AUTOR DO BLOG ENG.ARMANDO CAVERO MIRANDA SÃO PAULO BRASIL
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“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”
“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”
https://picasion.com/
sábado, 29 de março de 2025
terça-feira, 25 de março de 2025
sexta-feira, 14 de março de 2025
quarta-feira, 5 de março de 2025
terça-feira, 4 de março de 2025
NATIONAL TAIWAN UNIVERSITY 電磁理論 02 Maxwell and His Equations II Fundamental Concepts I
As equações de Maxwell, também conhecidas como equações de Maxwell-Heaviside, são um conjunto de equações diferenciais parciais que descrevem como os campos elétrico e magnético se interagem e se propagam. Elas unificaram as teorias da luz e do eletromagnetismo, marcando um dos grandes avanços na física. Junto com a lei da força de Lorentz, as equações formam a base da teoria eletromagnética.
domingo, 2 de março de 2025
LLC CONVERTER PROTOTYPE
segunda-feira, 24 de fevereiro de 2025
sábado, 22 de fevereiro de 2025
Optimal Design and Implementation of High-voltage High-power Silicon Steel Core Medium Frequency Transformer Pei Huang, Chengxiong Mao, Senior Member, IEEE, Dan Wang, Member, IEEE, Libing Wang, Yuping Duan, Jun Qiu, Guang Xu, and Huihong Cai
Abstract—A 1.5 kV, 35 kW, 1 kHz silicon steel core
medium frequency transformer is designed and prototyped
for a 10 kV, 0.5 MW electronic power transformer. This
transformer uses 0.18 mm silicon steel as core material
due to the advantages of easy processing, high saturation
flux density, low noise, and low cost. The detailed design
considerations and an optimal design method are
presented in this paper. Different from the previous work
on medium frequency transformer design, the proposed
approach takes ripples into account. Core loss model
under square wave excitation with ripple and winding loss
model considering sideband harmonics are established.
Besides, 2D finite element simulations are adopted to
obtain ac/dc resistance factors. Finally, the proposed
approach is verified by experiments on prototype. The test
results show performance better than expected, with
efficiency over 99% and power density of 2.9623×106 W/m3.
VIEW FULL TEXT: https://ieeexplore.ieee.org/document/7862899
segunda-feira, 17 de fevereiro de 2025
Processo de fabricação de transformador trifásico (Dongguan Wenbian Electric)
Processo de fabricação de transformador trifásico (Dongguan Wenbian Electric)
Processo de produção de transformador toroidal [Dongguan Wenbian Electric]
Processo de produção de transformador toroidal [Dongguan Wenbian Electric]
Enrolamento do transformador monofásico (transformador monofásico Dongguan Wenbian Electric
Enrolamento do transformador monofásico (transformador monofásico Dongguan Wenbian Electric
Transformador de controle monofásico BK-3.5-Dongguan Wenbian Electric
Transformador de controle monofásico BK-3.5-Dongguan Wenbian Electric
quinta-feira, 13 de fevereiro de 2025
SOLUTION OF ELECTRICAL CIRCUITS IN ELECTRICAL ENGINEERING USING DEEPSEEK
SOLUTION OF ELECTRICAL CIRCUITS IN ELECTRICAL ENGINEERING USING DEEPSEEK
quinta-feira, 6 de fevereiro de 2025
Using DeepSeek software to solve circuit parameters POWER ELECTRONICS-SÃO PAULO-BRASIL
FILE PDF PROBLEMS AND SOLUTIONS
1-DEEPSEEK CIRCUIT : https://www.mediafire.com/file/7yf8hmg5d1njryx/DEPSEEK-CIRCUITO+.pdf/file
3-PROBLEM SOLUTION 4: https://www.mediafire.com/file/sy7aovj8q80v03n/mit6_622_s23_ps04_-+PROBLEMSOLUTION.pdf/file
ORIGINAL LINK 1: https://ocw.mit.edu/courses/6-622-power-electronics-spring-2023/resources/mit6_622_s23_ps04_pdf/
quarta-feira, 29 de janeiro de 2025
Overview on Battery Charging Systems for Electric Vehicles Pierpaolo Dini * , Sergio Saponara and Antonio Colicelli
Overview on Battery Charging Systems for Electric Vehicles Pierpaolo Dini * , Sergio Saponara and Antonio Colicelli Department of Information Engineering, University of Pisa, Via Girolamo Caruso n.16, 56100 Pisa, Italy
Abstract: Catalyzed by the increasing interest in bi-directional electric vehicles, this paper delves
into their significance and the challenges they encounter. Bi-directional electric vehicles not only
serve as transportation but also function as essential electricity resources. Central to this energy
revolution are On-Board Chargers (OBCs), which are pivotal in converting alternating (AC) energy
into direct (DC) energy and vice versa. In this context, we explore the various circuit architectures of
OBCs employed in bi-directional electric vehicles. We delve into the intricacies of rectifiers, switching
converters, and the application of advanced control and filtering technologies. Our analysis extends
to the implications of these circuit architectures on aspects such as voltage regulation capability,
energy efficiency, and thermal management. Furthermore, we address the broader significance of
these developments in the integration of bidirectional systems, which are driving advances in circuit
architectures to better harness the energy flexibility of electric vehicles. We emphasize the critical role
of bi-directional electric vehicles in the transition toward a smart and sustainable energy grid. To
enhance accessibility for a diverse readership, we will provide concise definitions or explanations for
technical terms used throughout the paper, ensuring that our work is approachable even for those
who may not be experts in the field.
VIEW FULL TEXT:
segunda-feira, 27 de janeiro de 2025
ESTUDO DE CONVERSORES ESTÁTICOS CA-CA MONOFÁSICOS E TRIFÁSICOS BASEADOS NO PRINCÍPIO DO CAPACITOR CHAVEADO Mauricio Dalla Vecchia, Telles Brunelli Lazzarin, Ivo Barbi Universidade Federal de Santa Catarina – UFSC, Florianópolis – SC, Brasil
ESTUDO DE CONVERSORES ESTÁTICOS CA-CA MONOFÁSICOS ETRIFÁSICOS BASEADOS NO PRINCÍPIO DO CAPACITOR CHAVEADO Mauricio Dalla Vecchia, Telles Brunelli Lazzarin, Ivo BarbiUniversidade Federal de Santa Catarina – UFSC, Florianópolis – SC, Brasil e-mail: m.dallavecchia90@gmail.com, telles@inep.ufsc.com, ivobarbi@inep.ufsc.br
Resumo – Este artigo apresenta uma célula básica
bidirecional a capacitor chaveado para a conversão
direta CA-CA. A partir desta célula são discutidas duas
topologias CA-CA, uma monofásica e outra trifásica, e
proposta uma terceira topologia CA-CA trifásica com
número de interruptores reduzido, denominada deltaaberto. Essas topologias utilizam apenas capacitores e
interruptores no estágio de potência, apresentam ganho
fixo, operam em malha aberta, com valores constantes de
razão cíclica e frequência, apresentam alta eficiência e
elevada densidade de potência, típicas características de
capacitores chaveados. A principal vantagem das
topologias abordadas é a não utilização de elementos
indutivos no circuito de potência, o que reduz
significativamente o volume e peso da estrutura. Os
conversores são adequados para a implementação de
transformadores eletrônicos e possuem potencial para
substituir o autotransformador em aplicações
residenciais, comerciais e industriais. Estudo, análise e
comprovação experimental são apresentados para os
seguintes conversores: monofásico de 1 kW, trifásico de
6 kW e trifásico com conexão delta-aberto de 3,5 kW,
todos para 220 V/110 V. As topologias operam com uma
frequência de comutação de 100 kHz. Resultados
experimentais expressivos, como eficiência em torno de
93 % em plena carga, são apresentados e comprovam o
potencial de aplicação das topologias.
VIEW FULL PAPER: http://sobraep1.tempsite.ws/site/uploads/2018/06/rvol20no2p13.pdf
domingo, 26 de janeiro de 2025
Simple Method to Estimate Battery Lifetime and Upkeep of Lead-Acid and Lithium-Ion Batteries-Pedro C. Bolsi 1,2, Edemar O. Prado 1,2, Romario J. Nazaré 2, Hamiltom C. Sartori 1, José R. Pinheiro 1,2 1Universidade Federal de Santa Maria, Santa Maria - RS, Brasil 2Universidade Federal da Bahia, Salvador - BA, Brasil
Simple Method to Estimate Battery Lifetime and Upkeep of Lead-Acid and Lithium-Ion Batteries
Pedro C. Bolsi 1,2, Edemar O. Prado 1,2, Romario J. Nazaré 2, Hamiltom C. Sartori 1, José R. Pinheiro 1,2
1Universidade Federal de Santa Maria, Santa Maria - RS, Brasil
2Universidade Federal da Bahia, Salvador - BA, Brasil
e-mail: pedrobolsi@ufba.br, edemar.prado@ufba.br, romario.jesus@ufba.br, hamiltomsar@gmail.com, jrenes@gepoc.ufsm.br
ABSTRACT This work provides an event-oriented method to model and predict the lifetime of leadacid and lithium-iron phosphate batteries. An ampere-hour integration method is proposed to be used in conjunction with the event-oriented method to achieve higher accuracy. The methods are applied to lead acid and lithium-iron phosphate batteries on a commercial 1 kW single-office/home-office uninterruptible power supply (UPS). Additional circuits for measurements, or microprocessors are avoided to not increase the UPS cost, reducing its market competitiveness. The usefulness of the proposed approach is demonstrated by an upkeep analysis based on the cost of the battery and the service time for each battery technology.
VIEW FULL PAPER: https://journal.sobraep.org.br/index.php/rep/article/view/981
DOWNLOAD : https://journal.sobraep.org.br/index.php/rep/article/view/981/881
Design of Uninterruptible Power Supply Inverters for Different Modulation Techniques Using Pareto Front for Cost and Efficiency Optimization-Edemar O. Prado , Pedro C. Bolsi , Hamiltom C. Sartori and José R. Pinheiro-BRASIL
1 Energy Efficiency Lab, LABEFEA, Federal University of Bahia, Salvador 40170-110, BA, Brazil
2 Power Electronics and Control Research Group, GEPOC, Federal University of Santa Maria,
Santa Maria 97105-900, RS, Brazil
* Correspondence: edemar.prado@ufba.br
Abstract: This work presents a design for uninterruptible power supply inverters using Pareto front
optimization for improved cost and efficiency. Three PWM modulation techniques applied to the
full-bridge inverter are analyzed. As a result, the best MOSFET design solution in terms of the cost
and efficiency of the inverter is evaluated based on a database with 47 power MOSFETs. Using the
Pareto front, the optimal and sub-optimal solutions are compared, considering the three modulation
techniques and the characteristics of MOSFETs manufactured for different voltage levels. Thermal
and electrical measurements are used to validate the models.
VIEW FULL PAPER: https://www.mdpi.com/1996-1073/16/3/1314
LCL filter based high power density AC/DC converter for fast charging applications-Nguyen Dinh Tuyen, Nguyen Van Minh Tam, Truong Phuoc Hoa Department of Power Delivery, Faculty of Electrical and Electronics Engineering, Ho Chi Minh City University of Technology
Journal homepage: http://ijpeds.iaescore.com LCL filter based high power density AC/DC converter for fast charging applications Nguyen Dinh Tuyen, Nguyen Van Minh Tam, Truong Phuoc Hoa
Department of Power Delivery, Faculty of Electrical and Electronics Engineering, Ho Chi Minh City University of Technology (HCMUT), Vietnam National University (VNU), Ho Chi Minh City, Vietnam
ABSTRACT
This paper introduces a LCL filter design tailored for a 40 kW three-phase grid-connected converter utilized in electric vehicle onboard fast chargers. In contrast to conventional filters, the LCL filter finds extensive application in AC/DC converters for power factor correction, thanks to its enhanced harmonic reduction and improved stability of the system. The parameters of LCL filter are devised based on considerations such as the system’s power, the frequency of the alternating current (AC) input, and the PWM frequency, determined through simulation and comprehensive theoretical analysis. By implementing a dual-current closed-loop control strategy, the system ensures a robust response for both the current on the AC side of the converter and the voltage on the direct current (DC) side. The analysis of the system’s performance includes rapid dynamic response, system efficiency, AC current harmonic, and DC ripple voltage. Both simulation and experimental results are presented to validate the proposed design for the LCL filter.
VIEW FULL PAPER: https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/23334
A single-stage full bridgeless boost half-bridge AC/DC converter with bidirectional switch Mohamad Affan Bin Mohd Noh1, Mohd Rodhi Bin Sahid2, Vinesh Thiruchelvam3 1,3School of Engineering, Asia Pacific University of Technology & Innovation, Malaysia 1,2School of Electrical Engineering, Universiti Teknologi Malaysia, Malaysia
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol. 12, No. 4, December 2021, pp. 2336~2348 ISSN: 2088-8694, DOI: 10.11591/ijpeds.v12.i4.pp2336-2348
A single-stage full bridgeless boost half-bridge AC/DC converter with bidirectional switch
Mohamad Affan Bin Mohd Noh1, Mohd Rodhi Bin Sahid2, Vinesh Thiruchelvam3
1,3School of Engineering, Asia Pacific University of Technology & Innovation, Malaysia
1,2School of Electrical Engineering, Universiti Teknologi Malaysia, Malaysia
ABSTRACT
Article history:
Received Mar 22, 2021
Revised Oct 18, 2021
Accepted Oct 25, 2021
This paper proposed an isolated full bridgeless single stage alternating current-direct current (AC-DC) converter. The proposed converter integrates the operation of a pure bridgeless power factor correction with input boost inductor cascaded with center-tap transformer and half bridge circuit. In addition, the bidirectional switch can be driven with single control signal which further simplifies the controller circuit. It was proven that this converter reduced the total number of components compared to some conventional circuit and semi-bridgeless circuit topologies. The circuit operation of the proposed circuit was then confirmed with the small signal model, large signal model, circuit simulation and then verified experimentally. It was designed and tested at 115 Vac, 50 Hz of input supply, and 20 Vdc output voltage with maximum output power of 100 W. In addition, the crossover distortion at the input current was minimized at high input line frequency.
VIEW FULL TEXT: https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/21269
sexta-feira, 24 de janeiro de 2025
quinta-feira, 23 de janeiro de 2025
Paralelismo de inversores de tensão aplicado a Nobreaks: teoria, estratégias de controle e exemplo de projeto-Autor: Telles B. Lazzarin Ano: 2012 - INSTITUTO FEDERAL SANTA CATARINA-BRASIL
EXCELENTE APORTE CIENTIFICO DO DR. TELLES B. LAZZARIN UM LIVRO ESPECIALMENTE UTIL PARA ESTUDANTES,ENGENHEIROS DE GRADUAÇÃO E POS-GRADUAÇÃO DE ENGENHARIA ELETRICA E ELETRÔNICA
President of the Brazilian Association of Power Electronics (SOBRAEP) Coordinator of the Postgraduate Program in Electrical Engineering at UFSC (PPGEEL) Professor at the Federal University of Santa Catarina (UFSC) Universidade Federal de Santa Catarina Universidade Federal de Santa Catarina Santa Catarina, Brazil.
LIVRO PDF COMPLETO:
quarta-feira, 22 de janeiro de 2025
An Active AC Grid to DC Microgrid Interface Using a Bidirectional Bridgeless Flyback Converter Pablo J. Quintana-Barcia*, Jorge Garcia, Manuel Rico-Secades and Emilio L. Corominas University of Oviedo, Department of Electrical, Electronic, Computers and Systems Engineering, Spain
Abstract
The usage of power electronics in power systems is one of the key
techniques for boosting the development of microgrids. Particularly,
in the case of public lighting systems, power electronics converters
are applied to both the LED driving stage and the grid interfacing
stage. From the point of view of the grid, the latter stage usually
behaves as a high power factor (PF) load. However, recent
trends in these systems imply a manifold of different storage and
renewable energy microgeneration units connected to the DC
bus of each street lamp. All together are usually known as lighting
smartgrids. The present work aims for keeping the DC bus stable,
injecting or extracting energy whereas maintaining high PF with
respect to the AC grid. This idea is performed by means of a
power droop control that provides the current reference to the
grid-tie power converter: a bidirectional bridgeless discontinuous
conduction mode (DCM) Flyback converter. This paper defines,
explains and implements a power droop control as well as a
novel unified switching pattern for the bidirectional DCM Flyback
converter, suitable for both inverter and rectifier operating
modes. Another contribution is that the proposed switching
pattern enables for a smooth transition between these modes.
The proposed strategy provides the pulses for every switch at the
interfacing stage in the adequate sequence, thus simplifying the
design and implementation of the power and control stages. The
proposed switching pattern is validated through experimental
results.
VIEW FULL TEXT:
Input Stage with Double Functionality Applied to a High Performance Three-Phase UPS William A. Venturini, Henrique Jank, Fábio E. Bisogno, Mário L. S. Martins, Humberto Pinheiro ESTÁGIO DE ENTRADA COM DUPLA FUNCIONALIDADE APLICADO A UMA UPS TRIFÁSICA DE ALTO DESEMPENHO William A. Venturini, Henrique Jank, Fábio E. Bisogno, Mário L. S. Martins, Humberto Pinheiro Universidade Federal de Santa Maria, Santa Maria – RS, Brasil
Desempenho Input Stage with Double Functionality Applied to a High Performance Three-Phase UPS William A. Venturini, Henrique Jank, Fábio E. Bisogno, Mário L. S. Martins, Humberto Pinheiro ESTÁGIO DE ENTRADA COM DUPLA FUNCIONALIDADE APLICADO A UMA UPS TRIFÁSICA DE ALTO DESEMPENHO William A. Venturini, Henrique Jank, Fábio E. Bisogno, Mário L. S. Martins, Humberto Pinheiro Universidade Federal de Santa Maria, Santa Maria – RS, Brasil e-mail: {williamventurini, hiquejank, fbisogno, mariolsm, humberto.ctlab.ufsm.br}@gmail.com
Resumo – Este trabalho apresenta uma configuração
topológica que permite utilizar o estágio de entrada de
uma UPS de dupla conversão como retificador trifásico,
em modo normal de operação, e como conversor CC/CC
elevador de tensão, em modo bateria. Dessa forma, evita-se
o uso de um circuito específico para a descarga do banco
de baterias, o qual deve ser dimensionado para a potência
nominal da UPS. É apresentada a análise de
funcionamento do estágio de entrada proposto, bem como
a modelagem matemática e o sistema de controle que
garantem a aplicabilidade na correção do fator de potência
de entrada, no controle da tensão de barramento e ainda
no equilíbrio das tensões sobre os capacitores de
barramento. A metodologia desenvolvida e a boa
performance do sistema proposto são validados através de
resultados obtidos em uma plataforma hardware-in-theloop,
modelo Typhoon HIL402. Os resultados são
adquiridos para uma UPS trifásica de 20 kVA.
INPUT STAGE WITH DOUBLE
FUNCTIONALITY APPLIED TO A HIGH
PERFORMANCE THREE-PHASE UPS
Abstract – This work presents a topological
configuration that allows the input stage of a double
conversion UPS to be used as a three-phase rectifier and
a DC/DC voltage boost converter in normal and backup
operating mode, respectively. Thus, the use of a specific
circuit for the discharge of the battery bank, which would
be rated for UPS nominal power, is avoided. The
operation analysis of the proposed input stage is
presented, as well as the mathematical modeling and the
control system that guarantee the applicability in the
input power factor correction, DC bus voltage control
and for the DC bus capacitors voltage balance.
Hardware-in-the-loop results are acquired for a 20 kVA
three-phase UPS to validate the developed analysis besides
to demonstrate the good performance of the system.
VIEW FULL PAPER PAGE 244-255: https://sobraep.org.br/site/uploads/2019/04/rvol23no02.pdf
terça-feira, 21 de janeiro de 2025
Isolated Single-stage Three-phase AC/DC Converter using Bidirectional Switches Ramandeep Narwal† , Isaac Wongx , Subhashish Bhattacharya‡ , B. Jayant Baliga§ and Douglas C. Hopkins∗ FREEDM Systems Center, Department of Electrical and Computer Engineering North Carolina State Univers
Isolated Single-stage Three-phase AC/DC Converter using Bidirectional Switches Ramandeep Narwal† , Isaac Wongx , Subhashish Bhattacharya‡ , B. Jayant Baliga§ and Douglas C. Hopkins∗ FREEDM Systems Center, Department of Electrical and Computer Engineering North Carolina State University Raleigh, NC 27695, USA
Abstract—The advent of the SiC Bidirectional FET (BiDFET), a monolithic 1.2 kV bidirectional switch, has rendered the single-stage three-phase AC/DC converter topology a promising approach for implementing AC/DC converters. This topology, which integrates a full-bridge converter with a single-phase to three-phase matrix converter via a high-frequency transformer, is particularly suitable for applications requiring galvanic isolation, buck-boost functionality, and bidirectional power flow. The single-stage design eliminates the need for bulky and unreliable electrolytic capacitors, and utilizes a single magnetic component for power transfer. In the matrix converter, bidirectional switches, which were traditionally implemented using combinations of multiple semiconductor devices such as MOSFETs, IGBTs, and diodes, can now be realized using the single-chip solution, BiDFET. This advancement leads to a lower switch count, compact converter implementation, with lower inductance commutation cells, thereby enhancing the overall efficiency and compactness of the system. The paper presents a unified model of the converter, considering all control parameters, including the duty cycles and phase shift of transformer voltages. Detailed expressions for power transfer, transformer currents, and currents at AC and DC ports are provided. Additionally, the paper outlines the conditions necessary for soft-switching of all switches and the commutation schemes required for the practical implementation of the matrix converter modulation scheme. A hardware prototype of a 10 kW, 480 VRMS, LL/ 800 V AC/DC system has been developed, and experimental results are presented to demonstrate its performance.
VIEW FULL PAPER: https://www.osti.gov/servlets/purl/2324747
Planar Transformer Systems for Modular Power Electronics in Long-Haul, Low-Cost PV Systems-Mike K. Ranjram Title: Assistant Professor-Arizona State University
Planar Transformer Systems for Modular Power Electronics in Long-Haul, Low-Cost PV Systems Mike K. Ranjram Title: Assistant Professor-Arizona State University
Background
The aim of this project is to develop and verify a new approach to designing
medium-voltage (MV) planar transformers for emerging, utility-scale, modular PV
systems. This approach considers these MV planar transformers as systems rather than
as components. This means they can comprise multiple individual magnetic cores and
printed circuit boards (PCBs) which can be distinctly organized both electrically and
physically to achieve maximum performance. Central to this approach is that lowcomplexity winding stack-ups are leveraged which simplify primary-to-secondary
insulation requirements, mitigate the need for interleaved windings, and aid in
streamlining manufacturing and greatly reducing cost. Additionally, these systems
dramatically expand the available material choices for the PCB by significantly reducing
their required dielectric strength. This is a key driver of low-cost PCBs and mitigates
sensitivity to supply chain changes in any particular material.
The three key aspects of a medium voltage planar transformer in a solar PV
application are its: (1) isolation capability, (2) cost, and (3) loss. This project
comprehensively explores each of these three facets and we ultimately advance planar
transformers having higher isolation capability, much lower cost, and lower loss than the
state-of-the-art, at a comparable and lower volume. In this section, we provide
background on each of these three key facets of the design.
VIEW FULL PAPER:https://www.osti.gov/servlets/purl/2452814
Design and Qualification of a 100 kW Three-Phase SiC-Based Generator Rectifier Unit Rated for 50,000 ft Altitude Jiewen Hu, Member, IEEE, Xingchen Zhao, Student Member, IEEE, Lakshmi Ravi, Student Member, IEEE, Rolando Burgos, Senior Member, IEEE, Dong Dong,
VIEW FULL PAPER: https://www.osti.gov/servlets/purl/2446561
segunda-feira, 20 de janeiro de 2025
Optimal Design of MHz LLC Converter for 48V Bus Converter Application Yinsong Cai, Student Member, IEEE, Mohamed H. Ahmed, Student Member, IEEE, Qiang Li, Member, IEEE, and Fred C. Lee, Life Fellow, IEEE
Optimal Design of MHz LLC Converter for 48V Bus Converter Application Yinsong Cai, Student Member, IEEE, Mohamed H. Ahmed, Student Member, IEEE, Qiang Li, Member, IEEE, and Fred C. Lee, Life Fellow, IEEE
Abstract—Intermediate bus architecture employing 48V bus
converters is widely used in power supply applications. With
the rapid increase of demanded power by these loads, higher
efficiency and power density are driving better performance
power management solutions. In this paper, a Gallium Nitride
(GaN) based design of a two-stage solution is proposed. The
first stage is a multi-phase Buck for regulation. The second
stage is an LLC converter with fixed switching frequency for
isolation. The detailed design and optimization of the LLC
converter are studied. To achieve high power density and high
efficiency, the transformer design becomes critical at MHz
frequency. The matrix transformer concept is applied and a
merged winding structure is used for flux cancellation, which
effectively reduces the AC winding losses. A novel primary
termination and via structure is proposed, resulting in great loss
reduction. In addition, to study the current sharing of parallel
winding layers, a 1-Dimensional analytic model is proposed, and a
symmetrical winding layer scheme is used to balance the current
distribution. Finally, the prototype for the two-stage bus converter
is developed, with the peak efficiency of 96% and power density
of 615W/in3.
VIEW FULL PAPER: https://www.osti.gov/servlets/purl/1799217
domingo, 19 de janeiro de 2025
Twelve-Step Voltage Source Inverter: A Three-Phase Six-Levels Inverter Using Planar Transformers Haitham KANAKRI, Euzeli Cipriano DOS SANTOS JR., and Maher RIZKALLA
Twelve-Step Voltage Source Inverter: A Three-Phase Six-Levels Inverter Using Planar Transformers Haitham KANAKRI, Euzeli Cipriano DOS SANTOS JR., and Maher RIZKALLA
Abstract—Multi-level inverters (MLIs) are becoming increasingly popular in high-speed motor drive systems for modern electric aircraft applications. However, two significant limitations are associated with current MLIs technology: (1) the high switching losses due to the high carrier switching frequency and (2) the complex modulation schemes required to maximize the DC source utilization. Consequently, the development of new topologies to mitigate these limitations is imperative for the rapid advancement of future electric aircraft systems. This paper introduces a six-level twelve-step inverter (TSI) that utilizes twelve switches and three planar high-frequency transformers. Implementing the proposed configuration ensures maximum DC source utilization, with a peak phase voltage of 5Vdc / 3. The proposed solution presents less semiconductor losses than the conventional MLIs, surpassing conventional MLIs, associated with neutral point clamped (NPC), flying capacitor (FC), and cascaded H-bridge (CHB). Experimental results demonstrate the TSI’s operation under static and dynamic conditions and its capability to function in three different modes: three-step, six-step, and twelve-step operations. The paper also offers a comprehensive design of the proposed planar transformer, supported by theoretical analysis, finite element analysis (FEA), and experimental validation.
VIEW FULL TEXT WEB: Page 263-273
https://file.cpss.org.cn/uploads/allimg/20240927/CPSS%20TPEA%20V9N3.pdf
Design and Analysis of a Three-Phase High-Frequency Transformer for Three-Phase Bidirectional Isolated DC-DC Converter Using Superposition Theorem-by Yasir S. Dira ,Ahmad Q. Ramli ,Nadia M. L. Tan,and Giampaolo Buticchi
Design and Analysis of a Three-Phase High-Frequency Transformer for Three-Phase Bidirectional Isolated DC-DC Converter Using Superposition Theorem-by Yasir S. Dira ,Ahmad Q. Ramli ,Nadia M. L. Tan,and Giampaolo Buticchi Institute of Power Engineering, Universiti Tenaga Nasional, Kajang 43000, Malaysia; yasirsabah291@gmail.com (Y.S.D.); qisti@uniten.edu.my (A.Q.R.) 2 Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China
Abstract: Battery energy storage systems based on bidirectional isolated DC-DC converters (BIDCs)
have been employed to level the output power of intermittent renewable energy generators and
to supply power to electric vehicles. Moreover, BIDCs use high-frequency transformers (HFTs) to
achieve voltage matching and galvanic isolation. Various studies have recently been conducted using
soft magnetic materials, such as nanocrystalline, amorphous solids, and ferrite, to develop more
compact and effective transformers with superior power densities. The HFTs in three-phase BIDCs
are composed of three magnetic cores. However, this leads to low power density and high cost.
Besides, the three-phase (3P) ferrite core has not been investigated for high-power converters such
as 3P-BIDCs. This paper presents the design and development of a 3P-EE ferrite magnetic core for
3P-BIDCs. The area product design method was used to determine the core and winding design. The
paper also proposes the use of the superposition theorem in conducting a magnetic circuit analysis
to predict the flux density and magnetising inductance of the transformer core. Moreover, the use
of the superposition theorem allowed the required air-gap length for balancing the distribution of
flux density and magnetizing inductance in the transformer core to be determined. The balanced
flux distribution and magnetizing inductance resulted in a uniform core loss and temperature in the
transformer. This paper also presents the experimental results of the designed HFT operated in a
300-V, 3-kW 3P-BIDC. The experimental results showed that the proposed HFT achieved a balanced
flux density and magnetizing inductance with a high power density and low cost. Moreover, the
transformer performed at a maximum efficiency of 98.67%, with a decrease of 3.33 ◦C in the overall
temperature of the transformer as compared to the transformer without air gaps.
VIEW FULL TEXT: https://www.mdpi.com/2071-1050/16/21/9227
sábado, 18 de janeiro de 2025
Power Losses Analysis of Multiphase Interleaved DC-DC Boost Converter using OrCAD PSpiceSoftware-A.A.Bakar Department of Electrical Engineering Universiti Tun Hussein Onn Malaysia-T.Sithananthan Department of Electrical Engineering Universiti Tun Hussein Onn Malaysia
Power Losses Analysis of Multiphase Interleaved DC-DC Boost Converter using OrCADPSpiceSoftware
A.A.Bakar Department of Electrical Engineering Universiti Tun Hussein Onn Malaysia Johor, Malaysia afarul@uthm.edu.my
S.SaimanDepartment of Electrical Engineering Universiti Tun Hussein Onn Malaysia Johor, MalaysiaT.SithananthanDepartment of Electrical Engineering Universiti Tun Hussein Onn Malaysia Johor, Malaysia tharnisha97@gmail.com
A.F.H.A.Gani Department of Electrical Engineering Universiti Tun Hussein Onn Malaysia Johor, Malaysia
Abstract—DC-DC converters with multiphase structures are widely used in electrical and electronic devices because of their advantages over conventional boost converters, such as reduction in input current ripple and low conduction loss. As technology advances, more delicate needs have to be fulfilled for better load performance. Traditional boost converters are still feasible but with certain drawbacks, such as high current ripples, significant switching losses, and high switch voltage stresses. This paper presents a novel multiphase DC-DC boost converter, with an output power range between 50 Watts to 200 Watts. The number of phases for this multiphase boost converter is limited to 5-phase. This paper focuses on power losses in the converter, namely conduction losses in diodes and MOSFET, switching losses in MOSFETs, as well as losses in inductors and capacitors. The discussion includes an analysis of the relationships between multiphase boost converters in terms of the number of phases and power loss. Simulation results show that the 3-phase DC-DC boost converter contributed to the least losses (at P=200 Watts) with the efficiency of 94.09 %, in addition to the smaller number of components used; by comparison between 3-phase and 4-phase. The performance analysis was done using OrCAD PSpice software.
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The Analysis and Comparison of Leakage Inductance in Different Winding Arrangements for Planar Transformer Ziwei Ouyang, Ole C. Thomsen, Michael A. E. Andersen Department of Electrical Engineering, Technical University of Denmark
The Analysis and Comparison of Leakage Inductance in Different Winding Arrangements for Planar Transformer Ziwei Ouyang, Ole C. Thomsen, Michael A. E. Andersen Department of Electrical Engineering, Technical University of Denmark
Abstract -- The coupling of the windings can be easily
increased by using multiply stacked planar windings connection.
Interleaving is a well-known technique used to reduce leakage
inductance and minimize high-frequency winding losses. The
paper aims to analyze leakage inductance based on magneto
motive force (MMF) and energy distribution in planar
transformer and correct the formula of leakage inductance
proposed by previous publications. The investigation of different
winding arrangements shows significant advantages of
interleaving structure. In this work, a novel half turn structure
is proposed to reduce leakage inductance further. Some
important issues are presented to acquire desired leakage
inductance. The design and modeling of 1 kW planar
transformer is presented. In order to verify the analytical
method for leakage inductance in this paper, finite element
analysis (FEA) and measurement with impedance analyzer are
presented. Good matching between calculation, FEA 2D
simulation and measurement results is achieved.
quinta-feira, 16 de janeiro de 2025
DESIGN AND DEVELOPMENT OF UPS FOR MARINE POWER SYSTEMS-V. Samsygin1, D. Sokolov, D. Ulitovsky, M. Sergeev, A. Martynov - TSNII SET Branch, Krylov State Research Centre, St. Petersburg, Russia 2 St. Petersburg University of Aerospace Engineering, Russia
DESIGN AND DEVELOPMENT OF UPS FOR MARINE POWER SYSTEMS
Object and purpose of research. This paper discusses uninterruptable power supplies (UPS) developed by TSNII
SET for marine power systems. The purpose of the study is to compare the results of UPS developments and outline the directions
of their further improvement.
For citation:Samsygin V.K., Sokolov D.V., Ulitovsky D.I., Sergeev M.Yu., Martynov A.A. Development and co-
Building of uninterruptible power supplies for marine power supply systems. Proceedings of the Krylov State
Research Center. 2019; 2(388): 101–111.
Труды Крыловского государственного научного центра. Т. 2, № 388. 2019
Transactions of the Krylov State Research Centre. Vol. 2, no. 388. 2019
VIEW ORIGINAL VERSION (RUSSIAN) : https://www.mediafire.com/file/934bv4jq5cxz95p/DESIGN+AND+DEVELOPMENT+OF+UPS+FOR+MARINE+POWER+SYSTEMS+.pdf/file
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