This document summarizes a proposed soft-switching DC/DC converter with high voltage gain. The proposed converter uses zero-voltage switching (ZVS) and zero current switching (ZCS) techniques to reduce switching losses and improve efficiency. It provides a continuous input current and high voltage gain using a coupled inductor cell. Experimental results on a 200W prototype show the converter achieves soft switching and provides a 24V to 360V conversion with high efficiency.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Abstract: AC-DC soft-switching resonant converter with interleaved boost power factor corrector (PFC) is presented. In this converter, an interleaved boost PFC circuit is integrated with a soft-switching resonant converter. High power factor is achieved by the interleaved boost PFC circuit. The input current can be shared among the inductors so that high reliability, power factor and efficiency in power system can be obtained and ripples are also reduced. Another advantage of interleaved technique is reduction of THD. Thus the converter performance can be improved. The voltage across the main switches is confined to the dc-link voltage. Soft-switching operation of main switches and output diodes is achieved. Hence the switching losses are reduced significantly. Therefore, the overall efficiency is improved. Circuit is simulated with 110V AC input voltage and 45V DC output voltage is verified. Performance parameters such as voltage stress and output ripple are also analyzed. The simulation is done in PSIM. Power factor of 0.96 is achieved with this converter. For the hardware, dsPIC30F2010 is used for generating PWM pulse with switching frequency 90 kHz.
Keywords: Power factor correction (PFC), Soft switching, Resonant converter, Interleaved Boost converter.
Title: Resonant AC-DC Converter with Interleaved Boost PFC
Author: Aqulin Ouseph, Prof. Kiran Boby, Prof. Neena Mani
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications
Review of Step down Converter with Efficient ZVS OperationIJRST Journal
This paper presents the review of step down converter with efficient ZVS operation. The designed buck converter uses ZCS technique and the function is realized so that the power form is converted from 12V DC 5V DC (1A). A detailed analysis of zero current switching buck converters is performed and a mathematical analysis of the mode of operation is also presented. In order to reduce the switching losses in associated with conventional converters; resonant inductor and resonant capacitor (LC resonant circuit) is applied which helps to turn on-off the switch at zero current. The dc-dc buck converter receives the energy from the input source, when the switch is turned-on. The buck–buck converters have characteristics that warrant a more detailed study. The buck converters under discontinuous conduction mode /continuous conduction mode boundary.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Abstract: AC-DC soft-switching resonant converter with interleaved boost power factor corrector (PFC) is presented. In this converter, an interleaved boost PFC circuit is integrated with a soft-switching resonant converter. High power factor is achieved by the interleaved boost PFC circuit. The input current can be shared among the inductors so that high reliability, power factor and efficiency in power system can be obtained and ripples are also reduced. Another advantage of interleaved technique is reduction of THD. Thus the converter performance can be improved. The voltage across the main switches is confined to the dc-link voltage. Soft-switching operation of main switches and output diodes is achieved. Hence the switching losses are reduced significantly. Therefore, the overall efficiency is improved. Circuit is simulated with 110V AC input voltage and 45V DC output voltage is verified. Performance parameters such as voltage stress and output ripple are also analyzed. The simulation is done in PSIM. Power factor of 0.96 is achieved with this converter. For the hardware, dsPIC30F2010 is used for generating PWM pulse with switching frequency 90 kHz.
Keywords: Power factor correction (PFC), Soft switching, Resonant converter, Interleaved Boost converter.
Title: Resonant AC-DC Converter with Interleaved Boost PFC
Author: Aqulin Ouseph, Prof. Kiran Boby, Prof. Neena Mani
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications
Review of Step down Converter with Efficient ZVS OperationIJRST Journal
This paper presents the review of step down converter with efficient ZVS operation. The designed buck converter uses ZCS technique and the function is realized so that the power form is converted from 12V DC 5V DC (1A). A detailed analysis of zero current switching buck converters is performed and a mathematical analysis of the mode of operation is also presented. In order to reduce the switching losses in associated with conventional converters; resonant inductor and resonant capacitor (LC resonant circuit) is applied which helps to turn on-off the switch at zero current. The dc-dc buck converter receives the energy from the input source, when the switch is turned-on. The buck–buck converters have characteristics that warrant a more detailed study. The buck converters under discontinuous conduction mode /continuous conduction mode boundary.
A New Active Snubber Circuit for PFC ConverterIDES Editor
In this paper, a new active snubber circuit is
developed for PFC converter. This active snubber circuit
provides zero voltage transition (ZVT) turn on and zero current
transition (ZCT) turn off for the main switch without any
extra current or voltage stresses. Auxiliary switch turns on
and off with zero current switching (ZCS) without voltage
stress. Although there is a current stress on the auxiliary
switch, it is decreased by diverting it to the output side with
coupling inductance. The proposed PFC converter controls
output current and voltage in very wide line and load range.
This PFC converter has simple structure, low cost and ease of
control as well. In this study, a detailed steady state analysis
of the new converter is presented, and the theoretical analysis
is verified exactly by 100 kHz and 300 W prototype. This
prototype has 98% total efficiency and 0.99 power factor with
sinusoidal current shape.
This paper presents the simulation design of dc/dc interleaved boost converter with zero-voltage switching (ZVS). By employin the interleaved structure, the input current stresses to switching devices were reduced and this signified to a switching conduction loss reduction. All the parameters had been calculated theoretically. The proposed converter circuit was simulated by using MATLAB/Simulink and PSpice software programmes. The converter circuit model, with specifications of output power of 200 W, input voltage range from 10~60 V, and operates at 100 kHz switching frequency was simulated to validate the designed parameters. The results showed that the main switches of the model converter circuit achieved ZVS conditions during the interleaving operation. Consequently, the switching losses in the main switching devices were reduced. Thus, the proposed converter circuit model offers advantages of input current stress and switching loss reductions. Hence, based on the designed parameters and results, the converter model can be extended for hardware implementation.
Low Current Ripple, High Efficiency Boost Converter with Voltage MultiplierIJMTST Journal
An innovative high voltage-gain boost converter, which is made for home inverters contains the combination
of switched capacitors and coupled inductors made a voltage multiplier, which is used to increase the output
gain of a traditional converter abnormally without using an excessive switching frequency. The setup not only
maximizes the efficiency but also eliminates input current ripple almost, which deduces conduction losses
and current stress of switches causes to greater extension of input source lifetime. In addition, due to the
lossless passive clamp performance, leakage energy is recycled to the output terminal. Hence, large voltage
spikes across the main switches are alleviated, and the efficiency is improved. Even the low voltage stress
makes the low-voltage-rated MOSFETs be embraced for reductions conduction losses and expense.
Ultimately, the prototype circuit with 24-V input voltage, 230-V output, and 1000-W output power is operated
to verify its performance. The greatest effectiveness is 97.1 %.
A power supply is a component that supplies power to at least one electric load. Typically, it converts one type of electrical power to another, but it may also convert a different form of energy – such as solar, mechanical, or chemical - into electrical energy. A power supply provides components with electric power.
An Active Input Current Waveshaping with Zero Switching Losses for Three-Phas...IDES Editor
In this paper a zero voltage switched active network
(Fig. 1) which can be used in conjunction with single-phase or
three-phase ac to dc diode rectifiers is presented. It is shown
that application of the proposed switching network in threephase
ac to dc boost converter yields zero switching losses
while maintaining a unity input power factor. Active network
capacitor, Cs, diodes D7, and D8, maintain a zero voltage during
turn-off of Q1, and Q2, Capacitor, Cs, discharges through
the boost inductors of the circuit thus limiting the rate of rise
of current during turn-on. Moreover, the advantage of the
proposed active network is that it can maintain a zero voltage
switching over the entire range of the duty cycle of the operation.
Consequently, boost stage can be used directly to control
the dc bus voltage by varying the duty cycle at Constant switching
frequency. The resulting advantages include higher
switching frequencies, and better efficiency. Finally the operation
of the active switching network is verified experimentally
on a prototype three-phase ac to dc converter.
A DC-DC converter topology is presented
combining the soft switching effects of the Snubber Assisted Zero
Voltage and Zero Current Transition (SAZZ) topology and the
increased inductor frequency of the dual interleaved boost
converter with interphase transformer. The snubber capacitors
and output capacitances of the main devices are discharged prior
to turn on using a single auxiliary inductor, eliminating turn on
losses. Furthermore, the turn off losses are significantly reduced
since the energy stored in the device output capacitance at turn
off is recovered at turn on. The effectiveness of the topology is
demonstrated on a SiC prototype operating at 12.5 kW, 112 kHz,
reducing the switching losses by 50%.
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Abstract: An Interleaved Buck Converter (IBC) with continuous input current, extremely low output current ripple, low switching losses and improved step-down conversion ratio is presented in this work. The new interleaved buck converter has lower voltage stress in comparison to the conventional IBC and also can provide a high step-down ratio which makes it a proper choice for high power applications. Also new interleaved buck converter can provide current-sharing between two interleaved modules without using additional current-sharing control method. The new interleaved buck converter is simulated by using MATLAB/Simulink and the experimental results can be obtained.
Keywords: Two Phase Interleaved Buck Converter, Continuous Conduction Mode, low switching voltage stress.
Title: Comparative Study of Interleaved Buck Converters
Author: Vinny Babu, Prof. Ninu Joy, Prof. Honey Susan Eldo
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications
IMPLEMENTATION OF DISCONTINUOUS INDUCTOR CURRENT MODE IN CUK CONVERTERS FED B...Journal For Research
This paper presents a bridgeless Cuk converter-fed brushless DC (BLDC) motor drive. A Bridgeless Cuk converter is constructed to operate at discontinuous inductor current mode to improve the quality of power and power factor at the AC mains for better speed control. The bridgeless converter is designed for obtaining the low conduction losses and requirement of low size of heat sink for the switches. TI-TMS320-F2812-based Digital Signal Processor (DSP) is used for the development of the hardware prototype of proposed BLDC motor drive.
Prof. Cuk invited talk at APEC 2011 plenary session to celebrate
35 years of his creation of this modeling and analysis method.
This talk was also recorded on video by IEEE.tv and can be viewed together. Here is a link to that video.
https://youtu.be/BLx57J2fF5w
Note: first few minutes of the video is Prof. Cuk's interview made after his presentation. This is thern followed by full 25 minutes presentation, which can be followed by the enclosed 67 slides.
A New Active Snubber Circuit for PFC ConverterIDES Editor
In this paper, a new active snubber circuit is
developed for PFC converter. This active snubber circuit
provides zero voltage transition (ZVT) turn on and zero current
transition (ZCT) turn off for the main switch without any
extra current or voltage stresses. Auxiliary switch turns on
and off with zero current switching (ZCS) without voltage
stress. Although there is a current stress on the auxiliary
switch, it is decreased by diverting it to the output side with
coupling inductance. The proposed PFC converter controls
output current and voltage in very wide line and load range.
This PFC converter has simple structure, low cost and ease of
control as well. In this study, a detailed steady state analysis
of the new converter is presented, and the theoretical analysis
is verified exactly by 100 kHz and 300 W prototype. This
prototype has 98% total efficiency and 0.99 power factor with
sinusoidal current shape.
This paper presents the simulation design of dc/dc interleaved boost converter with zero-voltage switching (ZVS). By employin the interleaved structure, the input current stresses to switching devices were reduced and this signified to a switching conduction loss reduction. All the parameters had been calculated theoretically. The proposed converter circuit was simulated by using MATLAB/Simulink and PSpice software programmes. The converter circuit model, with specifications of output power of 200 W, input voltage range from 10~60 V, and operates at 100 kHz switching frequency was simulated to validate the designed parameters. The results showed that the main switches of the model converter circuit achieved ZVS conditions during the interleaving operation. Consequently, the switching losses in the main switching devices were reduced. Thus, the proposed converter circuit model offers advantages of input current stress and switching loss reductions. Hence, based on the designed parameters and results, the converter model can be extended for hardware implementation.
Low Current Ripple, High Efficiency Boost Converter with Voltage MultiplierIJMTST Journal
An innovative high voltage-gain boost converter, which is made for home inverters contains the combination
of switched capacitors and coupled inductors made a voltage multiplier, which is used to increase the output
gain of a traditional converter abnormally without using an excessive switching frequency. The setup not only
maximizes the efficiency but also eliminates input current ripple almost, which deduces conduction losses
and current stress of switches causes to greater extension of input source lifetime. In addition, due to the
lossless passive clamp performance, leakage energy is recycled to the output terminal. Hence, large voltage
spikes across the main switches are alleviated, and the efficiency is improved. Even the low voltage stress
makes the low-voltage-rated MOSFETs be embraced for reductions conduction losses and expense.
Ultimately, the prototype circuit with 24-V input voltage, 230-V output, and 1000-W output power is operated
to verify its performance. The greatest effectiveness is 97.1 %.
A power supply is a component that supplies power to at least one electric load. Typically, it converts one type of electrical power to another, but it may also convert a different form of energy – such as solar, mechanical, or chemical - into electrical energy. A power supply provides components with electric power.
An Active Input Current Waveshaping with Zero Switching Losses for Three-Phas...IDES Editor
In this paper a zero voltage switched active network
(Fig. 1) which can be used in conjunction with single-phase or
three-phase ac to dc diode rectifiers is presented. It is shown
that application of the proposed switching network in threephase
ac to dc boost converter yields zero switching losses
while maintaining a unity input power factor. Active network
capacitor, Cs, diodes D7, and D8, maintain a zero voltage during
turn-off of Q1, and Q2, Capacitor, Cs, discharges through
the boost inductors of the circuit thus limiting the rate of rise
of current during turn-on. Moreover, the advantage of the
proposed active network is that it can maintain a zero voltage
switching over the entire range of the duty cycle of the operation.
Consequently, boost stage can be used directly to control
the dc bus voltage by varying the duty cycle at Constant switching
frequency. The resulting advantages include higher
switching frequencies, and better efficiency. Finally the operation
of the active switching network is verified experimentally
on a prototype three-phase ac to dc converter.
A DC-DC converter topology is presented
combining the soft switching effects of the Snubber Assisted Zero
Voltage and Zero Current Transition (SAZZ) topology and the
increased inductor frequency of the dual interleaved boost
converter with interphase transformer. The snubber capacitors
and output capacitances of the main devices are discharged prior
to turn on using a single auxiliary inductor, eliminating turn on
losses. Furthermore, the turn off losses are significantly reduced
since the energy stored in the device output capacitance at turn
off is recovered at turn on. The effectiveness of the topology is
demonstrated on a SiC prototype operating at 12.5 kW, 112 kHz,
reducing the switching losses by 50%.
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Abstract: An Interleaved Buck Converter (IBC) with continuous input current, extremely low output current ripple, low switching losses and improved step-down conversion ratio is presented in this work. The new interleaved buck converter has lower voltage stress in comparison to the conventional IBC and also can provide a high step-down ratio which makes it a proper choice for high power applications. Also new interleaved buck converter can provide current-sharing between two interleaved modules without using additional current-sharing control method. The new interleaved buck converter is simulated by using MATLAB/Simulink and the experimental results can be obtained.
Keywords: Two Phase Interleaved Buck Converter, Continuous Conduction Mode, low switching voltage stress.
Title: Comparative Study of Interleaved Buck Converters
Author: Vinny Babu, Prof. Ninu Joy, Prof. Honey Susan Eldo
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications
IMPLEMENTATION OF DISCONTINUOUS INDUCTOR CURRENT MODE IN CUK CONVERTERS FED B...Journal For Research
This paper presents a bridgeless Cuk converter-fed brushless DC (BLDC) motor drive. A Bridgeless Cuk converter is constructed to operate at discontinuous inductor current mode to improve the quality of power and power factor at the AC mains for better speed control. The bridgeless converter is designed for obtaining the low conduction losses and requirement of low size of heat sink for the switches. TI-TMS320-F2812-based Digital Signal Processor (DSP) is used for the development of the hardware prototype of proposed BLDC motor drive.
Prof. Cuk invited talk at APEC 2011 plenary session to celebrate
35 years of his creation of this modeling and analysis method.
This talk was also recorded on video by IEEE.tv and can be viewed together. Here is a link to that video.
https://youtu.be/BLx57J2fF5w
Note: first few minutes of the video is Prof. Cuk's interview made after his presentation. This is thern followed by full 25 minutes presentation, which can be followed by the enclosed 67 slides.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
A Comparative Study of Various AC-DC Converters for Low Voltage Energy Harves...paperpublications3
Abstract: Electromagnetic microscale and mesoscale power generators with low voltage outputs are now widely used as kinetic energy harvesters. The extrinsic vibrations on the generator can excite the internal oscillations between the proof mass magnet and the electrical damper coils. These oscillations produce a periodically varying magnetic flux in coil, inducing a corresponding AC output voltage. This output can be converted to dc and can be used to supply power to electronic loads. The conventional AC-DC converters for energy harvesting system with diode rectifiers suffer considerable voltage drop resulting increase in power loss of circuitry and complexity. As a remedy various bridgeless boost converters were designed and implemented. Standard H bridge converter with 4 switch or 2 switch, dual polarity boost converters, parallel combination of boost and buck-boost converter, integrated boost and buck-boost combination bridgeless rectifier are some of these. These circuits are studied, simulated and compared. The simulation models are drawn and simulated using MATLAB R2010a.
NON-ISOLATED SOFT SWITCHING DC-DC CONVERTER AND LOAD AT FULL RANGE OF ZVS IAEME Publication
A non isolated soft switching DC–DC converter and load at full range of zero-voltage
switching (ZVS) characteristic is proposed. The proposed converter consists of an auxiliary circuit,
an inductor, two switches, and 2 diodes to achieving high efficiency at full range of load. At low
and heavy loads, ZVS of switching device is achieved by energy storing component. The inductor
energy stored varies with load and hence results in minimizes conduction loss. This leads to
switching of device for full range of load. The proposed DC - DC converter achieves high
efficiency as switching loss is reduced due to soft switching and ZVS operation which severe to
reduce conduction loss. The efficiency is improved about 4% in boost mode (2.5% in buck mode) at
full range of load. To verify the performance of the proposed converter, experimental results
prototype are presented.
ER Publication,
IJETR, IJMCTR,
Journals,
International Journals,
High Impact Journals,
Monthly Journal,
Good quality Journals,
Research,
Research Papers,
Research Article,
Free Journals, Open access Journals,
erpublication.org,
Engineering Journal,
Science Journals,
Single-Input Double Output High Efficient Boost Dc–Dc ConverterIJMER
The aim of this project is to develop a high-efficiency single-input multiple-output (SIMO) dc–dc converter. The proposed converter can boost the voltage of a low-voltage input power source to a controllable high-voltage dc bus and middle-voltage output terminals. The high-voltage dc bus can take as the main power for a high-voltage dc load or the front terminal of a dc–ac inverter.Moreover, middle-voltage output terminals can supply powers for individual middle-voltage dc loads or for charging auxiliary power sources (e.g., battery modules). In this project, a coupled-inductor based dc–dc converter scheme utilizes only one power switch with the properties of voltage clamping and soft switching, and the corresponding device specifications are adequately designed. As a result, the objectives of high-efficiency power conversion, high step up ratio, and various output voltages with different levels can be obtained
An Efficient High Gain DC-DC Converter for Automotive ApplicationsIJPEDS-IAES
This paper presents a high gain DC-DC converter which uses a clamp circuit
to achieve soft switching. The proposed converter is designed to supply a
high intensity discharge (HID) lamp used in automobile head lamps. The
converter operates from a 12V input supply and provides an output voltage
of 120V at 35W output power. A clamp circuit consisting of a clamp
capacitor, clamp switch and resonant inductor will help to achieve zero
voltage switching (ZVS) of the both main and clamp switches. The practical
performance of the converter was validated through experimental results.
Results obtained from the prototype hardware prove that the converter meets
the requirements of HID lamp application and can be a very good alternative
to existing converters.
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
A High Step Up Hybrid Switch Converter Connected With PV Array For High Volt...ijitjournal
T
his paper
presents
a
ste
p up DC
-
to
-
DC converter with
hybrid switch capacitor technique having
high
voltage conversion ratio with small
switch voltage stress
. The converter is suitable for the applications
where high voltage conversion is required. The proposed
DC
-
DC converter
has low voltage ratted
MOSFET switch and is connected to PV array to get high output voltage at small duty ratios.
Hence it has
high efficiency.
The principles of operations and the theoretical analysis are presented in this paper.
All the
simulations are
done in MATLAB
-
SIMULINK Environment and
results were obtained with voltage
conversion ratio of 4.
Abstract: Energy from the sun and the wind can alleviate the pressure on traditional sources that has been considerably depleted. Many stages of renewable energy conversion require DC-DC converters with high voltage gain and high power. The applications where electrical isolation is not necessary, transformer less high gain converters can be used in order to avoid the difficulty of using large capacity transformers. This is a step up resonant converter which can achieve high voltage-gain using LC parallel resonant tank. Zero-voltage-switching (ZVS) of semiconductor devices in a resonant converter can be achieved by resonant devices. It is characterized by ZVS turn-on and nearly ZVS turn-off of main switches. Moreover, the equivalent voltage stress of the semiconductor devices is lower than other resonant step up converters. A resonant converter is simulated using MATLAB/SIMULINK and experimental results are also verified.
Keywords: Frequency Modulation, Resonant Converter, Zero Voltage Switching, Voltage Stress.
Title: Variable Switching Frequency Based Resonant Converter
Author: Anooja Shahul, Prof. Annie P Oommen, Prof. Sera Mathew
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications
Similar to A Soft-Switching DC/DC Converter with High Voltage Gain (20)
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
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A Soft-Switching DC/DC Converter with High Voltage Gain
1. IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 7, Issue 4 (Sep. - Oct. 2013), PP 33-42
www.iosrjournals.org
www.iosrjournals.org 33 | Page
A Soft-Switching DC/DC Converter with High Voltage Gain
Prakash Parvatham, Dr.A.Srujana:
Abstract: A soft-switching dc/dc converter with high voltage gain is proposed in this paper. The proposed
converter reduces switching loss of active power switches and raises the conversion efficiency by using zero
voltage switching (zvs) and zero current switching (zcs) techniques. This paper provides the effective solution
for reverse recovery problem of the output rectifier by controlling the rate of change of current through diodes
with the help of leakage inductance of a couple inductor cell. The proposed converter also provides continuous
input current and high voltage gain. Experimental results obtained on 200W prototype are discussed..
Index Terms: Boost converter, high voltage gain, soft switching.
I. Introduction
In the 1970‟s, conventional PWM power converters were operated in a switched mode operation.
Power switches have to cut off the load current within the turn-on and turn-off times under the hard switching
conditions. Hard switching refers to the stressful switching behavior of the power electronic devices. The
switching trajectory of a hard-switched power device is shown in Fig.i. During the turn-on and turn-off
processes, the power device has to withstand high voltage and current simultaneously, resulting in high
switching losses and stress. Dissipative passive snubbers are usually added to the power circuits so that the dv/dt
and di/dt of the power devices could be reduced, and the switching loss and stress be diverted to the passive
snubber circuits. However, the switching loss is proportional to the switching frequency, thus limiting the
maximum switching frequency of the power converters. Typical converter switching frequency was limited to a
few tens of kilo-Hertz (typically 20kHz to 50kHz) in early 1980‟s. The stray inductive and capacitive
components in the power circuits and power devices still cause considerable transient effects, which in turn give
rise to electromagnetic interference (EMI) problems. In late 1980‟s and throughout 1990‟s, further
improvements have been made in converter technology. New generations of soft-switched converters that
combine the advantages of conventional PWM converters and resonant converters have been developed. These
soft-switched converters have switching waveforms similar to those of conventional PWM converters except
that the rising and falling edges of the waveforms are „smoothed‟ with no transient spikes. Unlike the resonant
converters, new soft-switched converters usually utilize the resonance in a controlled manner. Soft-switching
converters also provide an effective solution to suppress EMI and have been applied to DC-DC, AC-DC and
DC-AC converters. Various forms of soft-switching techniques such as ZVS, ZCS, voltage clamping, zero
transition methods etc. are addressed. The emphasis is placed on the basic operating principle and practicality of
the converters without using much mathematical analysis.
I
VOff
On
Soft-switching
Hard-switching
Safe Operating Area
snubbered
Fig.i Typical switching trajectorie of power switches.
2. A Soft-Switching DC/DC Converter With High Voltage Gain
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Fig.1.Circuit diagram of the proposed dc/dc converter.
In applications that require a voltage step-up function and a continuous input current, a continuous-conduction-
mode (CCM) boost converter is often used due to its advantages such as continuous input current and simple
structure. However, it has a limited voltage gain due to its parasitic components. Moreover, the reverse-recovery
problem of the output diode degrades the system‟s performances. At the moment when the switch turns on, the
reverse-recovery phenomenon of the output diode of the boost converter is provoked. The switch is submitted to
a high current change rate and a high peak of reverse-recovery current. The parasitic inductance that exists in the
current loop causes a ringing of the parasitic voltage, and then, it increases the voltage stresses of the switch and
the output diode. These effects significantly contribute to increase switching losses and electromagnetic
interference. The reverse-recovery problem of the output diodes is another important factor in dc/dc converters
with high voltage gain]. In order to overcome these problems, various topologies have been introduced. In order
to extend the voltage gain, the boost converters with coupled inductors are proposed. Their voltage gains are
extended, but they lose a continuous input current characteristic and the efficiency is degraded due to hard
switchings of power switches. For a continuous input current, current-fed step-up converters are proposed i.
They provide high voltage gain and galvanic isolation. However, the additional snubbers are required to reduce
the voltage stresses of switches.
In order to increase the efficiency and power conversion density, a soft-switching technique is required
in dc/dc converters. A soft-switching dc/dc converter with high voltage gain, which is shown in Fig. 1, is
proposed. A CCM boost cell provides a continuous input current. To increase the voltage gain, the output of
the coupled inductor cell is laid on the top of the output of the CCM boost cell. Therefore, the high voltage gain
is obtained without high turn ratio of the coupled inductor, and the voltage stresses of the switches are confined
to the output voltage of the CCM boost cell.
A zero-voltage-switching (ZVS) operation of the power switches reduces the switching loss during the
switching transition and improves the overall efficiency. The theoretical analysis is verified by a 200 W
experimental prototype with 24-to-360 V conversion.
II. Analysis Of The Proposed Converter
Fig. 1 shows the circuit diagram of the proposed soft switching dc/dc converter with high voltage gain.
Its key waveforms are shown in Fig. 2. The switches S1 and S2 are operated asymmetrically and the duty ratio
D is based on the switch S1.
3. A Soft-Switching DC/DC Converter With High Voltage Gain
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Fig.2. Key waveforms of the proposed converter.
D1 and D2 are intrinsic body diodes of S1 and S2 . Capacitors C1 and C2 are the parasitic output capacitances
of S1 and S2 . The proposed converter contains a CCM boost cell. It consists of LB , S1 , S2, Co1 , and Co2 .
The CCM boost cell provides a continuous input current. When the switch S1 is turned on, the boost inductor
current iLB increases linearly from its minimum value ILB2 to its maximum value ILB1 . When the switch S1 is
turned off and the switch S2 is turned on, the current iLB decreases linearly from ILB1 to ILB2 . Therefore, the
output capacitor voltages Vo1 and Vo2 can be derived easily as
Vo1 = Vin (1)
Vo2 = D/( 1 – )D Vin . (2)
To obtain ZVS of S1 and S2 and high voltage gain, a coupled inductor Lc is inserted. The coupled inductor Lc is
modeled as the magnetizing inductance Lm, the leakage inductance Lk , and the ideal transformer that has a turn
ratio of 1:n (n = N2/N1 ). The voltage doubler consists of diodes D1 ,D2 and the output capacitors Co3, Co4 ,
and the secondary winding N2 of the coupled inductor Lc is on the top of the output stage of the boost cell to
increase voltage gain. The coupled inductor current iL varies from its minimum value −IL1 to its maximum
value IL2 . The operation of the proposed converter in one switching period Ts can be divided into six modes.
Fig. 3 shows the operating modes. Before t0 , the switch S2 and diode D4 are conducting.
Mode 1 [t0, t1 ]: At t0 , the switch S2 is turned off. Then, the boost inductor current iLB and the coupled
inductor current iL
start to charge C2 and discharge C1 . Therefore, the voltage vS1 across S1 starts to fall and the voltage vS2
across S2 starts to rise. Since the output capacitances C1 and C2 of the switches are very small, the transition
interval Tt1 is very short and it can be neglected. Therefore, the inductor currents iLB and iL can be considered
to have constant values during mode 1.
Mode 2 [t1, t2 ]: At t1 , the voltage vS1 across the lower switch S1 becomes zero and the lower diode D1 is
turned on. Then, the gate signal is applied to the switch S1 . Since the current has already flown through the
lower diode D1 and the voltage vS1 becomes zero before the switch S1 is turned on, zero-voltage turn-ON of S1
is achieved.
Since the voltage across the boost inductor LB is Vin , the boost inductor current increases linearly from ILB2 .
Mode 3 [t2, t3 ]: At t2 , the secondary current i2 changes its direction. The diode current iD4 decreases to zero
and the diode
4. A Soft-Switching DC/DC Converter With High Voltage Gain
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D4 is turned off. Then, diode D3 is turned on and its current increases linearly. Since the current changing rate
of D4 is controlled
by the leakage inductance of the coupled inductor, its reverse-recovery problem is alleviated. Since v1 is −Vin
and
vk is nVin − Vo4.
Mode 4 [t3, t4 ]: At t3 , the lower switch S1 is turned off. Then, the boost inductor current iLB and the coupled
inductor current iL start to charge C1 and discharge C2 . Therefore, the voltages vS1 and vS2 start to rise and
fall in a manner similar to that in mode 1.
Mode 5 [t4, t5 ]: At t4 , the voltage vS2 across the upper switch S2 becomes zero and the diode D2 is turned on.
Then, the gate signal is applied to the switch S2 . Since the current has already flown through the diode D2 and
the voltage vS2 becomes
zero before the switch S2 is turned on, zero-voltage turn-ON of S2 is achieved. Since the voltage across the
boost inductor LB is −(Vin/(1 − D) − Vin ), the boost inductor current decreases linearly from ILB1 . Since v1 is
DVin/(1 − D) and vk is −Vo3 − nDVin/(1 − D).
Mode 6 [t5, t6 ]: At t5 , the secondary current i2 changes its direction. The diode current iD3 decreases to zero
and the diode
D3 is turned off. The reverse-recovery
Fig. 3. Operating modes.
5. A Soft-Switching DC/DC Converter With High Voltage Gain
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problem of D3 is also alleviated due to the leakage inductance of Lc . Then, the diode
D4 is turned on and its current increases linearly. Since v1 is DVin/(1 − D) and vk is Vo4 − nDVin/(1 − D).
III. Characteristic And Design Parameters
A. Input Current Ripple
The input current ripple ΔILB can be written as
ΔILB = ILB1 − ILB2 = DVinTs/LB
. (3)
To reduce the input current ripple ΔILB below a specific value I∗, the inductor LB should satisfy the following
condition:
LB > DVinTs/I∗ (4)
B. Voltage Gain
the voltage gain of the proposed converter is obtained by
Vo/Vin=(1/1 – D)+ (nD (1 − α)/(D − α (2D − 1)) (1 − D + α (2D − 1))). (5)
Fig. 4 shows the voltage gain according to duty cycle D: (a) the voltage gain according toD under α=0.1 and
several n values;
6. A Soft-Switching DC/DC Converter With High Voltage Gain
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(b) the voltage gain according toD under n = 3 and several α values. As α increases, the voltage gain
decreases. Namely, larger Lk reduces the voltage gain. On the assumption that α is small, the voltage gain of
(34) can be simplified as follows:
Vo/Vin=(1 + n)/(1 – D ) (6)
C. ZVS Condition
The ZVS condition for S2 is given by Im2 + nID3 + ILB1 > 0 (7) Fig. 5. Normalized voltage stresses according
to duty cycle. (a) Under α = 0.1 and different n values. (b) Under n = 3 and different α values. from where, it can
be seen that the ZVS of S2 is easily obtained. For ZVS of S1 , the following condition should be satisfied:
Im1 + nID4 > ILB2 (7)
On the assumption that α is small, ID4 and ILB2 can be simplified as follows:
ID4 =2Io/1 – D (8)
ILB2 =(n + 1) Io/1 − D− ΔILB/2 . (9)
From (8) and (9), the inequality (7) can be rewritten by
Im1 + 2nIo/(1 – D)>(n + 1) Io/(1 – D)− ΔILB/2 . (10)
Since Im1, Io , and DILB are all positive values, the inequality (40) is always satisfied for n>1. From (7) and
(8), it can be seen that ZVS conditions for S1 and S2 are always satisfied. Moreover, dead times of two switches
S1 and S2 should be considered.
the gate signal should be applied to the switch before the current that flows through the anti parallel diode
changes its direction. Namely, the leakage inductance Lk should be large enough for the current to maintain its
direction during dead times of two switches, S1 and S2 . This condition can determine the minimum value of the
leakage inductance., the leakage inductance Lk should satisfy the following condition:
Lk > nVinDTs (1 –( 1 − 2Δ∗1/D)^2) /8I (11)
Where Δ∗ 1 is a predetermined minimum value ofΔ1 . The leakage inductance of the coupled inductor also
alleviates the reverse recovery problem of output diode. Large leakage inductance can remove the reverse-
recovery problem but it reduces the voltage gain as shown in Fig. 4(b).
Fig..4 Voltage gain according to duty cycle. (a) Under α = 0.1 and different values. (b) Under n = 3 and
different α values.
7. A Soft-Switching DC/DC Converter With High Voltage Gain
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.
Fig.5 Normalized voltage stresses according to duty cycle. (a) Under α = 0.1 and different n values. (b) Under n
= 3 and different α values.
D. Voltage Stress of Devices
Generally, high output voltage will impose high-voltage stress across the switching devices in dc/dc
converters. In the proposed dc/dc converter, the voltage stresses across the switching devices are smaller than
the output voltage. Maximum values of vS1 and vS2 are confined to the output of the CCM boost cell as
follows:
vS1,Max = vS2,Max = Vo1 + Vo2= Vin/(1 – D) ( 12)
The maximum voltage stresses vD3,Max and vD4,Max of the output diodes are given by
vD1,Max = vD2,Max = Vo3 + Vo4 = Vo−Vin/(1 – D) (13)
Fig. 5 shows the voltage stresses of the power switches and the output diodes that are normalized with Vo .
IV. Experimental Results:
The prototype soft-switching dc/dc converter with high voltage gain is implemented with specifications
of n = 5, Vin = 24 V, Vo = 360 V, LB = 154 μH, Lk = 74 μH, Co1 = Co2 = Co3 = Co4 = 47 μF, Lm = 105 μH, fs
= 100 kHz, and Po = 200 W. Fig. 6 shows PSPICE simulation results. Fig. 7 shows the experimental waveforms
of the prototype of the proposed converter. Fig. 7(a) shows the inductor currents iLB and iL , and the voltage
vS1. It can be seen that the experimental waveforms agree with the theoretical analysis and the simulation
results in Fig. 6. The input current is continuous.
8. A Soft-Switching DC/DC Converter With High Voltage Gain
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Fig. 6 Simulation results. (a) iLB1 , iL , iD3, iD4, and vS1 . (b) iS1 , vGS1 , vS1 , iS2 , vGS2, and vS2 .
Fig. 7 Experimental waveforms. (a) iLB1 , iL , and vS1. (b) iD3, iD4, and vS1 .
9. A Soft-Switching DC/DC Converter With High Voltage Gain
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Fig. 8. ZVS of S1 and S2 . (a) iS1 , vGS1, and vS1 . (b) iS2 , vGS2, and vS2 .
The ripple component of the input current can be controlled by LB. Fig. 7(b) shows the experimental results of
the turn-OFF current of diodes D3 and D4 . It is clear that the reverse-recovery current is significantly reduced
and the reverse-recovery problem is alleviated dramatically by the leakage inductance of the coupled inductor
Lc. Fig. 8. Shows the ZVS of S1 and S2 . (a) iS1 , vGS1, and vS1 . (b) iS2 , vGS2, and vS2 . Fig. 8 shows the
ZVS of S1 and S2. In Fig. 8(a), the voltage vS1 across the switch S1 reaches zero before the gate pulse vGS1 is
applied to S1 . Fig. 8(b) shows the ZVS of S2 . Fig. 9 shows the measured efficiency of the proposed converter.
It exhibits an efficiency of 96.4% at full-load condition. Due to its soft-switching characteristic and alleviated
reverse-recovery problem, the overall efficiency was improved by around 2%compared with the conventional
high step-up boost converter with a coupled inductor.
Fig. 9 Measured efficiency.
V. Conclusion
A soft-switching dc/dc converter with high voltage gain has been proposed in this paper. A simple and
effective method to alleviate rectifier reverse- recovery problems in CCM boost converters is proposed in this
paper the proposed converter can minimize the voltage stresses of the switching devices and lower the turn ratio
of the coupled inductor. It provides a continuous input current, and the ripple components of the input current
can be controlled by using the inductance of the CCM boost cell. Soft switching of power switches and the
alleviated reverse-recovery problem of the output rectifiers improve the overall efficiency.
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Prakash Parvatham : II-M.Tech at Sri Venkateshwara Engineering College ,Suryapet his
interested in Power Electronics and power systems.
Dr.A.Srujana:
B.Tech(Electrical),M.Tech(PE),ph.D(HVDC).: Working as Professor& Head of EEE at Sri
Venkateshwara Engineering College ,Suryapet her interested in Power Electronics and Power
Systems .