The Experts below are selected from a list of 3363 Experts worldwide ranked by ideXlab platform
Gun-woo Moon - One of the best experts on this subject based on the ideXlab platform.
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High-Efficiency Slim Adapter With Low-Profile Transformer Structure
IEEE Transactions on Industrial Electronics, 2012Co-Authors: Gun-woo MoonAbstract:This paper presents the implementation of a high-efficiency slim adapter using an resonant converter. A new structure of the slim-type transformer is proposed, which is composed of copper wire as the Primary Winding and printed-circuit-board Winding on the outer layer as the secondary Winding. The proposed structure is suitable for a slim and high-efficiency converter because it has advantages of easy utilization and wide conductive cross-sectional area. In addition, the voltage-doubler rectifier is applied to the secondary side due to its simple structure of secondary Winding, and a filter is adopted to reduce the output filter size. The validity of this study is confirmed by the experimental results from an 85-W prototype.
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High efficiency slim adapter with low profile transformer structure
8th International Conference on Power Electronics - ECCE Asia, 2011Co-Authors: Gun-woo MoonAbstract:This paper presents the implementation of high efficiency slim adapter using LLC resonant converter. A new structure of slim-type transformer is proposed, which is composed of copper wire as Primary Winding and printed circuit-board(PCB)-Winding on the outer layer as secondary Winding. The proposed structure is suitable for slim and high efficiency converter because it has advantages of easy utilization and wide conductive cross-sectional area. In addition, the voltage-doubler rectifier is applied to the secondary side due to its simple structure of secondary Winding and CLC filter is adopted to reduce output filter size. The validity of this study is confirmed by the experimental results from an 85W prototype.
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Individual Charge Equalization Converter with Parallel Primary Winding of Transformer for Series Connected Lithium-Ion Battery Strings in an HEV
Journal of Power Electronics, 2009Co-Authors: Hong-sun Park, Gun-woo MoonAbstract:In this paper, a charge equalization converter with parallel-connected Primary Windings of transformers is proposed. The proposed work effectively balances the voltage among Lithium-Ion battery cells despite each battery cell has low voltage gap compared with its state of charge (SOC). The principle of the proposed work is that the equalizing energy from all battery strings moves to the lowest voltage battery through the isolated dc/dc converter controlled by the corresponding solid state relay switch. For this research a prototype of four Lithium-Ion battery cells is optimally designed and implemented, and experimental results show that the proposed method has excellent cell balancing performance.
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ZVS phase shift full bridge converter with separated Primary Winding
2009 IEEE Energy Conversion Congress and Exposition, 2009Co-Authors: Young-do Kim, Chong Eun Kim, Ki Bum Park, Kyu-min Cho, Gun-woo MoonAbstract:Generally additional leakage inductance and two clamp diodes are adopted into the conventional phase shift full bridge (PSFB) converter for reducing the voltage stress of secondary rectifier diodes and extending the range of zero voltage switching (ZVS) operation. However, the core and copper loss caused by additional leakage inductor can be high enough to decrease the whole efficiency of DC/DC converter. Therefore, a new ZVS PSFB converter with separated Primary Winding (SPW) is proposed. The proposed converter makes both the transformer and additional leakage inductor with same ferrite core by separating the Primary Winding method. Using this method, leakage inductance is controlled by the Winding ratio of SPW. Moreover, by using this integrated magnetic component with single core, size and core loss can be greatly reduced and it results in the improvement of efficiency and power density of DC/DC converter. The operational principle and analysis of proposed converter are presented and verified by the 1.2 kW prototype.
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ZVS phase shift full bridge converter with controlled leakage inductance of transformer
INTELEC 2009 - 31st International Telecommunications Energy Conference, 2009Co-Authors: Young-do Kim, Chong Eun Kim, Ki Bum Park, Kyu-min Cho, Gun-woo MoonAbstract:Generally additional leakage inductance and two clamp diodes are adopted into the conventional phase shift full bridge (PSFB) converter for reducing the voltage stress of secondary rectifier diodes and extending the range of zero voltage switching (ZVS) operation. However, the core and copper loss caused by additional leakage inductor can be high enough to decrease the whole efficiency of DC/DC converter. Therefore, a new ZVS PSFB converter with controlled leakage inductance of transformer is proposed. The proposed converter makes both the transformer and additional leakage inductor with same ferrite core by separated Primary Winding (SPW). Using this method, leakage inductance is controlled by the Winding ratio of SPW. Moreover, by using this integrated magnetic component with single core, size and core loss can be greatly reduced and it results in the improvement of efficiency and power density of DC/DC converter. The operational principle and analysis of proposed converter are presented and verified by the 1.2 kW prototype.
Xinbo Ruan - One of the best experts on this subject based on the ideXlab platform.
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isolated single Primary Winding multiple input converters
IEEE Transactions on Power Electronics, 2011Co-Authors: Qin Wang, Xinbo Ruan, Jie Zhang, Ke JinAbstract:Multiple-input converters (MICs) have attracted more attentions because of its simpler structure and less devices. In the traditional isolated MICs, each input source always has a Primary Winding, sharing a secondary Winding. When the number of the input sources increases, the number of the Primary Windings increases, resulting in complicated structure of the transformer, poor coupling, and large leakage inductors. This paper first introduces the concept of pulsating source cells (PSCs), including pulsating voltage source cells and pulsating current source cells, and the connection rules for the PSCs. Then, series- or parallel-connected PSCs are used to replace the input dc voltage source or input dc current source in the isolated single-input converter, and a family of isolated single Primary Winding (SPW) MICs is proposed. Compared to the traditional isolated MICs, the transformer has only one Primary Winding, leading to a simplified structure and ease for manufacturing. Furthermore, the voltage stress of the power switches is reduced. The control method of the proposed isolated SPW MICs is proposed. Finally, a flyback SPW double-input converter is analyzed as an example. The operation principle and control method are discussed and a prototype is built to demonstrate the feasibility of this topology.
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a double input flyback dc dc converter with single Primary Winding
Energy Conversion Congress and Exposition, 2010Co-Authors: Qin Wang, Xinbo Ruan, Jie Zhang, Ke JinAbstract:The traditional isolated multiple-input converter (MIC) has a simple configuration and can be used in the system with two or more sources. However, it has some disadvantages such as complex transformer structure due to multiple Primary Windings, higher voltage stresses on the power switches, and only one source transferring energy to the load at any time. This paper proposes a novel family of isolated MICs, in which the number of the transformer Primary Windings is reduced and the voltage stresses on the power switches are lower than that in the traditional multiple-input converter. A double-input Flyback DC/DC converter is taken as an example to analyze its operation principle in detail, and the voltage conversion ratio between the input and output is also deduced. Then the power management strategy for the proposed converter to distribute the power reasonably to the sources is proposed and it achieved the priority of the new energy utilization. A 120 W prototype with two input sources was built and tested, and the experimental results are presented to verify the theoretical analysis and the effectiveness of the control strategy.
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a novel zero voltage and zero current switching pwm full bridge converter using two diodes in series with the lagging leg
IEEE Transactions on Industrial Electronics, 2001Co-Authors: Xinbo RuanAbstract:This paper proposes a novel phase-shifted zero-voltage and zero-current-switching (ZVZCS) pulsewidth modulation full-bridge converter, which realizes ZVS for the leading leg and ZCS for the lagging leg. A blocking capacitor is added in series with the Primary Winding of the transformer to make the Primary current decay to zero during zero state to ensure ZCS for the lagging leg. In order to prevent the Primary current from reversing during zero state, two diodes in series with the lagging leg are added. The principle of operation, steady-state analysis, and design procedures are presented. The experimental results are also included to verify the theoretical analysis.
Xinke Wu - One of the best experts on this subject based on the ideXlab platform.
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Low Common Mode Noise Half-Bridge LLC DC–DC Converter With an Asymmetric Center Tapped Rectifier
IEEE Transactions on Power Electronics, 2019Co-Authors: Siliang Zhang, Xinke WuAbstract:Half-bridge LLC dc-dc converter is popular in electric vehicle on-board charger due to its soft switching, high-power density, and low cost. But, it also has serious electromagnetic interference problems in that the half-bridge structure brings asymmetry common mode (CM) noise source by switching. So, this letter proposes an asymmetric center tapped rectifier (ACTR) to reduce the CM noise in half-bridge LLC without additional components. With ACTR, the CM noise source on Primary Winding is cancelled by CM noise sources on secondary Windings. The CM noise reduction of the proposed ACTR is verified by a 1.1-kW half-bridge LLC prototype with 800 V input and 300-450 V output.
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a new current driven synchronous rectifier for series parallel resonant llc dc dc converter
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Xinke Wu, Junming Zhang, Zhaoming QianAbstract:A new synchronous rectifier (SR) driving method is proposed using Primary current sensing in this paper. Because the magnetizing current of transformer is included in the Primary Winding of transformer, it cannot be used to generate the driving signals of SRs directly. A current-compensating Winding in current transformer (CT) is used to cancel out the magnetizing current and generate suitable driving signals for SR. Therefore, one CT is used to generate two driving signals for two SRs in LLC converter with a center-tapped rectifier. This current-driven method is simple and low cost for high-output-current dc-dc application. A 150-W dc-dc prototype using LLC half-bridge converter with the proposed SR circuit is built up to verify the theoretical analysis.
Ke Jin - One of the best experts on this subject based on the ideXlab platform.
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isolated single Primary Winding multiple input converters
IEEE Transactions on Power Electronics, 2011Co-Authors: Qin Wang, Xinbo Ruan, Jie Zhang, Ke JinAbstract:Multiple-input converters (MICs) have attracted more attentions because of its simpler structure and less devices. In the traditional isolated MICs, each input source always has a Primary Winding, sharing a secondary Winding. When the number of the input sources increases, the number of the Primary Windings increases, resulting in complicated structure of the transformer, poor coupling, and large leakage inductors. This paper first introduces the concept of pulsating source cells (PSCs), including pulsating voltage source cells and pulsating current source cells, and the connection rules for the PSCs. Then, series- or parallel-connected PSCs are used to replace the input dc voltage source or input dc current source in the isolated single-input converter, and a family of isolated single Primary Winding (SPW) MICs is proposed. Compared to the traditional isolated MICs, the transformer has only one Primary Winding, leading to a simplified structure and ease for manufacturing. Furthermore, the voltage stress of the power switches is reduced. The control method of the proposed isolated SPW MICs is proposed. Finally, a flyback SPW double-input converter is analyzed as an example. The operation principle and control method are discussed and a prototype is built to demonstrate the feasibility of this topology.
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a double input flyback dc dc converter with single Primary Winding
Energy Conversion Congress and Exposition, 2010Co-Authors: Qin Wang, Xinbo Ruan, Jie Zhang, Ke JinAbstract:The traditional isolated multiple-input converter (MIC) has a simple configuration and can be used in the system with two or more sources. However, it has some disadvantages such as complex transformer structure due to multiple Primary Windings, higher voltage stresses on the power switches, and only one source transferring energy to the load at any time. This paper proposes a novel family of isolated MICs, in which the number of the transformer Primary Windings is reduced and the voltage stresses on the power switches are lower than that in the traditional multiple-input converter. A double-input Flyback DC/DC converter is taken as an example to analyze its operation principle in detail, and the voltage conversion ratio between the input and output is also deduced. Then the power management strategy for the proposed converter to distribute the power reasonably to the sources is proposed and it achieved the priority of the new energy utilization. A 120 W prototype with two input sources was built and tested, and the experimental results are presented to verify the theoretical analysis and the effectiveness of the control strategy.
Qin Wang - One of the best experts on this subject based on the ideXlab platform.
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isolated single Primary Winding multiple input converters
IEEE Transactions on Power Electronics, 2011Co-Authors: Qin Wang, Xinbo Ruan, Jie Zhang, Ke JinAbstract:Multiple-input converters (MICs) have attracted more attentions because of its simpler structure and less devices. In the traditional isolated MICs, each input source always has a Primary Winding, sharing a secondary Winding. When the number of the input sources increases, the number of the Primary Windings increases, resulting in complicated structure of the transformer, poor coupling, and large leakage inductors. This paper first introduces the concept of pulsating source cells (PSCs), including pulsating voltage source cells and pulsating current source cells, and the connection rules for the PSCs. Then, series- or parallel-connected PSCs are used to replace the input dc voltage source or input dc current source in the isolated single-input converter, and a family of isolated single Primary Winding (SPW) MICs is proposed. Compared to the traditional isolated MICs, the transformer has only one Primary Winding, leading to a simplified structure and ease for manufacturing. Furthermore, the voltage stress of the power switches is reduced. The control method of the proposed isolated SPW MICs is proposed. Finally, a flyback SPW double-input converter is analyzed as an example. The operation principle and control method are discussed and a prototype is built to demonstrate the feasibility of this topology.
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a double input flyback dc dc converter with single Primary Winding
Energy Conversion Congress and Exposition, 2010Co-Authors: Qin Wang, Xinbo Ruan, Jie Zhang, Ke JinAbstract:The traditional isolated multiple-input converter (MIC) has a simple configuration and can be used in the system with two or more sources. However, it has some disadvantages such as complex transformer structure due to multiple Primary Windings, higher voltage stresses on the power switches, and only one source transferring energy to the load at any time. This paper proposes a novel family of isolated MICs, in which the number of the transformer Primary Windings is reduced and the voltage stresses on the power switches are lower than that in the traditional multiple-input converter. A double-input Flyback DC/DC converter is taken as an example to analyze its operation principle in detail, and the voltage conversion ratio between the input and output is also deduced. Then the power management strategy for the proposed converter to distribute the power reasonably to the sources is proposed and it achieved the priority of the new energy utilization. A 120 W prototype with two input sources was built and tested, and the experimental results are presented to verify the theoretical analysis and the effectiveness of the control strategy.