The Experts below are selected from a list of 1971 Experts worldwide ranked by ideXlab platform
Esam H Ismail - One of the best experts on this subject based on the ideXlab platform.
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a high voltage ratio and low stress dc dc converter with reduced input current ripple for fuel cell source
Renewable Energy, 2015Co-Authors: Mustafa A Alsaffar, Esam H IsmailAbstract:A new single-Switch non-isolated dc–dc converter with high-voltage gain and reduced semiconductor voltage stress is proposed in this paper. The proposed topology is derived from the conventional boost converter integrated with self-lift Sepic converter for providing high voltage gain without extreme Switch Duty-Cycle. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Moreover, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. Furthermore, the “near-zero” ripple current can be achieved at the input side of the converter which will help improve the fuel cell stack life Cycle. The principle of operation, and theoretical are performed. Experimental results of a 100 W/240 Vdc output with 24 Vdc input voltage are provided to evaluate the performance of the proposed scheme.
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high voltage step up integrated double boost sepic dc dc converter for fuel cell and photovoltaic applications
Renewable Energy, 2015Co-Authors: Ahmad J Sabzali, Esam H Ismail, Hussain M BehbehaniAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100-W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
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High voltage step-up integrated double Boost–Sepic DC–DC converter for fuel-cell and photovoltaic applications
Renewable Energy, 2015Co-Authors: Ahmad J Sabzali, Esam H Ismail, Hussain M BehbehaniAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100-W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
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Integrated Double Boost–SEPIC DC–DC Converter for Renewable Energy Systems
ICREGA’14 - Renewable Energy: Generation and Applications, 2014Co-Authors: Ahmad J Sabzali, Esam H IsmailAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100 W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
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ultra step up dc dc converter with reduced Switch stress
IEEE Transactions on Industry Applications, 2010Co-Authors: Abbas A. Fardoun, Esam H IsmailAbstract:In this paper, a new single-Switch nonisolated dc-dc converter with high voltage transfer gain and reduced semiconductor voltage stress is proposed. The proposed topology utilizes a hybrid Switched-capacitor technique for providing a high voltage gain without an extreme Switch Duty Cycle and yet enabling the use of a lower voltage and RDS-ON MOSFET Switch so as to reduce cost, Switch conduction, and turn-on losses. In addition, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching, and conduction losses. The principle of operation and a comparison with other high step-up topologies are presented. Two extensions of the proposed converter are also introduced and discussed. Simulation and experimental results are also presented to demonstrate the effectiveness of the proposed scheme.
Ahmad J Sabzali - One of the best experts on this subject based on the ideXlab platform.
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high voltage step up integrated double boost sepic dc dc converter for fuel cell and photovoltaic applications
Renewable Energy, 2015Co-Authors: Ahmad J Sabzali, Esam H Ismail, Hussain M BehbehaniAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100-W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
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High voltage step-up integrated double Boost–Sepic DC–DC converter for fuel-cell and photovoltaic applications
Renewable Energy, 2015Co-Authors: Ahmad J Sabzali, Esam H Ismail, Hussain M BehbehaniAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100-W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
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Integrated Double Boost–SEPIC DC–DC Converter for Renewable Energy Systems
ICREGA’14 - Renewable Energy: Generation and Applications, 2014Co-Authors: Ahmad J Sabzali, Esam H IsmailAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100 W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
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high conversion ratio dc dc converters with reduced Switch stress
IEEE Transactions on Circuits and Systems, 2008Co-Authors: Esam H Ismail, Mustafa A Alsaffar, Ahmad J SabzaliAbstract:In this paper, a new class of single-Switch nonisolated high step-up DC-DC converters with simple topologies is proposed. The proposed topologies utilize a hybrid Switched capacitor technique for providing a high voltage gain without extreme Switch Duty Cycle and yet enabling the use of a lower voltage and RDS-ON MOSFET Switch so as to reduce cost, Switch conduction and turn-on losses. Other advantages of the proposed topologies include: continuous input/output current, simple structure and control. The principle of operation in continuous conduction mode and discontinuous inductor current mode are analyzed. Experimental results obtained on a 45-W prototype are also presented.
Rou-yong Duan - One of the best experts on this subject based on the ideXlab platform.
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high efficiency dc dc converter with high voltage gain and reduced Switch stress
IEEE Transactions on Industrial Electronics, 2007Co-Authors: Rong-jong Wai, Rou-yong Duan, Chung-you Lin, Yungruei ChangAbstract:In this paper, a high-efficiency dc-dc converter with high voltage gain and reduced Switch stress is proposed. Generally speaking, the utilization of a coupled inductor is useful for raising the step-up ratio of the conventional boost converter. However, the Switch surge voltage may be caused by the leakage inductor so that it will result in the requirement of high-voltage-rated devices. In the proposed topology, a three-winding coupled inductor is used for providing a high voltage gain without extreme Switch Duty-Cycle and enhancing the utility rate of magnetic core. Moreover, the energy in the leakage inductor is released directly to the output terminal for avoiding the phenomenon of circulating current and the production of Switch surge voltage. In addition, the delay time formed with the cross of primary and secondary currents of the coupled inductor is manipulated to alleviate the reverse-recovery current of the output diode. It can achieve the aim of high-efficiency power conversion. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the variation of loads. Some experimental results via an example of a proton exchange membrane fuel cell power source with 250-W nominal rating are given to demonstrate the effectiveness of the proposed power conversion strategy
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high step up converter with coupled inductor
IEEE Transactions on Power Electronics, 2005Co-Authors: Rong-jong Wai, Rou-yong DuanAbstract:In this study, a high step-up converter with a coupled-inductor is investigated. In the proposed strategy, a coupled inductor with a lower-voltage-rated Switch is used for raising the voltage gain (whether the Switch is turned on or turned off). Moreover, a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the Switch Duty Cycle can be operated under a wide range, and the related voltage gain is higher than other coupled-inductor-based converters. In addition, all devices in this scheme also have voltage-clamped properties and their voltage stresses are relatively smaller than the output voltage. Thus, it can select low-voltage low-conduction-loss devices, and there are no reverse-recovery currents within the diodes in this circuit. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the load variations. As a result, the proposed converter topology can promote the voltage gain of a conventional boost converter with a single inductor, and deal with the problem of the leakage inductor and demagnetization of transformer for a coupled-inductor-based converter. Some experimental results via examples of a proton exchange membrane fuel cell (PEMFC) power source and a traditional battery are given to demonstrate the effectiveness of the proposed power conversion strategy.
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High Step-up Coupled-inductor-based Converter Using Bi-direction Energy Transmission
IEEE 36th Conference on Power Electronics Specialists 2005., 1Co-Authors: Rong-jong Wai, Rou-yong DuanAbstract:In this study, a high step-up converter with coupled-inductor by way of bi-direction energy transmission is investigated. In the proposed strategy, a coupled inductor with a lower-voltage-rated Switch is used for raising the voltage gain whether the Switch is turned on or turned off. Moreover, a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the Switch Duty Cycle can be operated under a wide range, and the related voltage gain is higher than other coupled-inductor-based converters. The capacity of the magnetic core can be utilized completely by way of bi-direction energy transmission. In addition, all devices in this scheme also have voltage-clamped properties and their voltage stresses are only related to the output voltage. Thus, it can select low-voltage low-conduction-loss devices, and there are no reverse-recovery currents within the diodes in this circuit. Some experimental results via an example of a proton exchange membrane fuel cell (PEMFC) power source are given to demonstrate the effectiveness of the proposed power conversion strategy
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High-efficiency DC-DC converter with high voltage gain and reduced Switch stress
30th Annual Conference of IEEE Industrial Electronics Society 2004. IECON 2004, 1Co-Authors: Rong-jong Wai, Chung-you Lin, Rou-yong DuanAbstract:In this study, a high-efficiency DC-DC converter with high voltage gain and reduced Switch stress is proposed. In the proposed topology, a three-winding coupled inductor is used for providing a high voltage gain without extreme Switch Duty-Cycle and enhancing the utility rate of magnetic core. Moreover, the energy in the leakage inductor is released directly to the output terminal for avoiding the phenomenon of circulating current and the production of Switch surge voltage. In addition, the delay time formed with the cross of primary and secondary currents of the coupled inductor is manipulated to alleviate the reverse-recovery current of the output diode. It can achieve the aim of high-efficiency power conversion. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the variation of loads. Some experimental results via an example of a proton exchange membrane fuel cell (PEMFC) power source with 250 watts nominal rating are given to demonstrate the effectiveness of the proposed power conversion strategy.
Rong-jong Wai - One of the best experts on this subject based on the ideXlab platform.
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high efficiency dc dc converter with high voltage gain and reduced Switch stress
IEEE Transactions on Industrial Electronics, 2007Co-Authors: Rong-jong Wai, Rou-yong Duan, Chung-you Lin, Yungruei ChangAbstract:In this paper, a high-efficiency dc-dc converter with high voltage gain and reduced Switch stress is proposed. Generally speaking, the utilization of a coupled inductor is useful for raising the step-up ratio of the conventional boost converter. However, the Switch surge voltage may be caused by the leakage inductor so that it will result in the requirement of high-voltage-rated devices. In the proposed topology, a three-winding coupled inductor is used for providing a high voltage gain without extreme Switch Duty-Cycle and enhancing the utility rate of magnetic core. Moreover, the energy in the leakage inductor is released directly to the output terminal for avoiding the phenomenon of circulating current and the production of Switch surge voltage. In addition, the delay time formed with the cross of primary and secondary currents of the coupled inductor is manipulated to alleviate the reverse-recovery current of the output diode. It can achieve the aim of high-efficiency power conversion. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the variation of loads. Some experimental results via an example of a proton exchange membrane fuel cell power source with 250-W nominal rating are given to demonstrate the effectiveness of the proposed power conversion strategy
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high step up converter with coupled inductor
IEEE Transactions on Power Electronics, 2005Co-Authors: Rong-jong Wai, Rou-yong DuanAbstract:In this study, a high step-up converter with a coupled-inductor is investigated. In the proposed strategy, a coupled inductor with a lower-voltage-rated Switch is used for raising the voltage gain (whether the Switch is turned on or turned off). Moreover, a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the Switch Duty Cycle can be operated under a wide range, and the related voltage gain is higher than other coupled-inductor-based converters. In addition, all devices in this scheme also have voltage-clamped properties and their voltage stresses are relatively smaller than the output voltage. Thus, it can select low-voltage low-conduction-loss devices, and there are no reverse-recovery currents within the diodes in this circuit. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the load variations. As a result, the proposed converter topology can promote the voltage gain of a conventional boost converter with a single inductor, and deal with the problem of the leakage inductor and demagnetization of transformer for a coupled-inductor-based converter. Some experimental results via examples of a proton exchange membrane fuel cell (PEMFC) power source and a traditional battery are given to demonstrate the effectiveness of the proposed power conversion strategy.
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High Step-up Coupled-inductor-based Converter Using Bi-direction Energy Transmission
IEEE 36th Conference on Power Electronics Specialists 2005., 1Co-Authors: Rong-jong Wai, Rou-yong DuanAbstract:In this study, a high step-up converter with coupled-inductor by way of bi-direction energy transmission is investigated. In the proposed strategy, a coupled inductor with a lower-voltage-rated Switch is used for raising the voltage gain whether the Switch is turned on or turned off. Moreover, a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the Switch Duty Cycle can be operated under a wide range, and the related voltage gain is higher than other coupled-inductor-based converters. The capacity of the magnetic core can be utilized completely by way of bi-direction energy transmission. In addition, all devices in this scheme also have voltage-clamped properties and their voltage stresses are only related to the output voltage. Thus, it can select low-voltage low-conduction-loss devices, and there are no reverse-recovery currents within the diodes in this circuit. Some experimental results via an example of a proton exchange membrane fuel cell (PEMFC) power source are given to demonstrate the effectiveness of the proposed power conversion strategy
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High-efficiency DC-DC converter with high voltage gain and reduced Switch stress
30th Annual Conference of IEEE Industrial Electronics Society 2004. IECON 2004, 1Co-Authors: Rong-jong Wai, Chung-you Lin, Rou-yong DuanAbstract:In this study, a high-efficiency DC-DC converter with high voltage gain and reduced Switch stress is proposed. In the proposed topology, a three-winding coupled inductor is used for providing a high voltage gain without extreme Switch Duty-Cycle and enhancing the utility rate of magnetic core. Moreover, the energy in the leakage inductor is released directly to the output terminal for avoiding the phenomenon of circulating current and the production of Switch surge voltage. In addition, the delay time formed with the cross of primary and secondary currents of the coupled inductor is manipulated to alleviate the reverse-recovery current of the output diode. It can achieve the aim of high-efficiency power conversion. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the variation of loads. Some experimental results via an example of a proton exchange membrane fuel cell (PEMFC) power source with 250 watts nominal rating are given to demonstrate the effectiveness of the proposed power conversion strategy.
Hussain M Behbehani - One of the best experts on this subject based on the ideXlab platform.
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high voltage step up integrated double boost sepic dc dc converter for fuel cell and photovoltaic applications
Renewable Energy, 2015Co-Authors: Ahmad J Sabzali, Esam H Ismail, Hussain M BehbehaniAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100-W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
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High voltage step-up integrated double Boost–Sepic DC–DC converter for fuel-cell and photovoltaic applications
Renewable Energy, 2015Co-Authors: Ahmad J Sabzali, Esam H Ismail, Hussain M BehbehaniAbstract:In this paper, an integrated double boost SEPIC (IDBS) converter is proposed as a high step-up converter. The proposed converter utilizes a single controlled power Switch and two inductors and is able to provide high voltage gain without extreme Switch Duty-Cycle. The two inductors can be coupled into one core for reducing the input current ripple without affecting the basic DC characteristic of the converter. Moreover, the voltage stresses across all the semiconductors are less than half of the output voltage. The reduced voltage stress across the power Switch enables the use of a lower voltage and RDS-ON MOSFET Switch, which will further reduce the conduction losses. Whereas, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the Switching and conduction losses. A detailed circuit analysis is performed to derive the design equations. A design example for a 100-W/240 Vdc with 24 Vdc input voltage is provided. The feasibility of the converter is confirmed with results obtained from simulation and an experimental prototype.
