- The document presents the design of a SEPIC integrated Boost (SIB) converter using a coupled inductor. The proposed converter has advantages like lower voltage stress on switches, non-inverting output voltage, high efficiency, and high voltage gain.
- The proposed converter consists of two switches, three inductors (including a coupled inductor), two diodes, and three capacitors. It can be easily controlled in continuous conduction mode by giving the two switches the same gate pulses.
- Simulation results show that the proposed converter achieves a high output voltage gain and verifies its performance for both open-loop and closed-loop topologies.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
This paper presents the design and operation of three-stage buck-boost converter with high gain soft switching using closed loop proportional integral (PI) controller. The proposed converter is designed by arranging three identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays a vital role in soft switching operation of converter by maintaining the voltage applied to switches at zero voltage at switching intervals, i.e., the zero-voltage switching (ZVS). The closed-loop system is designed by PI controller, and it maintains the output constant irrespective of changes in input, and the system becomes stable. The proposed converter is efficient in reducing switching losses, leading to improved converter efficiency. Due to parallel operation of three identical converters, the output voltage and input current contain fewer ripples than those of a single converter with same specifications. Proposed converter is more economical and reliable with simpler structure as it utilizes only two inductors as extra elements. The design and analysis of proposed circuit has been carried out in MATLAB Simulink by operating the circuit in various modes.
A Novel High Gain SEPIC Converter with the Tapped Inductor Model Operating in...IJPEDS-IAES
Power factor correction (PFC) has become one of the most active research
areas in the field of power electronics due to the surplus power required for
various industrial applications around the world. In this work, a novel SEPIC
converter with the tapped inductor model operating in discontinuous
conduction mode (TI-SEPIC- DCM) is proposed for PFC. The proposed TISEPIC-
DCM improves the voltage gain through voltage multiplier cell and
charge pump circuit. The voltage multiplier cell also helps in attaining the
zero-voltage switching (ZVS) and zero-current switching (ZCS), which
results in higher switching frequency and size reduction. Moreover, a third
order harmonic reduction control loop has been proposed for better harmonic
mitigation. The proposed work has been simulated in MATLAB and the
results are obtained to validate the significance of the proposed TI-SEPICDCM
with near unity power factor and reduced harmonics.
Analysis of Variable MLI Based BLDC Motor Drive with PFC for Reduced Torque R...IJERA Editor
This paper presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed brushless direct
current (BLDC) motor drive as a cost-effective solution for low-power applications. An approach of speed
control of the BLDC motor by controlling the dc link voltage of the voltage source inverter (VSI) is used with a
single voltage sensor. This facilitates the operation of VSI at fundamental frequency switching by using the
electronic commutation of the BLDC motor which offers reduced switching losses. A BL configuration of the
buck–boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the
conduction losses associated with it. A PFC BL buck–boost converter is designed to operate in discontinuous
inductor current mode (DICM) to provide an inherent PFC at ac mains. The performance of the proposed drive
is evaluated over a wide range of speed control and varying supply voltages (universal ac mains at 90–265 V)
with improved power quality at ac mains. The obtained power quality indices are within the acceptable limits of
international power quality standards such as the IEC 61000-3-2. The performance of the proposed drive is
simulated in MATLAB/Simulink environment, and the obtained results are validated experimentally on a
developed prototype of the drive.
Transformer less Boost Converter Topologies with Improved Voltage Gain Operat...IJMER
In this project, a new step up converter proposed in a recent work is analyzed, designed, simulated with MATLAB Simulink. Conventional dc–dc boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. This paper proposes transformer less dc–dc converters to achieve high step-up voltage gain without an extremely high duty ratio. In the proposed converters, two inductors with the same level of inductance are charged in parallel during the switch-on period and are discharged in series during the switch-off period. The structures of the proposed converters are very simple.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
This paper presents the design and operation of three-stage buck-boost converter with high gain soft switching using closed loop proportional integral (PI) controller. The proposed converter is designed by arranging three identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays a vital role in soft switching operation of converter by maintaining the voltage applied to switches at zero voltage at switching intervals, i.e., the zero-voltage switching (ZVS). The closed-loop system is designed by PI controller, and it maintains the output constant irrespective of changes in input, and the system becomes stable. The proposed converter is efficient in reducing switching losses, leading to improved converter efficiency. Due to parallel operation of three identical converters, the output voltage and input current contain fewer ripples than those of a single converter with same specifications. Proposed converter is more economical and reliable with simpler structure as it utilizes only two inductors as extra elements. The design and analysis of proposed circuit has been carried out in MATLAB Simulink by operating the circuit in various modes.
A Novel High Gain SEPIC Converter with the Tapped Inductor Model Operating in...IJPEDS-IAES
Power factor correction (PFC) has become one of the most active research
areas in the field of power electronics due to the surplus power required for
various industrial applications around the world. In this work, a novel SEPIC
converter with the tapped inductor model operating in discontinuous
conduction mode (TI-SEPIC- DCM) is proposed for PFC. The proposed TISEPIC-
DCM improves the voltage gain through voltage multiplier cell and
charge pump circuit. The voltage multiplier cell also helps in attaining the
zero-voltage switching (ZVS) and zero-current switching (ZCS), which
results in higher switching frequency and size reduction. Moreover, a third
order harmonic reduction control loop has been proposed for better harmonic
mitigation. The proposed work has been simulated in MATLAB and the
results are obtained to validate the significance of the proposed TI-SEPICDCM
with near unity power factor and reduced harmonics.
Analysis of Variable MLI Based BLDC Motor Drive with PFC for Reduced Torque R...IJERA Editor
This paper presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed brushless direct
current (BLDC) motor drive as a cost-effective solution for low-power applications. An approach of speed
control of the BLDC motor by controlling the dc link voltage of the voltage source inverter (VSI) is used with a
single voltage sensor. This facilitates the operation of VSI at fundamental frequency switching by using the
electronic commutation of the BLDC motor which offers reduced switching losses. A BL configuration of the
buck–boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the
conduction losses associated with it. A PFC BL buck–boost converter is designed to operate in discontinuous
inductor current mode (DICM) to provide an inherent PFC at ac mains. The performance of the proposed drive
is evaluated over a wide range of speed control and varying supply voltages (universal ac mains at 90–265 V)
with improved power quality at ac mains. The obtained power quality indices are within the acceptable limits of
international power quality standards such as the IEC 61000-3-2. The performance of the proposed drive is
simulated in MATLAB/Simulink environment, and the obtained results are validated experimentally on a
developed prototype of the drive.
Transformer less Boost Converter Topologies with Improved Voltage Gain Operat...IJMER
In this project, a new step up converter proposed in a recent work is analyzed, designed, simulated with MATLAB Simulink. Conventional dc–dc boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. This paper proposes transformer less dc–dc converters to achieve high step-up voltage gain without an extremely high duty ratio. In the proposed converters, two inductors with the same level of inductance are charged in parallel during the switch-on period and are discharged in series during the switch-off period. The structures of the proposed converters are very simple.
Comparison of Buck-Boost and Cuk Converters for BLDC Drive Applications with PFCIJMTST Journal
The devices generally used in industrial, commercial and residential applications need to undergo rectification for their proper functioning and operation. Hence there is a need to reduce the line current harmonics so as to improve the power factor of the system. This has led to designing of Power Factor Correction circuits. This project presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed brushless direct current (BLDC) motor drive as a cost-effective solution for low-power applications. The conventional PFC scheme of the BLDC motor drive utilizes a pulse width-modulated voltage source inverter (PWM-VSI) for speed control with a constant dc link voltage. This offers higher switching losses in VSI as the switching losses increase as a square function of switching frequency. A BL configuration of the buck–boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the conduction losses associated with it. A PFC BL buck–boost converter is designed to operate in discontinuous inductor current mode (DICM) to provide an inherent PFC at ac mains. The simulation results are presented by using Matlab/Simulink software. The proposed concept can be extended with cuk converter for BLDC drive applications using Matlab/Simulink software
This paper proposes a non-isolated soft-switching bidirectional dc/dc converter for interfacing energy storage in DC microgrid. The proposed converter employs a half-bridge boost converter at input port followed by a LCC resonant tank to assist in soft-switching of switches and diodes, and finally a voltage doubler circuit at the output port to enhance the voltage gain by two times. The LCC resonant circuit also adds a suitable voltage gain to the converter. Therefore, overall high voltage gain of the converter is obtained without a transformer or large number of multiplier circuit. For operation in buck mode, the high side voltage is divided by half with capacitive divider to gain higher step-down ratio. The converter is operated at high frequency to obtain low output voltage ripple, reduced magnetics and filters. Zero voltage turn-on is achieved for all switches and zero current turn-on and turn-off is achieved for all diodes in both modes i.e., buck/boost operation. Voltage stress across switches and diode is clamped naturally without external snubber circuit. An experimental prototype has been designed, built and tested in the laboratory to verify the performance of the proposed converter.
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.
Transformerless Buck-Boost Converter With Positive Output Voltage and Nominal...paperpublications3
Abstract: This article deals with a transformerless buck-boost converter with simple structure. By inserting an additional switched network into the traditional buck-boost converter new converter is obtained. Compared with the traditional buck-boost converter, its voltage gain is quadratic of the traditional buck-boost converter. It can operate in a wide range of output voltage, that is, the proposed buck-boost converter can achieve high or low voltage gain without extreme duty cycle. Moreover, the output voltage of this transformerless buck-boost converter is common-ground with the input voltage, and its polarity is positive. The two power switches of the proposed buck-boost converter operate synchronously. The operating principles and the steady-state analyses for the buck-boost converter operating in CCM are presented. The PSIM simulations are provided to compare and validate the effectiveness of the buck-boost converter.
Keywords: Buck-Boost, Transformerless, Positive Output Voltage, Quadratic Gain.
Title: Transformerless Buck-Boost Converter With Positive Output Voltage and Nominal Duty Ratio
Author: Aleena Paul K, Prof.Sini Paul, Prof.Geethu James
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications
Fuzzy based control of Transformer less Coupled inductor based DC-DC converterIJERA Editor
Most of the industrial applications use any one of the basic DC-DC converter configurations namely buck,
boost, buck–boost, and Cuk converters. These converters are non-isolating converters. Buck-boost converters
use inductors for storing energy from the source and release the same to load or output. This results in high
stress across magnetic components. This drawback restricts usage of buck-boost converters to low power
applications. Flyback converters popularly have known as buck-boost converters uses transformers for
achieving wide range of step down and step up voltages. Coupled inductor based converters or tapped inductor
based converters are used for achieving wide input – wide output conversion ratios. Coherent transition between
step-down and step-up modes is achieved by a proper control scheme. This paper proposes fuzzy logic based
closed loop control scheme for control of converter switches. Theoretical derivations of control parameters with
their membership values, mamdani based rules for development of fuzzy rules and simulation results of a
coupled inductor based DC-DC converter using MATLAB / SIMULINK are concluded.
Design of Half Bridge LLC Resonant Converter for Low Voltage Dc ApplicationsIOSRJEEE
An advanced hybrid LLC series resonant converter with united flying-capacitor cell is proposed in this paper to permit the high step-down conversion in the high input voltage applications. The in-built flyingcapacitor branch in the primary side can efficiently share out the primary switch voltage stress related with the half-bridge LLC converters. And the input voltage can be shared correspondingly and automatically between the two series half-bridge components lacking additional balance circuit or control strategies owing to the built-in flying- capacitor cell. Likewise, the inherent soft switching performance in extensive load range that exists in the LLC converters is still kept to decrease the switching losses, which ensures the high efficiency. In addition, the proposed converter can be comprehensive to reduce the switch voltage stress byemploying stacked connection. Finally, a 500∼640 Vinput 48 Voutput 1 kW prototype is built and tested to verify the efficiency of the proposed converter. The results prove that the proposed converter is an excellent candidate for the high input voltage and high step-down dc/dc conversion systems.
Adaptive Variable Speed Control Scheme for Wind Based on PFC of BLDC Drive Ap...IJMTST Journal
The wind turbine acts as a prime-mover for doubly fed BLDC generator. To make the system stable, proper
monitoring is required or sometimes an auxiliary system can also be a good option, which can support the
primary system during undesirable conditions. The simulation results show a significant enhancement in
shortening development time and improving dynamic performance of the BLDC motor compared to the
conventional speed control of BLDC motor drive. The wind turbine acts as a prime-mover for doubly fed BLDC
generator. The three phase BLDC motor has wide applications in industries due to its rugged construction,
efficiency and low cost. Neutral point clamped is used for estimation of feedback controller parameters for
three phase BLDC motor fed from wind turbine .Neutral point clamped offers certain advantages such as
simple steps. The PFC BL-Luo converter has been designed to operate in DICM and to act as an inherent
power factor pre-regulator. An electronic commutation of the BLDC motor has been used which utilizes a
low-frequency operation of VSI for reduced switching losses. The simulation results show a significant
enhancement in variable industrial applications and improving dynamic performance of the BLDC motor
compared to the conventional speed control of BLDC motor drive. The proposed concept can be implemented
to adaptive variable speed control scheme for wind energy based BLDC motor using Matlab/Simulink
software
An Asymmetrical Dc-Dc Converter with a High Voltage GainIJMER
An asymmetrical full bridge converter is proposed in the paper. The proposed converter
achieves zero voltage switching of all the power switches. Zero current switching of all the output diodes
are also achieved here. This in turn provides a highly efficienct operation. The proposed converter can
provide a high voltage gain and the voltages across the semi- conductor devices are effectively clamped.
The converter can be utilised effectively in high voltage applications as embedded systems, renewable
energy systems, fuel cells, mobility applications and uninterrupted power supply
Extremely high duty cycle of boost converter may result in higher conduction losses. To achieve a high
conversion ratio without operating at extremely high duty ratio, some converters based on transformers or coupled
inductors or tapped inductors have been provided. However, the leakage inductance in the transformer, coupled
inductor or tapped inductor will cause high voltage spikes in the switches and reduce system efficiency. A novel
single switch cascaded dc-dc converter of boost and buck boost converters have extended voltage conversion ratio
to d/(1-d)2. The features of the converter are high voltage gain; only one switch for realizing the converter, the
number of magnetic components is small etc. So comparing with other topologies cascaded converter is more
effective. Simulation of the converter for a dc input voltage and fixed duty cycle was done, and the same was
verified experimentally for a low input voltage. The software used for simulation was MatlabR2014a
Design of integrated multistage dc dc convrtereSAT Journals
Abstract Due to the functionality increase of modern battery powered portable devices, the battery life is an important issue. To extend the battery life, an efficient voltage regulator (VR) is required. In this paper discusses the employment of two-stage architecture on the design of point-of-load (POL) Dc- Dc converters. At first, the paper discusses the benefits of an integrated two-stage step-down converter with example to clarify the benefits of the design over one-stage approach. The results of two-stage converter are to be compared with the one-stage approach in addition to size and cost reduction. Then, the benefits of replacing boost converters by integrated two-stage step-up converters are discussed followed by a design example for two-stage step-up converter. The circuits are to be simulated and compared with the help of MATLAB/SIMULINK. Keywords: voltage regulator (VR), point-of-load (POL), MATLAB/SIMULINK
Implementation of TI-SEPIC Converter for Optimal Utilization Of PV Powerijtsrd
In this project qualitative analysis and controller design of a TI-SEPIC converter for optimal utilization photovoltaic power is presented. This converter is essentially combination of conventional buck and SEPIC converters sharing common components. On the account of the integration load side only one inductor is sufficient enough for performing the power conversion in both Buck and SEPIC converters. Here the function of the lower SEPIC converter is to extract maximum power from the PV and feeds into the load, while the remaining load power demand is supplied by the dc source through a voltage-mode controlled buck converter. Proposed integrated Converter performance is verified through MAT/SIM software simulations and then verified with measurement results obtained the laboratory prototype converter system. A.S.Valarmathy"Implementation of TI-SEPIC Converter for Optimal Utilization Of PV Power" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-5 , August 2017, URL: http://www.ijtsrd.com/papers/ijtsrd2393.pdf http://www.ijtsrd.com/engineering/electrical-engineering/2393/implementation-of-ti-sepic-converter-for-optimal-utilization-of-pv-power/asvalarmathy
Design of an Integrated Power Factor Converter with PI Controller for Low Pow...IOSRJEEE
In this paper, an integrated power factor converter with PI controller is proposed. The circuit topology is obtained by integrating two converters namely the buck converter and a boost converter. The boost converter is normally a step up converter which obtain an unity power factor and performs low harmonics at the input. Based on the simple circuit topology and easy control the boost converter or buck-boost converter is used as power factor correctors. Similarly the buck converter regulates the dc-link voltage and provide a stable dc output voltage. To achieve unity power factor, the output voltage of both converter should be higher than the amplitude of the ac line voltage. The steady -state analysis is developed and a design is provided
Comparison of Buck-Boost and Cuk Converters for BLDC Drive Applications with PFCIJMTST Journal
The devices generally used in industrial, commercial and residential applications need to undergo rectification for their proper functioning and operation. Hence there is a need to reduce the line current harmonics so as to improve the power factor of the system. This has led to designing of Power Factor Correction circuits. This project presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed brushless direct current (BLDC) motor drive as a cost-effective solution for low-power applications. The conventional PFC scheme of the BLDC motor drive utilizes a pulse width-modulated voltage source inverter (PWM-VSI) for speed control with a constant dc link voltage. This offers higher switching losses in VSI as the switching losses increase as a square function of switching frequency. A BL configuration of the buck–boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the conduction losses associated with it. A PFC BL buck–boost converter is designed to operate in discontinuous inductor current mode (DICM) to provide an inherent PFC at ac mains. The simulation results are presented by using Matlab/Simulink software. The proposed concept can be extended with cuk converter for BLDC drive applications using Matlab/Simulink software
This paper proposes a non-isolated soft-switching bidirectional dc/dc converter for interfacing energy storage in DC microgrid. The proposed converter employs a half-bridge boost converter at input port followed by a LCC resonant tank to assist in soft-switching of switches and diodes, and finally a voltage doubler circuit at the output port to enhance the voltage gain by two times. The LCC resonant circuit also adds a suitable voltage gain to the converter. Therefore, overall high voltage gain of the converter is obtained without a transformer or large number of multiplier circuit. For operation in buck mode, the high side voltage is divided by half with capacitive divider to gain higher step-down ratio. The converter is operated at high frequency to obtain low output voltage ripple, reduced magnetics and filters. Zero voltage turn-on is achieved for all switches and zero current turn-on and turn-off is achieved for all diodes in both modes i.e., buck/boost operation. Voltage stress across switches and diode is clamped naturally without external snubber circuit. An experimental prototype has been designed, built and tested in the laboratory to verify the performance of the proposed converter.
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.
Transformerless Buck-Boost Converter With Positive Output Voltage and Nominal...paperpublications3
Abstract: This article deals with a transformerless buck-boost converter with simple structure. By inserting an additional switched network into the traditional buck-boost converter new converter is obtained. Compared with the traditional buck-boost converter, its voltage gain is quadratic of the traditional buck-boost converter. It can operate in a wide range of output voltage, that is, the proposed buck-boost converter can achieve high or low voltage gain without extreme duty cycle. Moreover, the output voltage of this transformerless buck-boost converter is common-ground with the input voltage, and its polarity is positive. The two power switches of the proposed buck-boost converter operate synchronously. The operating principles and the steady-state analyses for the buck-boost converter operating in CCM are presented. The PSIM simulations are provided to compare and validate the effectiveness of the buck-boost converter.
Keywords: Buck-Boost, Transformerless, Positive Output Voltage, Quadratic Gain.
Title: Transformerless Buck-Boost Converter With Positive Output Voltage and Nominal Duty Ratio
Author: Aleena Paul K, Prof.Sini Paul, Prof.Geethu James
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications
Fuzzy based control of Transformer less Coupled inductor based DC-DC converterIJERA Editor
Most of the industrial applications use any one of the basic DC-DC converter configurations namely buck,
boost, buck–boost, and Cuk converters. These converters are non-isolating converters. Buck-boost converters
use inductors for storing energy from the source and release the same to load or output. This results in high
stress across magnetic components. This drawback restricts usage of buck-boost converters to low power
applications. Flyback converters popularly have known as buck-boost converters uses transformers for
achieving wide range of step down and step up voltages. Coupled inductor based converters or tapped inductor
based converters are used for achieving wide input – wide output conversion ratios. Coherent transition between
step-down and step-up modes is achieved by a proper control scheme. This paper proposes fuzzy logic based
closed loop control scheme for control of converter switches. Theoretical derivations of control parameters with
their membership values, mamdani based rules for development of fuzzy rules and simulation results of a
coupled inductor based DC-DC converter using MATLAB / SIMULINK are concluded.
Design of Half Bridge LLC Resonant Converter for Low Voltage Dc ApplicationsIOSRJEEE
An advanced hybrid LLC series resonant converter with united flying-capacitor cell is proposed in this paper to permit the high step-down conversion in the high input voltage applications. The in-built flyingcapacitor branch in the primary side can efficiently share out the primary switch voltage stress related with the half-bridge LLC converters. And the input voltage can be shared correspondingly and automatically between the two series half-bridge components lacking additional balance circuit or control strategies owing to the built-in flying- capacitor cell. Likewise, the inherent soft switching performance in extensive load range that exists in the LLC converters is still kept to decrease the switching losses, which ensures the high efficiency. In addition, the proposed converter can be comprehensive to reduce the switch voltage stress byemploying stacked connection. Finally, a 500∼640 Vinput 48 Voutput 1 kW prototype is built and tested to verify the efficiency of the proposed converter. The results prove that the proposed converter is an excellent candidate for the high input voltage and high step-down dc/dc conversion systems.
Adaptive Variable Speed Control Scheme for Wind Based on PFC of BLDC Drive Ap...IJMTST Journal
The wind turbine acts as a prime-mover for doubly fed BLDC generator. To make the system stable, proper
monitoring is required or sometimes an auxiliary system can also be a good option, which can support the
primary system during undesirable conditions. The simulation results show a significant enhancement in
shortening development time and improving dynamic performance of the BLDC motor compared to the
conventional speed control of BLDC motor drive. The wind turbine acts as a prime-mover for doubly fed BLDC
generator. The three phase BLDC motor has wide applications in industries due to its rugged construction,
efficiency and low cost. Neutral point clamped is used for estimation of feedback controller parameters for
three phase BLDC motor fed from wind turbine .Neutral point clamped offers certain advantages such as
simple steps. The PFC BL-Luo converter has been designed to operate in DICM and to act as an inherent
power factor pre-regulator. An electronic commutation of the BLDC motor has been used which utilizes a
low-frequency operation of VSI for reduced switching losses. The simulation results show a significant
enhancement in variable industrial applications and improving dynamic performance of the BLDC motor
compared to the conventional speed control of BLDC motor drive. The proposed concept can be implemented
to adaptive variable speed control scheme for wind energy based BLDC motor using Matlab/Simulink
software
An Asymmetrical Dc-Dc Converter with a High Voltage GainIJMER
An asymmetrical full bridge converter is proposed in the paper. The proposed converter
achieves zero voltage switching of all the power switches. Zero current switching of all the output diodes
are also achieved here. This in turn provides a highly efficienct operation. The proposed converter can
provide a high voltage gain and the voltages across the semi- conductor devices are effectively clamped.
The converter can be utilised effectively in high voltage applications as embedded systems, renewable
energy systems, fuel cells, mobility applications and uninterrupted power supply
Extremely high duty cycle of boost converter may result in higher conduction losses. To achieve a high
conversion ratio without operating at extremely high duty ratio, some converters based on transformers or coupled
inductors or tapped inductors have been provided. However, the leakage inductance in the transformer, coupled
inductor or tapped inductor will cause high voltage spikes in the switches and reduce system efficiency. A novel
single switch cascaded dc-dc converter of boost and buck boost converters have extended voltage conversion ratio
to d/(1-d)2. The features of the converter are high voltage gain; only one switch for realizing the converter, the
number of magnetic components is small etc. So comparing with other topologies cascaded converter is more
effective. Simulation of the converter for a dc input voltage and fixed duty cycle was done, and the same was
verified experimentally for a low input voltage. The software used for simulation was MatlabR2014a
Design of integrated multistage dc dc convrtereSAT Journals
Abstract Due to the functionality increase of modern battery powered portable devices, the battery life is an important issue. To extend the battery life, an efficient voltage regulator (VR) is required. In this paper discusses the employment of two-stage architecture on the design of point-of-load (POL) Dc- Dc converters. At first, the paper discusses the benefits of an integrated two-stage step-down converter with example to clarify the benefits of the design over one-stage approach. The results of two-stage converter are to be compared with the one-stage approach in addition to size and cost reduction. Then, the benefits of replacing boost converters by integrated two-stage step-up converters are discussed followed by a design example for two-stage step-up converter. The circuits are to be simulated and compared with the help of MATLAB/SIMULINK. Keywords: voltage regulator (VR), point-of-load (POL), MATLAB/SIMULINK
Implementation of TI-SEPIC Converter for Optimal Utilization Of PV Powerijtsrd
In this project qualitative analysis and controller design of a TI-SEPIC converter for optimal utilization photovoltaic power is presented. This converter is essentially combination of conventional buck and SEPIC converters sharing common components. On the account of the integration load side only one inductor is sufficient enough for performing the power conversion in both Buck and SEPIC converters. Here the function of the lower SEPIC converter is to extract maximum power from the PV and feeds into the load, while the remaining load power demand is supplied by the dc source through a voltage-mode controlled buck converter. Proposed integrated Converter performance is verified through MAT/SIM software simulations and then verified with measurement results obtained the laboratory prototype converter system. A.S.Valarmathy"Implementation of TI-SEPIC Converter for Optimal Utilization Of PV Power" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-5 , August 2017, URL: http://www.ijtsrd.com/papers/ijtsrd2393.pdf http://www.ijtsrd.com/engineering/electrical-engineering/2393/implementation-of-ti-sepic-converter-for-optimal-utilization-of-pv-power/asvalarmathy
Design of an Integrated Power Factor Converter with PI Controller for Low Pow...IOSRJEEE
In this paper, an integrated power factor converter with PI controller is proposed. The circuit topology is obtained by integrating two converters namely the buck converter and a boost converter. The boost converter is normally a step up converter which obtain an unity power factor and performs low harmonics at the input. Based on the simple circuit topology and easy control the boost converter or buck-boost converter is used as power factor correctors. Similarly the buck converter regulates the dc-link voltage and provide a stable dc output voltage. To achieve unity power factor, the output voltage of both converter should be higher than the amplitude of the ac line voltage. The steady -state analysis is developed and a design is provided
A Novel High Step-Up DC–DC Converter for Hybrid Renewable Energy System appli...IJERD Editor
Large electric drives and utility applications require advanced power electronics converter to meet
the high power demands. As a result, power converter structure has been introduced as an alternative in high
power and medium voltage situations using Renewable energy sources (RES). This paper describes a new
DC/DC converter with safety, high efficiency and high step up capabilities. This converter is best suited for
Wind/Fuel cell(FC)based Induction Motor applications for pumping systems. The safety feature of this
converter makes it friendly for the farmers to use it for irrigation and agriculture usages. The converter achieves
high step-up voltage gain with appropriate duty ratio and low voltage stress on the power switches. Also, the
energy stored in the leakage inductor of the coupled inductor can be recycled to the output. The maximum
output voltage is determined by the number of the capacitors. The capacitors are charged in parallel and are
discharged in series by the coupled inductor, stacking on the output capacitor. Thus, the proposed converter can
achieve high step-up voltage gain with appropriate duty ratio and interfaced to induction motor through 9-level
inverter and also energy fed to grid system when no load operation. The simulation results are obtained using
MATLAB/SIMULINK software.
PV Cell Fed High Step-up DC-DC Converter for PMSM Drive ApplicationsIJMTST Journal
In this concept novel high step-up dc–dc converter with an active coupled-inductor network is presented for
a sustainable energy system. The proposed converter contains two coupled inductors which can be
integrated into one magnetic core and two switches. The primary sides of coupled inductors are charged in
parallel by the input source, and both the coupled inductors are discharged in series with the input source to
achieve the high step-up voltage gain with appropriate duty ratio, respectively. In addition, the passive
lossless clamped circuit not only recycles leakage energies of the coupled inductor to improve efficiency but
also alleviates large voltage spike to limit the voltage stresses of the main switches. The reverse-recovery
problem of the output diode is also alleviated by the leakage inductor and the lower part count is needed;
therefore, the power conversion efficiency can be further upgraded. The voltage conversion ratios, the effect of
the leakage inductance and the parasitic parameters on the voltage gain are discussed. The voltage stress
and current stress on the power devices are illustrated and the comparisons between the proposed converter
and other converters are given. The simulation results are presented by using Mat lab/Simulink software.
A Review on Modeling and Analysis of Multi Stage with Multi Phase DC DC Boost...YogeshIJTSRD
A new version of the new Hybrid Boost DC DC ready to draw power from two different DC sources for standard DC bus feeds is presented in this paper. An important feature of the proposed converter is that both sources provide simultaneous power to a lower load than the reduced current rate. This feature is very attractive for DC grid applications. With the analysis of the time zone, steady state performance is established and the transformational power correction parameters are obtained. In this paper, a powerful converter is introduced, with its operating principles based on charging pumps and converters of reinforcement series. In addition, although three switches are used, no separate gate driver is required instead of one bridge gate driver and one gate driver on the lower side. As such, the proposed converter is easy to analyze and easy to operate. In addition, additional test results are provided to confirm the effectiveness of the proposed converter. Mukesh Kuma | Manoj Kumar Dewangan | Maheedhar Dubey "A Review on Modeling and Analysis of Multi Stage with Multi Phase DC-DC Boost Converter" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-3 , April 2021, URL: https://www.ijtsrd.com/papers/ijtsrd39985.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/39985/a-review-on-modeling-and-analysis-of-multi-stage-with-multi-phase-dcdc-boost-converter/mukesh-kuma
Power electronic interface has reached a new level in the area of hybrid energy integration nowadays. The existence for the concept of hybrid energy integration is truly questionable without a proper power electronic interface. In this paper, a modified dual input DC-DC converter which is capable of incorporating two distinct V-I characteristic sources such as solar-PV, battery, fuel cell, etc., is proposed. The converter has the ability to operate in both unidirectional and bidirectional mode with buck, buck-boost and boost operation. The software simulation of the proposed converter has been conducted in MATLAB/Simulink platform in a detailed manner and an experimental prototype of the propsed converter has been built to validate the simulation results.
A DC-DC Converter with Ripple Current Cancellation Based On Duty Cycle SelectionIJMER
In this paper a boost dc-dc converter is proposed based on the concept of ripple current cancellation. This proposed system has the novel capability of cancelling the input current ripple at an arbitrarily preselected duty cycle. This is accomplished without increasing the count of the number of components in contrast to other solutions available in the conventional system. In addition to this, the converter also features a high voltage gain without utilizing extreme values of duty cycle or boosting transformers. These features make the converter ideal to process electric power coming from low-voltage power-generating sources, such as renewables. This system also provides details on the principle of operation via topological considerations and a mathematical model. The key factor of reactive component sizing is also discussed in detail. The proposed boost dc-dc converter is evaluated by simulating in MATLAB/Simulink software.
High Efficiency Dc-Dc Converter for Renewable Energy Applications and High Vo...IOSRJEEE
Renewable sources like solar PV cell is prefer to be operated at low voltages. This paper proposes a novel high voltage gain, high efficiency dc-dc converter based on coupled inductor, intermediate capacitor. The input energy acquired from the source is first stored in the coupled inductor and intermediate capacitor in a lossless manner. Improve the voltage gain and efficiency of the system. Exorbitant duty cycle values are not required for high voltage gain, when prevent the problems such as diode reverse recovery. Presence of a passive clamp network causes reduced voltage stress on the switch. Overall performance of the renewable energy with a step-up DC/DC converter using closed loop control action is used in the proposed system, improving the overall efficiency of the system.
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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.
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CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.