The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jihsheng Lai - One of the best experts on this subject based on the ideXlab platform.
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zero voltage Switching pwm resonant full bridge converter with minimized circulating losses and minimal voltage stresses of bridge rectifiers for electric vehicle battery chargers
IEEE Transactions on Power Electronics, 2013Co-Authors: Bin Gu, Chienyu Lin, Baifeng Chen, Jason Dominic, Jihsheng LaiAbstract:This paper presents a zero-voltage-Switching (ZVS) full-bridge dc-dc converter combing resonant and pulse-width-modulation (PWM) power conversions for electric vehicle battery chargers. In the proposed converter, a half-bridge LLC resonant Circuit shares the lagging leg with a phase-shift full-bridge (PSFB) dc-dc Circuit to guarantee ZVS of the lagging-leg switches from zero to full load. A secondary-side hybrid-Switching Circuit, which is formed by the leakage inductance, output inductor of the PSFB dc-dc Circuit, a small additional resonant capacitor, and two additional diodes, is integrated at the secondary side of the PSFB dc-dc Circuit. With the clamp path of a hybrid-Switching Circuit, the voltage overshoots that arise during the turn off of the rectifier diodes are eliminated and the voltage of bridge rectifier is clamped to the minimal achievable value, which is equal to secondary-reflected input voltage of the transformer. The sum of the output voltage of LLC resonant Circuit and the resonant capacitor voltage of the hybrid-Switching Circuit is applied between the bridge rectifier and the output inductor of the PSFB dc-dc Circuit during the freewheeling phases. As a result, the primary-side circulating current of the PSFB dc-dc Circuit is instantly reset to zero, achieving minimized circulating losses. The effectiveness of the proposed converter was experimentally verified using a 4-kW prototype Circuit. The experimental results show 98.6% peak efficiency and high efficiency over wide load and output voltage ranges.
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Hybrid-Switching Full-Bridge DC–DC Converter With Minimal Voltage Stress of Bridge Rectifier, Reduced Circulating Losses, and Filter Requirement for Electric Vehicle Battery Chargers
IEEE Transactions on Power Electronics, 2013Co-Authors: Bin Gu, Nathan Kees, Jihsheng Lai, Cong ZhengAbstract:This paper first presents a hybrid-Switching step-down dc-dc converter, and then, by introducing transformer isolation, a novel hybrid-Switching phase-shift full-bridge dc-dc converter is derived for electric vehicle battery chargers. The proposed converter provides wide zero-voltage-Switching range in the leading-leg switches, achieves zero-current-Switching for lagging-leg switches, and uses a hybrid-Switching method to avoid freewheeling circulating losses in the primary side. Because the resonant capacitor voltage of the hybrid-Switching Circuit is applied between the bridge rectifier and the output inductor for the duration of the freewheeling intervals, a smaller sized output inductor can be utilized. With the current rectifier diode of the hybrid-Switching Circuit providing a clamping path, the voltage overshoots that arise during the turn-off of the rectifier diodes are eliminated and the voltage stress of bridge rectifier is clamped to the minimal achievable value, which is equal to secondary-reflected input voltage of the transformer. The inductive energy stored in the output inductor and the capacitive energy stored in the resonant capacitor of the hybrid-Switching Circuit are transferred to the output simultaneously during the freewheeling intervals with only one diode in series in the current path, achieving more effective and efficient energy transfer. The effectiveness of the proposed converter was experimentally verified using a 3.6-kW prototype Circuit designed for electric vehicle onboard chargers. Experimental results of the hardware prototype show that the converter achieves a peak efficiency of 98.1% and high system efficiencies over wide output voltage and power ranges.
Bin Gu - One of the best experts on this subject based on the ideXlab platform.
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zero voltage Switching pwm resonant full bridge converter with minimized circulating losses and minimal voltage stresses of bridge rectifiers for electric vehicle battery chargers
IEEE Transactions on Power Electronics, 2013Co-Authors: Bin Gu, Chienyu Lin, Baifeng Chen, Jason Dominic, Jihsheng LaiAbstract:This paper presents a zero-voltage-Switching (ZVS) full-bridge dc-dc converter combing resonant and pulse-width-modulation (PWM) power conversions for electric vehicle battery chargers. In the proposed converter, a half-bridge LLC resonant Circuit shares the lagging leg with a phase-shift full-bridge (PSFB) dc-dc Circuit to guarantee ZVS of the lagging-leg switches from zero to full load. A secondary-side hybrid-Switching Circuit, which is formed by the leakage inductance, output inductor of the PSFB dc-dc Circuit, a small additional resonant capacitor, and two additional diodes, is integrated at the secondary side of the PSFB dc-dc Circuit. With the clamp path of a hybrid-Switching Circuit, the voltage overshoots that arise during the turn off of the rectifier diodes are eliminated and the voltage of bridge rectifier is clamped to the minimal achievable value, which is equal to secondary-reflected input voltage of the transformer. The sum of the output voltage of LLC resonant Circuit and the resonant capacitor voltage of the hybrid-Switching Circuit is applied between the bridge rectifier and the output inductor of the PSFB dc-dc Circuit during the freewheeling phases. As a result, the primary-side circulating current of the PSFB dc-dc Circuit is instantly reset to zero, achieving minimized circulating losses. The effectiveness of the proposed converter was experimentally verified using a 4-kW prototype Circuit. The experimental results show 98.6% peak efficiency and high efficiency over wide load and output voltage ranges.
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Hybrid-Switching Full-Bridge DC–DC Converter With Minimal Voltage Stress of Bridge Rectifier, Reduced Circulating Losses, and Filter Requirement for Electric Vehicle Battery Chargers
IEEE Transactions on Power Electronics, 2013Co-Authors: Bin Gu, Nathan Kees, Jihsheng Lai, Cong ZhengAbstract:This paper first presents a hybrid-Switching step-down dc-dc converter, and then, by introducing transformer isolation, a novel hybrid-Switching phase-shift full-bridge dc-dc converter is derived for electric vehicle battery chargers. The proposed converter provides wide zero-voltage-Switching range in the leading-leg switches, achieves zero-current-Switching for lagging-leg switches, and uses a hybrid-Switching method to avoid freewheeling circulating losses in the primary side. Because the resonant capacitor voltage of the hybrid-Switching Circuit is applied between the bridge rectifier and the output inductor for the duration of the freewheeling intervals, a smaller sized output inductor can be utilized. With the current rectifier diode of the hybrid-Switching Circuit providing a clamping path, the voltage overshoots that arise during the turn-off of the rectifier diodes are eliminated and the voltage stress of bridge rectifier is clamped to the minimal achievable value, which is equal to secondary-reflected input voltage of the transformer. The inductive energy stored in the output inductor and the capacitive energy stored in the resonant capacitor of the hybrid-Switching Circuit are transferred to the output simultaneously during the freewheeling intervals with only one diode in series in the current path, achieving more effective and efficient energy transfer. The effectiveness of the proposed converter was experimentally verified using a 3.6-kW prototype Circuit designed for electric vehicle onboard chargers. Experimental results of the hardware prototype show that the converter achieves a peak efficiency of 98.1% and high system efficiencies over wide output voltage and power ranges.
Kongjun Zhu - One of the best experts on this subject based on the ideXlab platform.
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A low-power Circuit for piezoelectric vibration control by synchronized Switching on voltage sources
Sensors and Actuators A: Physical, 2010Co-Authors: Hui Shen, Jinhao Qiu, Kongjun Zhu, Marco Balsi, Ivan Giorgio, Francesco Dell'isolaAbstract:In the paper, a vibration damping system powered by harvested energy with implementation of the so-called SSDV (synchronized switch damping on voltage source) technique is designed and investigated. In the semi-passive approach, the piezoelectric element is intermittently switched from open-Circuit to specific impedance synchronously with the structural vibration. Due to this Switching procedure, a phase difference appears between the strain induced by vibration and the resulting voltage, thus creating energy dissipation. By supplying the energy collected from the piezoelectric materials to the Switching Circuit, a new low-power device using the SSDV technique is proposed. Compared with the original self-powered SSDI (synchronized switch damping on inductor), such a device can significantly improve its performance of vibration control. Its effectiveness in the single-mode resonant damping of a composite beam is validated by the experimental results.
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semi active vibration control of a composite beam by adaptive synchronized Switching on voltage sources based on lms algorithm
Journal of Intelligent Material Systems and Structures, 2009Co-Authors: Hongli Ji, Jinhao Qiu, Adrien Badel, Yuansheng Chen, Kongjun ZhuAbstract:In this article, an adaptive semi-active SSDV (Synchronized Switch Damping on Voltage) method based on the LMS algorithm is proposed and applied to the vibration control of a composite beam. In the SSDV method, the value of voltage source in the Switching Circuit is critical to its control performance. In the adaptive approach proposed in this study, the voltage source is adjusted adaptively using the LMS algorithm. Two cases of the adjustment are considered. In the first case, as an improvement to the enhanced SSDV, the voltage coefficient is adjusted by the LMS algorithm. In the second case, as an improvement to the classical SSDV, the voltage value is adjusted directly. The new adaptive approach is compared with the derivative-based adaptive SSDV proposed in the former study in the control of the first mode of a composite beam. The control results show that adaptive adjustment of voltage value and adaptive adjustment of voltage coefficient are equally effective in the vibration control of the composite...
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vibration control of a composite beam by an adaptive semi active method based on lms algorithm
Symposium on Piezoelectricity Acoustic Waves and Device Applications, 2008Co-Authors: Hongli Ji, Jinhao Qiu, Kongjun ZhuAbstract:In this paper, an adaptive semi-active SSDV (synchronized switch damping on voltage) method based on the LMS algorithm is proposed and applied to the vibration control of a composite beam. In the SSDV method, the value of voltage source in the Switching Circuit is critical to its control performance. In the adaptive approach proposed in this study, the voltage coefficient is adjusted adaptively using the LMS algorithm. The new adaptive approach is compared with the derivative-based adaptive SSDV proposed in the former study in the control of the first mode of a composite beam. The control results show that adaptive adjustment of voltage coefficient is effective in the vibration control of the composite beam and that LMS-based approach is slightly better than the derivative-based approach.
Cong Zheng - One of the best experts on this subject based on the ideXlab platform.
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Hybrid-Switching Full-Bridge DC–DC Converter With Minimal Voltage Stress of Bridge Rectifier, Reduced Circulating Losses, and Filter Requirement for Electric Vehicle Battery Chargers
IEEE Transactions on Power Electronics, 2013Co-Authors: Bin Gu, Nathan Kees, Jihsheng Lai, Cong ZhengAbstract:This paper first presents a hybrid-Switching step-down dc-dc converter, and then, by introducing transformer isolation, a novel hybrid-Switching phase-shift full-bridge dc-dc converter is derived for electric vehicle battery chargers. The proposed converter provides wide zero-voltage-Switching range in the leading-leg switches, achieves zero-current-Switching for lagging-leg switches, and uses a hybrid-Switching method to avoid freewheeling circulating losses in the primary side. Because the resonant capacitor voltage of the hybrid-Switching Circuit is applied between the bridge rectifier and the output inductor for the duration of the freewheeling intervals, a smaller sized output inductor can be utilized. With the current rectifier diode of the hybrid-Switching Circuit providing a clamping path, the voltage overshoots that arise during the turn-off of the rectifier diodes are eliminated and the voltage stress of bridge rectifier is clamped to the minimal achievable value, which is equal to secondary-reflected input voltage of the transformer. The inductive energy stored in the output inductor and the capacitive energy stored in the resonant capacitor of the hybrid-Switching Circuit are transferred to the output simultaneously during the freewheeling intervals with only one diode in series in the current path, achieving more effective and efficient energy transfer. The effectiveness of the proposed converter was experimentally verified using a 3.6-kW prototype Circuit designed for electric vehicle onboard chargers. Experimental results of the hardware prototype show that the converter achieves a peak efficiency of 98.1% and high system efficiencies over wide output voltage and power ranges.
Jinhao Qiu - One of the best experts on this subject based on the ideXlab platform.
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A low-power Circuit for piezoelectric vibration control by synchronized Switching on voltage sources
Sensors and Actuators A: Physical, 2010Co-Authors: Hui Shen, Jinhao Qiu, Kongjun Zhu, Marco Balsi, Ivan Giorgio, Francesco Dell'isolaAbstract:In the paper, a vibration damping system powered by harvested energy with implementation of the so-called SSDV (synchronized switch damping on voltage source) technique is designed and investigated. In the semi-passive approach, the piezoelectric element is intermittently switched from open-Circuit to specific impedance synchronously with the structural vibration. Due to this Switching procedure, a phase difference appears between the strain induced by vibration and the resulting voltage, thus creating energy dissipation. By supplying the energy collected from the piezoelectric materials to the Switching Circuit, a new low-power device using the SSDV technique is proposed. Compared with the original self-powered SSDI (synchronized switch damping on inductor), such a device can significantly improve its performance of vibration control. Its effectiveness in the single-mode resonant damping of a composite beam is validated by the experimental results.
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semi active vibration control of a composite beam by adaptive synchronized Switching on voltage sources based on lms algorithm
Journal of Intelligent Material Systems and Structures, 2009Co-Authors: Hongli Ji, Jinhao Qiu, Adrien Badel, Yuansheng Chen, Kongjun ZhuAbstract:In this article, an adaptive semi-active SSDV (Synchronized Switch Damping on Voltage) method based on the LMS algorithm is proposed and applied to the vibration control of a composite beam. In the SSDV method, the value of voltage source in the Switching Circuit is critical to its control performance. In the adaptive approach proposed in this study, the voltage source is adjusted adaptively using the LMS algorithm. Two cases of the adjustment are considered. In the first case, as an improvement to the enhanced SSDV, the voltage coefficient is adjusted by the LMS algorithm. In the second case, as an improvement to the classical SSDV, the voltage value is adjusted directly. The new adaptive approach is compared with the derivative-based adaptive SSDV proposed in the former study in the control of the first mode of a composite beam. The control results show that adaptive adjustment of voltage value and adaptive adjustment of voltage coefficient are equally effective in the vibration control of the composite...
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vibration control of a composite beam by an adaptive semi active method based on lms algorithm
Symposium on Piezoelectricity Acoustic Waves and Device Applications, 2008Co-Authors: Hongli Ji, Jinhao Qiu, Kongjun ZhuAbstract:In this paper, an adaptive semi-active SSDV (synchronized switch damping on voltage) method based on the LMS algorithm is proposed and applied to the vibration control of a composite beam. In the SSDV method, the value of voltage source in the Switching Circuit is critical to its control performance. In the adaptive approach proposed in this study, the voltage coefficient is adjusted adaptively using the LMS algorithm. The new adaptive approach is compared with the derivative-based adaptive SSDV proposed in the former study in the control of the first mode of a composite beam. The control results show that adaptive adjustment of voltage coefficient is effective in the vibration control of the composite beam and that LMS-based approach is slightly better than the derivative-based approach.
