The Experts below are selected from a list of 25728 Experts worldwide ranked by ideXlab platform
Yi Zhao - One of the best experts on this subject based on the ideXlab platform.
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Zero-voltage-switching dual-boost converter with multi-functional inductors and improved symmetrical rectifier for distributed generation systems
IET Power Electronics, 2012Co-Authors: Yi Zhao, Huan YangAbstract:In this study, an advanced interleaved active clamp dual-boost converter is proposed for distributed generation systems with large input current, high-Output-voltage and high-step-up conversion. There are only two coupled inductors in the proposed converter and both of them can be integrated into one magnetic core to improve the power density. The multi-functional integrated inductors can serve as inductors for current ripple cancellation and transformer for primary-secondary isolation. Furthermore, an improved voltage-doubler configuration is derived on the secondary side to make the Output Diodes sustain only half of the high Output voltage. The Output Diode voltage stress can be auto-balanced because of the secondary series-connected structure of the multi-functional integrated inductors. In addition, zero-voltage-switching operation is achieved for all the primary switches during the switching transition. The Output Diode reverse-recovery problem is alleviated because of the leakage inductance. Finally, a 1-kW 40-380-V prototype is built to demonstrate the effectiveness of the theoretical analysis.
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interleaved high step up converter with winding cross coupled inductors and voltage multiplier cells
IEEE Transactions on Power Electronics, 2012Co-Authors: Wuhua Li, Yi Zhao, Jiande Wu, Xiangning HeAbstract:The concept of winding-cross-coupled inductors (WCCIs) and voltage multiplier cells is integrated to derive a novel interleaved high step-up converter in this paper. The voltage gain is extended and the switch voltage stress is reduced by the WCCIs and the voltage multiplier cells in the presented circuit, which minimizes the peak current ripple of the power devices and makes low-voltage MOSFETs with high performance available in high step-up and high Output voltage applications. Moreover, the Output Diode reverse-recovery problem is alleviated by the leakage inductance of the WCCIs, which reduces the reverse-recovery losses. Zero current switching (ZCS) turn-on is realized for the power switches to reduce the switching losses. Furthermore, the voltage spikes on the MOSFETs are clamped and the leakage energy is recycled by the voltage multiplier cells, when the switch turns off. A 1 kW prototype with 35-45 V input and 380 V Output operating at 50 kHz switching frequency is built and tested to verify the significant improvements of the proposed converter.
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interleaved high step up converter with winding cross coupled inductors and voltage multiplier cells
IEEE Transactions on Power Electronics, 2012Co-Authors: Yi ZhaoAbstract:The concept of winding-cross-coupled inductors (WCCIs) and voltage multiplier cells is integrated to derive a novel interleaved high step-up converter in this paper. The voltage gain is extended and the switch voltage stress is reduced by the WCCIs and the voltage multiplier cells in the presented circuit, which minimizes the peak current ripple of the power devices and makes low-voltage MOSFETs with high performance available in high step-up and high Output voltage applications. Moreover, the Output Diode reverse-recovery problem is alleviated by the leakage inductance of the WCCIs, which reduces the reverse-recovery losses. Zero current switching (ZCS) turn-on is realized for the power switches to reduce the switching losses. Furthermore, the voltage spikes on the MOSFETs are clamped and the leakage energy is recycled by the voltage multiplier cells, when the switch turns off. A 1 kW prototype with 35-45 V input and 380 V Output operating at 50 kHz switching frequency is built and tested to verify the significant improvements of the proposed converter.
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Interleaved ZVS Flyback-Forward converter with reduced Output voltage stress on secondary rectifier Diodes
2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2011Co-Authors: Yi ZhaoAbstract:In this paper, a novel active clamp Flyback-Forward converter is proposed for large voltage gain and high power applications. The interleaved configuration on the primary side is employed to handle the large input current. An improved voltage doubler configuration is adopted on the secondary side to make the Output Diodes sustain only half of the high Output voltage. Furthermore, the Output Diode voltage stress can be auto-balanced due to the inherent series structure of the coupled inductors. Therefore, the low voltage stress Diodes can be used to enhance the circuit performance. Moreover, the active clamp circuits can be employed to recycle the leakage energy and absorb the possible turn-off voltage spikes on the primary power devices. In addition, zero-voltage-switching (ZVS) soft switching operation is achieved for all the active switches during the switching transition. The Output Diode reverse-recovery problem is alleviated due to the leakage inductance, leading to a great reduction of switching losses. Finally, a 40V-input 380V-Output 1kW prototype is built to demonstrate the effectiveness of the theoretical analysis.
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interleaved converter with voltage multiplier cell for high step up and high efficiency conversion
IEEE Transactions on Power Electronics, 2010Co-Authors: Wuhua Li, Yi Zhao, Yan Deng, Xiangning HeAbstract:A novel interleaved high step-up converter with voltage multiplier cell is proposed in this paper to avoid the extremely narrow turn-off period and to reduce the current ripple, which flows through the power devices compared with the conventional interleaved boost converter in high step-up applications. Interleaved structure is employed in the input side to distribute the input current, and the voltage multiplier cell is adopted in the Output side to achieve a high step-up gain. The voltage multiplier cell is composed of the secondary windings of the coupled inductors, a series capacitor, and two Diodes. Furthermore, the switch voltage stress is reduced due to the transformer function of the coupled inductors, which makes low-voltage-rated MOSFETs available to reduce the conduction losses. Moreover, zero-current-switching turn- on soft-switching performance is realized to reduce the switching losses. In addition, the Output Diode turn-off current falling rate is controlled by the leakage inductance of the coupled inductors, which alleviates the Diode reverse recovery problem. Additional active device is not required in the proposed converter, which makes the presented circuit easy to design and control. Finally, a 1-kW 40-V-input 380-V-Output prototype operating at 100 kHz switching frequency is built and tested to verify the effectiveness of the presented converter.
Xiangning He - One of the best experts on this subject based on the ideXlab platform.
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interleaved high step up converter with winding cross coupled inductors and voltage multiplier cells
IEEE Transactions on Power Electronics, 2012Co-Authors: Wuhua Li, Yi Zhao, Jiande Wu, Xiangning HeAbstract:The concept of winding-cross-coupled inductors (WCCIs) and voltage multiplier cells is integrated to derive a novel interleaved high step-up converter in this paper. The voltage gain is extended and the switch voltage stress is reduced by the WCCIs and the voltage multiplier cells in the presented circuit, which minimizes the peak current ripple of the power devices and makes low-voltage MOSFETs with high performance available in high step-up and high Output voltage applications. Moreover, the Output Diode reverse-recovery problem is alleviated by the leakage inductance of the WCCIs, which reduces the reverse-recovery losses. Zero current switching (ZCS) turn-on is realized for the power switches to reduce the switching losses. Furthermore, the voltage spikes on the MOSFETs are clamped and the leakage energy is recycled by the voltage multiplier cells, when the switch turns off. A 1 kW prototype with 35-45 V input and 380 V Output operating at 50 kHz switching frequency is built and tested to verify the significant improvements of the proposed converter.
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interleaved converter with voltage multiplier cell for high step up and high efficiency conversion
IEEE Transactions on Power Electronics, 2010Co-Authors: Wuhua Li, Yi Zhao, Yan Deng, Xiangning HeAbstract:A novel interleaved high step-up converter with voltage multiplier cell is proposed in this paper to avoid the extremely narrow turn-off period and to reduce the current ripple, which flows through the power devices compared with the conventional interleaved boost converter in high step-up applications. Interleaved structure is employed in the input side to distribute the input current, and the voltage multiplier cell is adopted in the Output side to achieve a high step-up gain. The voltage multiplier cell is composed of the secondary windings of the coupled inductors, a series capacitor, and two Diodes. Furthermore, the switch voltage stress is reduced due to the transformer function of the coupled inductors, which makes low-voltage-rated MOSFETs available to reduce the conduction losses. Moreover, zero-current-switching turn- on soft-switching performance is realized to reduce the switching losses. In addition, the Output Diode turn-off current falling rate is controlled by the leakage inductance of the coupled inductors, which alleviates the Diode reverse recovery problem. Additional active device is not required in the proposed converter, which makes the presented circuit easy to design and control. Finally, a 1-kW 40-V-input 380-V-Output prototype operating at 100 kHz switching frequency is built and tested to verify the effectiveness of the presented converter.
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high step up soft switching interleaved boost converters with cross winding coupled inductors and reduced auxiliary switch number
Iet Power Electronics, 2009Co-Authors: Wuhua Li, Xiangning HeAbstract:An interleaved boost converter is proposed to extend the voltage gain and to reduce the switch voltage stress compared with the conventional interleaved boost converter in high step-up applications. With the topology variation, only one set of active clamp circuit is necessary for the interleaved two phases to recycle the leakage energy and to absorb the voltage spikes caused by the leakage inductance of the winding-coupled inductors. Both the main switches and the clamp switch of the proposed converter are ZVT soft switching performances during the whole switching transition, which minimises the switching losses. The Output Diode turn-off current falling rate is controlled by the leakage inductance, which alleviates the Output Diode reverse-recovery problem and reduces the relative reverse-recovery losses. The experimental results based on a 40-380-V DC/DC prototype verify the effectiveness of the theoretical analysis.
Wuhua Li - One of the best experts on this subject based on the ideXlab platform.
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interleaved high step up converter with winding cross coupled inductors and voltage multiplier cells
IEEE Transactions on Power Electronics, 2012Co-Authors: Wuhua Li, Yi Zhao, Jiande Wu, Xiangning HeAbstract:The concept of winding-cross-coupled inductors (WCCIs) and voltage multiplier cells is integrated to derive a novel interleaved high step-up converter in this paper. The voltage gain is extended and the switch voltage stress is reduced by the WCCIs and the voltage multiplier cells in the presented circuit, which minimizes the peak current ripple of the power devices and makes low-voltage MOSFETs with high performance available in high step-up and high Output voltage applications. Moreover, the Output Diode reverse-recovery problem is alleviated by the leakage inductance of the WCCIs, which reduces the reverse-recovery losses. Zero current switching (ZCS) turn-on is realized for the power switches to reduce the switching losses. Furthermore, the voltage spikes on the MOSFETs are clamped and the leakage energy is recycled by the voltage multiplier cells, when the switch turns off. A 1 kW prototype with 35-45 V input and 380 V Output operating at 50 kHz switching frequency is built and tested to verify the significant improvements of the proposed converter.
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interleaved converter with voltage multiplier cell for high step up and high efficiency conversion
IEEE Transactions on Power Electronics, 2010Co-Authors: Wuhua Li, Yi Zhao, Yan Deng, Xiangning HeAbstract:A novel interleaved high step-up converter with voltage multiplier cell is proposed in this paper to avoid the extremely narrow turn-off period and to reduce the current ripple, which flows through the power devices compared with the conventional interleaved boost converter in high step-up applications. Interleaved structure is employed in the input side to distribute the input current, and the voltage multiplier cell is adopted in the Output side to achieve a high step-up gain. The voltage multiplier cell is composed of the secondary windings of the coupled inductors, a series capacitor, and two Diodes. Furthermore, the switch voltage stress is reduced due to the transformer function of the coupled inductors, which makes low-voltage-rated MOSFETs available to reduce the conduction losses. Moreover, zero-current-switching turn- on soft-switching performance is realized to reduce the switching losses. In addition, the Output Diode turn-off current falling rate is controlled by the leakage inductance of the coupled inductors, which alleviates the Diode reverse recovery problem. Additional active device is not required in the proposed converter, which makes the presented circuit easy to design and control. Finally, a 1-kW 40-V-input 380-V-Output prototype operating at 100 kHz switching frequency is built and tested to verify the effectiveness of the presented converter.
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high step up soft switching interleaved boost converters with cross winding coupled inductors and reduced auxiliary switch number
Iet Power Electronics, 2009Co-Authors: Wuhua Li, Xiangning HeAbstract:An interleaved boost converter is proposed to extend the voltage gain and to reduce the switch voltage stress compared with the conventional interleaved boost converter in high step-up applications. With the topology variation, only one set of active clamp circuit is necessary for the interleaved two phases to recycle the leakage energy and to absorb the voltage spikes caused by the leakage inductance of the winding-coupled inductors. Both the main switches and the clamp switch of the proposed converter are ZVT soft switching performances during the whole switching transition, which minimises the switching losses. The Output Diode turn-off current falling rate is controlled by the leakage inductance, which alleviates the Output Diode reverse-recovery problem and reduces the relative reverse-recovery losses. The experimental results based on a 40-380-V DC/DC prototype verify the effectiveness of the theoretical analysis.
Atsuo Kawamura - One of the best experts on this subject based on the ideXlab platform.
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Buck/Boost DC–DC Converter Topology With Soft Switching in the Whole Operating Region
IEEE Transactions on Power Electronics, 2014Co-Authors: Martin Pavlovsky, Giuseppe Guidi, Atsuo KawamuraAbstract:This paper proposes a buck/boost dc-dc converter topology based on the principle of auxiliary resonant commutated pole. The used snubber is fairly simple yet effective in reducing the switching losses. All active devices operate with soft switching, and switching noise is suppressed as much as possible. In addition to the conventional active switch loss reduction, the snubber participates in suppression of Output Diode reverse recovery. Moreover, complete soft switching in the whole operating region is achieved through controlled extended reverse conduction of synchronous rectifier. The topology was implemented in a 14 kW converter prototype operating at 62.5 kHz and tested with complete closed-loop control. Experimental efficiencies in the range of 98.5% show that the proposed circuit is highly capable while remaining sufficiently simple.
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buck boost dc dc converter topology with soft switching in the whole operating region
IEEE Transactions on Power Electronics, 2014Co-Authors: Martin Pavlovsky, Giuseppe Guidi, Atsuo KawamuraAbstract:This paper proposes a buck/boost dc-dc converter topology based on the principle of auxiliary resonant commutated pole. The used snubber is fairly simple yet effective in reducing the switching losses. All active devices operate with soft switching, and switching noise is suppressed as much as possible. In addition to the conventional active switch loss reduction, the snubber participates in suppression of Output Diode reverse recovery. Moreover, complete soft switching in the whole operating region is achieved through controlled extended reverse conduction of synchronous rectifier. The topology was implemented in a 14 kW converter prototype operating at 62.5 kHz and tested with complete closed-loop control. Experimental efficiencies in the range of 98.5% show that the proposed circuit is highly capable while remaining sufficiently simple.
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buck boost dc dc converter with simple auxiliary snubber and complete soft switching in whole operating region
European Conference on Cognitive Ergonomics, 2012Co-Authors: Martin Pavlovsky, Atsuo Kawamura, Giuseppe GuidiAbstract:The paper proposes a buck/boost dc-dc converter topology based on a simple auxiliary snubber. The snubber is simple yet effective in reducing the switching losses. In addition to the conventional active switch loss reduction, the snubber can participate in suppression of Output Diode reverse recovery through synchronous rectifications and it can also be used to provide complete soft switching in the whole operating region through extended conduction of synchronous rectifier. Experimental efficiencies in the range of 98.5 % show that the proposed circuit is highly capable while remaining simple.
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Buck/boost Dc-Dc converter with simple auxiliary snubber and complete soft switching in whole operating region
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012Co-Authors: Martin Pavlovsky, Atsuo Kawamura, Giuseppe GuidiAbstract:The paper proposes a buck/boost dc-dc converter topology based on a simple auxiliary snubber. The snubber is simple yet effective in reducing the switching losses. In addition to the conventional active switch loss reduction, the snubber can participate in suppression of Output Diode reverse recovery through synchronous rectifications and it can also be used to provide complete soft switching in the whole operating region through extended conduction of synchronous rectifier. Experimental efficiencies in the range of 98.5 % show that the proposed circuit is highly capable while remaining simple.
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Very high efficiency SAZZ chopper using high speed IGBT
2009 IEEE 6th International Power Electronics and Motion Control Conference, 2009Co-Authors: Yukinori Tsuruta, Martin Pavlovsky, Atsuo KawamuraAbstract:In this paper a study for very high efficiency targeting 99 % range converter is described. We have proposed a new soft switching boost type chopper based on snubber assisted zero voltage and zero current transition (SAZZ) with Output Diode fabricated “SiC schottky Diode”. The Output power of 8 kW with the efficiency of 98.96% was obtained. The loss breakdown evaluation of SiC-SAZZ is discussed.
Zhengming Zhao - One of the best experts on this subject based on the ideXlab platform.
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A Novel Soft-Switching Boost Converter With Magnetically Coupled Resonant Snubber
IEEE Transactions on Power Electronics, 2014Co-Authors: Zhan Tianwen, Yingchao Zhang, Nie Jintong, Yongchang Zhang, Zhengming ZhaoAbstract:A novel soft-switching boost converter with a magnetically coupled resonant snubber is presented in this paper. The passive snubber circuit, which is composed of two Diodes, two capacitors, and one coupled inductor, ensures a zero current turn-on and zero voltage turn-off conditions for the power switch, and alleviates the reverse-recovery problem for the Output Diode. Moreover, with the proper design of the snubber circuit, the power switch and Output Diode can be softly switched in a wide load range. The operating principle and performance analysis of the proposed converter are described in detail. The experiment from a 400 W prototype has been carried out and the results show that the proposed converter has the advantages of simple structure, low complexity control, and the highest efficiency is more than 95%.
