita a análise geral dos custos aproximados e prazos relacionados com a realização do projeto, além de enaltecer pontos positivos e pontuar melhorias nas atividades. Os custos finais excederam em 14,96% do valor de R$ 285.000,00 estimado previamente. Esse aumento se deu por dificuldades logísticas e gastos com obras de infraestrutura de segurança. A implantação foi concluída com sucesso após 4 meses e 20 dias do início do projeto.
LINK MONOGRAFIA COMPLETA:
http://www.repositorio.ufc.br/bitstream/riufc/35086/1/2018_tcc_phaguimaraes.pdf

CONCEPÇÃO E ANÁLISE DE UM SISTEMA DE ENERGIA PARA PICOSATÉLITES-DISSERTAÇÃO DE MESTRADO Everson Mattos-UNIVERSIDADE FEDERAL DE SANTA MARIA PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA-SANTA MARIA-RS-BRASIL

RESUMO Dissertação de Mestrado Programa de Pós-Graduação em Engenharia Elétrica Universidade Federal de Santa Maria 
CONCEPÇÃO E ANÁLISE DE UM SISTEMA DE ENERGIA PARA PICOSATÉLITES
 AUTOR: EVERSON MATTOS
 ORIENTADOR: MÁRIO LÚCIO DA SILVA MARTINS
 CO-ORIENTADOR: RAFAEL CONCATTO BELTRAME
 Data e Local de Defesa: Santa Maria, RS, 27 de Abril de 2016

Em 1999 o padrão CubeSat foi criado para facilitar e reduzir os custos para lançamento de picosatélites, na sua maioria de cunho didático. Dadas às restrições de volume, peso e custo, os sistemas de energia devem primar pela eficiência e simplicidade. Os sistemas elétricos de potência para CubeSat podem ser divididos em dois tipos: os sistemas concentrados e os sistemas distribuídos. Há inúmeras vantagens na utilização dos sistemas distribuídos em relação aos sistemas concentrados, como por exemplo: melhor distribuição térmica, menor geração de ruídos, dentre outras. Os objetivos de um sistema elétrico de potência para CubeSat são: Manter, tanto nos períodos de sol quanto de eclipse, os subsistemas com alimentação necessária ao seu correto funcionamento; Manter as baterias carregadas para os períodos de eclipse; suprir todos os picos de demanda de energia do CubeSat. Para alcançar esses objetivos e respeitar as restrições físicas impostas pelo padrão CubeSat, os sistemas devem operar com um reduzido número de estágios de conversão de energia, principalmente se esses estiverem operando em cascata; deve empregar um estágio com algoritmo para rastrear o ponto de máxima potência do gerador fotovoltaico e regular a tensão do barramento CC de alimentação das cargas do CubeSat. Este trabalho propõe a utilização de um sistema de energia para CubeSat que utiliza dois conversores com topologia empilhada. Um conversor boost que realiza a regulação do barramento CC distribuído para as cargas do CubeSat, e um conversor buck-boost que possui duas funções: rastrear o ponto de máxima potência (MPPT) do arranjo fotovoltaico e controlar a corrente de carga das baterias. A combinação do controle de carga das baterias e a busca do ponto de máxima potência no mesmo conversor, resulta na redução do tempo de carga das baterias. A conexão dos conversores formando a topologia empilhada proporciona a redução da razão cíclica no conversor boost, e consequentemente, a redução das perdas em condução devido a redução da corrente. Além disso, a composição em série da bateria com a tensão do conversor boost proporciona um aumento da tensão do barramento CC distribuído para as cargas do CubeSat, o que reduz as correntes de carga e novamente as perdas em condução de ambos os conversores. Os resultados experimentais comprovam o funcionamento da topologia proposta e a eficiência do EPS compatível com a eficiência dos sistemas comerciais com arquitetura concentrada.
 Paravras-chave: CubeSat, Sistema Elétrico de Potência, Conversores CC-CC

LINK ORIGINAL
http://mtc-m21b.sid.inpe.br/col/sid.inpe.br/mtc-m21b/2016/07.13.19.33/doc/Dissertacao_Everson_Mattos.pdf

Advances in PV Inverters- Anthon, Alexander-Thesis Doctor of Philosophy in Electrical Engineering at the Technical University of Denmark

Advances in PV Inverters- Anthon, Alexander This report is part of the requirements to achieve the Doctor of Philosophy in Electrical Engineering at the Technical University of Denmark.

 Abstract 
Renewable energies have experienced a significant growth and importance in the last two decades, of which energy from photovoltaic plants are a major contributor. Since solar cells have low efficiencies themselves, however, the necessity of high efficiency power converters at low cost and preferably low complexity leads to new research demands. This is especially true in the field of low cost residential PV inverters where efficiencies are used as major selling arguments. Traditional converter topologies equipped with conventional Silicon based semiconductors to date reach their limitations and new approaches are necessary. Therefore, research areas typically focus on both new topologies and utilizing more advanced semiconductor devices. To this end, semiconductor devices made of Silicon Carbide have been gaining increasing interest in the last two decades after the successful commercialization of high voltage power diodes. By now, the performance potential of switching devices made of Silicon Carbide is commonly accepted, though they have not found commonplace usage within commercial converter systems for several reasons, among others reliability, availability/cost and gate driver complexity. Therefore, more complex Silicon based converters can be used instead to achieve lower semiconductor losses. While there is no absolute solution in which direction to go to achieve the aforementioned design goals, this dissertation will thoroughly investigate two potential approaches and discuss their trade-offs. The contributions are: • Comprehensive loss analysis and identification of major loss contributors within T-Type converter topology operating in inverter and rectifier context. • Evaluation of the use and loss benefits of Silicon Carbide switching devices in the T-Type structure. • Thorough investigation of the Hybrid-Neutral-Point-Clamped (Hybrid-NPC) topology as an alternative for the Silicon Carbide based T-Type converter. • Alternative methodology of semiconductor loss model validation by experimental means. As to the advanced three-level T-Type converter topology, its unusual operation mode is thoroughly described identifying its limitations for high efficiency operation. With these results, the first approach utilizes low loss switching devices and their influence on the semiconductor loss behavior is analyzed. The results show that, for near unity power factor operation, a replacement of only two switching devices per phase leg can greatly reduce the semiconductor losses. The Hybrid-NPC converter can be seen as an attractive and cost competitive alternative to the Silicon Carbide based converter, also allowing to overcome the major drawbacks with the conventional Silicon IGBT based T-Type structure. Both alternatives are based on a semiconductor/topological level and thus this is where the loss reduction occurs. The difficulty in experimentally evaluating only the semiconductor losses within a converter operating context is addressed in this work by presenting an alternative measurement approach. Using known heat loads, and a careful calibration procedure on the device heat sink, analytically obtained semiconductor loss models based on datasheet information and in-circuit switching transitions measurements can be experimentally verified and thus a fair performance comparison between two approaches is enabled.

LINK ORIGINAL
http://orbit.dtu.dk/files/119990172/Advances_in_PV_Inverters.pdf

WEBINAR Inversores Solares e suas Topologias-Data do webinar - 04 Junho 2019, às 19h00

EVENTO GRATUITO 
ENTENDA TUDO SOBRE INVERSORES SOLARES E CONHEÇA AS MELHORES TECNOLOGIAS DISPONÍVEIS NO MERCADO 

Data do webinar - 04 Junho 2019, às 19h00

 INSCREVA-SE AGORA

VISITA A INFORDATA INGENIERIA DE LA INFORMATICA LIMA PERU -29 MAIO 2019

ENG. JUAN VICENTE HUAPAYA (GERENTE GENERAL INFORDATA) E ENG.ARMANDO CAVERO MIRANDA COM AS CANECAS DA COPA AMERICA BRASIL 2019

EQUIPE TECNICO DA INFORDATA JUNTO COM ENG. JUAN VICENTE HUAPAYA

FOI MUITO GRATO VISITAR A UNA DAS MAIORES EMPRESAS DE ENGENHARIA DE INFORMATICA DE LIMA PERU,INFORDATA,TENHO A ALEGRIA DE TER ESTUDADO ENGENHARIA ELETRÔNICA NA UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS COM O GERENTE GENERAL ENG. JUAN VICENTE HUAPAYA,TEMOS UMA AMIZADE QUE TRANSCENDE O TEMPO,A INFORDATA NASCE EM 1988 ATUALMENTE TEM COMO PRODUTO PRINCIPAL SERVIDORES PARA O SETOR EMPRESARIAL,SETOR CORPORATIVO,USUARIO HOME OFFICE,DESENVOLVIMENTO DE SOFTWARE PARA TELEFONES CELULARES,VENDA DE DRONES,LAPTOPS,UPS,Lousa Digital/Tela Interativa | Alto padrão de qualidade .
 A INFORDATA ACREDITA NA PESQUISA E DESENVOLVIMENTO DE NOVOS SOFTWARES QUE SEJAM APLICADOS EM TELEFONES CELULARES.

Confira os 10 principais benefícios da Lousa Interativa:

1. Torna o aprendizado mais agradável, seguro e participativo.

 2. Facilita a prática pedagógica dos professores, que podem projetar e manipular conteúdos de diversas formas.

 3. É um recurso multimídia versátil que se adapta às necessidades das turmas, de acordo com o seu perfil e nível de aprendizagem.

 4. Amplia a motivação e o interesse dos alunos.

 5. Aumenta a familiarização dos professores com o uso de novas tecnologias.

 6. Possibilita o ensino em tempo real, pois é um recurso que pode ser usado a qualquer momento.

 7. Permite que o professor faça anotações escritas ou que opere softwares, apresente e edite imagens, mostre vídeos, navegue na Internet, entre outas atividades.

 8. Facilita a aprendizagem colaborativa ao estimular o aprendizado e o trabalho em grupo. Isto é, aumenta o diálogo e a cooperação entre professores e alunos.

 9. Possibilita a interação com diversos tipos de conteúdo e autonomia para criação de projetos.

 10. Potencializa a aprendizagem, trazendo recursos diferenciados para aproximar os alunos dos conhecimentos a serem adquiridos em sala de aula.

MAIORES INFORMAÇÕES :https://www.infordata.com.pe/

Start-up Circuit and Power Sequence Design for Initial Start-up of Hysteretic Controlled Step-down Converter- Chai-won Kim-Department of Electronics & Electrical Engineering Graduate School Dankook University-2018

Initial Start-up of Hysteretic Controlled Step-down Converter Chai-won Kim Department of Electronics & Electrical Engineering Graduate School Dankook University

ABSTRACT

 With the rapid spread of battery-based portable products that emphasize convenience like Smart-phones today, the importance and demand for power management circuits are rapidly increasing. Therefore, miniaturization, long operation time, and stability are important for electronic devices, so the power management circuit needs to research and develop low power, miniaturization and light weight in accordance with market demand. Since the power management circuit plays a role of the other system, stable operation is important. In this paper, we design a dual soft-start circuit and a power-up sequence for stable start-up because the entire system starts to run faster as the power management circuit becomes faster. Digital Soft-start has low power consumption and can easily change the reference voltage. In addition, in the case of the digital soft-start circuit, there is an advantage that an external capacitor element is not necessary and the area can be reduced. In the case of the analog type soft-start circuit, the soft-start time can be adjusted by adjusting the external capacitor value according to the user, and the output voltage is linear. Therefore, in this paper, dual soft-start circuit is designed to support both the advantages of digital and analog soft-start. In the case of the power-up sequence design, after the supply voltage of the buck converter is supplied, the required voltage between the internal circuits of the Bias Block is monitored for a stable bias voltage. If the voltage required by one circuit is secured, the next bias circuit starts to operate Respectively. As a result, the power-up sequence is designed in order of Bandgap Reference-> Enable-> LDO-> UVLO-> Mode-> Soft-start so that stable operation can be performed during start-up of the buck converter. As a further study, we proposed a soft-start circuit design method to reduce the start-up time of Buck converter. This design was designed using Samsung BCD 0.13um process, and Psim provided by Korea Power Systems Co. and Cadence provided by Cadence Co. were used. We used the Virtuoso layout editor for layout design and Mentor's caliber for DRC and LVS verification.

LINK
https://www.mediafire.com/file/xuwxxukj7fbcgv5/Hysteretic_Controlled_Step-down_Converter.pdf/file