The Experts below are selected from a list of 175122 Experts worldwide ranked by ideXlab platform
Haifeng Fan - One of the best experts on this subject based on the ideXlab platform.
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a pwm plus Phase Shift control bidirectional dc dc converter
IEEE Transactions on Power Electronics, 2004Co-Authors: Chuanhong Zhao, Haifeng FanAbstract:A pulse-width modulation (PWM) plus Phase-Shift control bidirectional dc-dc converter is proposed. In this converter, PWM control and Phase-Shift control are combined to reduce current stress and conduction losses, and to expand ZVS range. The operation principle and analysis of the converter are explained, and ZVS condition is derived. A prototype of PWM plus Phase-Shift bidirectional dc-dc converter is built to verify the analysis.
Yufen Wang - One of the best experts on this subject based on the ideXlab platform.
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power characteristics analysis of bidirectional full bridge dc dc converter with triple Phase Shift control
Conference on Industrial Electronics and Applications, 2015Co-Authors: Hongjie Gu, Daozhuo Jiang, Rui Yin, Shuai Huang, Yiqiao Liang, Yufen WangAbstract:This paper analyzes the control performances of the triple-Phase-Shift (TPS) control and the operating mode of bidirectional full-bridge DC-DC converter under this control. Then the corresponding mathematical model of the converter is established and the related power characteristics are also analyzed. Moreover, the related formulas of the converter under TPS are derived for the convenience of comparative analysis between TPS control mode and dual-Phase-Shift (DPS) control mode. Then the paper points out that triple-Phase-Shift control not only retains the advantages of dual-Phase-Shift control, but also shows some other obvious advantages such as a small peak current and RMS current, low reactive power, and high efficiency, etc. At last, simulation base on matlab/simulink verify the excellent performance of the triple-Phase-Shift control.
Ziling Nie - One of the best experts on this subject based on the ideXlab platform.
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experimental comparison of traditional Phase Shift dual Phase Shift and model based control of isolated bidirectional dc dc converters
IEEE Transactions on Power Electronics, 2010Co-Authors: Hua Bai, Ziling NieAbstract:Three different control algorithms, traditional single-Phase-Shift control, dual-Phase-Shift control (DPSC), and model-based Phase-Shift control (MPSC), are implemented in a hardware setup and compared for a full-bridge-based isolated bidirectional dc-dc converter. The differences among their dynamic performance and steady-state operations are quantitatively analyzed. Experimental results showed good agreement with theoretical analysis. MPSC showed the best dynamic performance, while DPSC can eliminate reactive power under light-load conditions.
Chau Yuen - One of the best experts on this subject based on the ideXlab platform.
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intelligent reflecting surface practical Phase Shift model and beamforming optimization
IEEE Transactions on Communications, 2020Co-Authors: Samith Abeywickrama, Rui Zhang, Chau YuenAbstract:Intelligent reflecting surface (IRS) that enables the control of wireless propagation environment has recently emerged as a promising cost-effective technology for boosting the spectral and energy efficiency of future wireless communication systems. Prior works on IRS are mainly based on the ideal Phase Shift model assuming full signal reflection by each of its elements regardless of the Phase Shift, which, however, is practically difficult to realize. In contrast, we propose in this paper a practical Phase Shift model that captures the Phase-dependent amplitude variation in the element-wise reflection design. Based on the proposed model and considering an IRS-aided multiuser system with one IRS deployed to assist in the downlink communications from a multi-antenna access point (AP) to multiple single-antenna users, we formulate an optimization problem to minimize the total transmit power at the AP by jointly designing the AP transmit beamforming and the IRS reflect beamforming, subject to the users’ individual signal-to-interference-plus-noise ratio (SINR) constraints. Iterative algorithms are proposed to find suboptimal solutions to this problem efficiently by utilizing the alternating optimization (AO) as well as penalty-based optimization techniques. Moreover, to draw essential insight, we analyze the asymptotic performance loss of the IRS-aided system that employs practical Phase Shifters but assumes the ideal Phase Shift model for beamforming optimization, as the number of IRS elements goes to infinity. Simulation results unveil substantial performance gains achieved by the proposed beamforming optimization based on the practical Phase Shift model as compared to the conventional ideal model.
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intelligent reflecting surface practical Phase Shift model and beamforming optimization
International Conference on Communications, 2020Co-Authors: Samith Abeywickrama, Rui Zhang, Chau YuenAbstract:Intelligent reflecting surface (IRS) that enables the control of the wireless propagation environment has been looked upon as a promising technology for boosting the spectrum and energy efficiency in future wireless communication systems. Prior works on IRS are mainly based on the ideal Phase Shift model assuming the full signal reflection by each of the elements regardless of its Phase Shift, which, however, is practically difficult to realize. In contrast, we propose in this paper a practical Phase Shift model that captures the Phase-dependent amplitude variation in the element-wise reflection coefficient. Applying this new model to an IRS-aided wireless system, we formulate a problem to maximize its achievable rate by jointly optimizing the transmit beamforming and the IRS reflect beamforming. The formulated problem is non-convex and difficult to be optimally solved in general, for which we propose a low-complexity suboptimal solution based on the alternating optimization (AO) technique. Simulation results unveil a substantial performance gain achieved by the joint beamforming optimization based on the proposed Phase Shift model as compared to the conventional ideal model.
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intelligent reflecting surface practical Phase Shift model and beamforming optimization
arXiv: Signal Processing, 2019Co-Authors: Samith Abeywickrama, Rui Zhang, Chau YuenAbstract:Intelligent reflecting surface (IRS) that enables the control of wireless propagation environment has recently emerged as a promising cost-effective technology for boosting the spectrum and energy efficiency in future wireless communication systems. Prior works on IRS are mainly based on the ideal Phase Shift model assuming the full signal reflection by each of the elements regardless of its Phase Shift, which, however, is practically difficult to realize. In contrast, we propose in this paper the practical Phase Shift model that captures the Phase-dependent amplitude variation in the element-wise reflection coefficient. Based on the proposed model and considering an IRS-aided multiuser system with an IRS deployed to assist in the downlink communications from a multi-antenna access point (AP) to multiple single-antenna users, we formulate an optimization problem to minimize the total transmit power at the AP by jointly designing the AP transmit beamforming and the IRS reflect beamforming, subject to the users' individual signal-to-interference-plus-noise ratio (SINR) constraints. Iterative algorithms are proposed to find suboptimal solutions to this problem efficiently by utilizing the alternating optimization (AO) or penalty-based optimization technique. Moreover, we analyze the asymptotic performance loss of the IRS-aided system that employs practical Phase Shifters but assumes the ideal Phase Shift model for beamforming optimization, as the number of IRS elements goes to infinity. Simulation results unveil substantial performance gains achieved by the proposed beamforming optimization based on the practical Phase Shift model as compared to the conventional ideal model.
Chuanhong Zhao - One of the best experts on this subject based on the ideXlab platform.
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a pwm plus Phase Shift control bidirectional dc dc converter
IEEE Transactions on Power Electronics, 2004Co-Authors: Chuanhong Zhao, Haifeng FanAbstract:A pulse-width modulation (PWM) plus Phase-Shift control bidirectional dc-dc converter is proposed. In this converter, PWM control and Phase-Shift control are combined to reduce current stress and conduction losses, and to expand ZVS range. The operation principle and analysis of the converter are explained, and ZVS condition is derived. A prototype of PWM plus Phase-Shift bidirectional dc-dc converter is built to verify the analysis.
