The Experts below are selected from a list of 4035 Experts worldwide ranked by ideXlab platform
Yunlong Shang - One of the best experts on this subject based on the ideXlab platform.
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A Switched-Coupling-Capacitor Equalizer for Series-Connected Battery Strings
IEEE Transactions on Power Electronics, 2017Co-Authors: Yunlong Shang, Fei Lu, Chenghui Zhang, Chunting Chris MiAbstract:Due to the low cost, small size, and easy control, the switched-Capacitor (SC) equalizer is promising among all types of active cell balancing methods. However, the balancing speed is generally slow and the balancing efficiency is seriously low when the SC equalizer is applied into a long battery string. Therefore, an automatic switched-Coupling-Capacitor equalizer (SCCE) is proposed, which can realize the any-cells-to-any-cells equalization for a battery string. Only two switches and one Capacitor are required for each battery cell. All mosfet s are controlled by one pair of complementary pulse width modulation signals, and energy can be automatically and directly delivered from any higher voltage cells to any lower voltage ones without the need of cell monitoring circuits, leading to a high balancing efficiency and speed independent of the cell number and the initial cell voltages. Contrary to the conventional equalizers using additional components for the equalization among modules, the proposed equalizer shares a single converter for the equalization among cells and modules, resulting in smaller size and lower cost. A prototype for four lithium battery cells is implemented, and an experimental comparison between the proposed SCCE and the conventional SC equalizer is presented. Experimental results show the proposed topology exhibits a substantially improved balancing performance, and the measured peak efficiency is 92.7%.
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A switched-Coupling-Capacitor equalizer for series-connected battery strings
2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017Co-Authors: Yunlong Shang, Chenghui Zhang, Bing Xia, Naxin CuiAbstract:An automatic switched-Coupling-Capacitor equalizer (SCCE) is proposed, which can realize the any-cells-to-any-cells equalization for a battery string. Only two switches and one Capacitor are needed for each battery cell. All MOSFETs are controlled by a pair of complementary PWM signals, and energy can be automatically and directly delivered from any higher voltage cells to any lower voltage ones without the need of monitoring circuits. The inherent advantages of the proposed system are the simple control, high efficiency, and easy modularization. A prototype for four lithium-ion battery cells is implemented, and a comparison between the proposed circuit and the conventional one is presented. Experimental results show the proposed circuit exhibits a substantially improved balancing performance, and the measured peak efficiency is about 92.7%.
Naxin Cui - One of the best experts on this subject based on the ideXlab platform.
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A switched-Coupling-Capacitor equalizer for series-connected battery strings
2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017Co-Authors: Yunlong Shang, Chenghui Zhang, Bing Xia, Naxin CuiAbstract:An automatic switched-Coupling-Capacitor equalizer (SCCE) is proposed, which can realize the any-cells-to-any-cells equalization for a battery string. Only two switches and one Capacitor are needed for each battery cell. All MOSFETs are controlled by a pair of complementary PWM signals, and energy can be automatically and directly delivered from any higher voltage cells to any lower voltage ones without the need of monitoring circuits. The inherent advantages of the proposed system are the simple control, high efficiency, and easy modularization. A prototype for four lithium-ion battery cells is implemented, and a comparison between the proposed circuit and the conventional one is presented. Experimental results show the proposed circuit exhibits a substantially improved balancing performance, and the measured peak efficiency is about 92.7%.
Chunting Chris Mi - One of the best experts on this subject based on the ideXlab platform.
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A Switched-Coupling-Capacitor Equalizer for Series-Connected Battery Strings
IEEE Transactions on Power Electronics, 2017Co-Authors: Yunlong Shang, Fei Lu, Chenghui Zhang, Chunting Chris MiAbstract:Due to the low cost, small size, and easy control, the switched-Capacitor (SC) equalizer is promising among all types of active cell balancing methods. However, the balancing speed is generally slow and the balancing efficiency is seriously low when the SC equalizer is applied into a long battery string. Therefore, an automatic switched-Coupling-Capacitor equalizer (SCCE) is proposed, which can realize the any-cells-to-any-cells equalization for a battery string. Only two switches and one Capacitor are required for each battery cell. All mosfet s are controlled by one pair of complementary pulse width modulation signals, and energy can be automatically and directly delivered from any higher voltage cells to any lower voltage ones without the need of cell monitoring circuits, leading to a high balancing efficiency and speed independent of the cell number and the initial cell voltages. Contrary to the conventional equalizers using additional components for the equalization among modules, the proposed equalizer shares a single converter for the equalization among cells and modules, resulting in smaller size and lower cost. A prototype for four lithium battery cells is implemented, and an experimental comparison between the proposed SCCE and the conventional SC equalizer is presented. Experimental results show the proposed topology exhibits a substantially improved balancing performance, and the measured peak efficiency is 92.7%.
Chenghui Zhang - One of the best experts on this subject based on the ideXlab platform.
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A Switched-Coupling-Capacitor Equalizer for Series-Connected Battery Strings
IEEE Transactions on Power Electronics, 2017Co-Authors: Yunlong Shang, Fei Lu, Chenghui Zhang, Chunting Chris MiAbstract:Due to the low cost, small size, and easy control, the switched-Capacitor (SC) equalizer is promising among all types of active cell balancing methods. However, the balancing speed is generally slow and the balancing efficiency is seriously low when the SC equalizer is applied into a long battery string. Therefore, an automatic switched-Coupling-Capacitor equalizer (SCCE) is proposed, which can realize the any-cells-to-any-cells equalization for a battery string. Only two switches and one Capacitor are required for each battery cell. All mosfet s are controlled by one pair of complementary pulse width modulation signals, and energy can be automatically and directly delivered from any higher voltage cells to any lower voltage ones without the need of cell monitoring circuits, leading to a high balancing efficiency and speed independent of the cell number and the initial cell voltages. Contrary to the conventional equalizers using additional components for the equalization among modules, the proposed equalizer shares a single converter for the equalization among cells and modules, resulting in smaller size and lower cost. A prototype for four lithium battery cells is implemented, and an experimental comparison between the proposed SCCE and the conventional SC equalizer is presented. Experimental results show the proposed topology exhibits a substantially improved balancing performance, and the measured peak efficiency is 92.7%.
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A switched-Coupling-Capacitor equalizer for series-connected battery strings
2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017Co-Authors: Yunlong Shang, Chenghui Zhang, Bing Xia, Naxin CuiAbstract:An automatic switched-Coupling-Capacitor equalizer (SCCE) is proposed, which can realize the any-cells-to-any-cells equalization for a battery string. Only two switches and one Capacitor are needed for each battery cell. All MOSFETs are controlled by a pair of complementary PWM signals, and energy can be automatically and directly delivered from any higher voltage cells to any lower voltage ones without the need of monitoring circuits. The inherent advantages of the proposed system are the simple control, high efficiency, and easy modularization. A prototype for four lithium-ion battery cells is implemented, and a comparison between the proposed circuit and the conventional one is presented. Experimental results show the proposed circuit exhibits a substantially improved balancing performance, and the measured peak efficiency is about 92.7%.
Mohamed Elmasry - One of the best experts on this subject based on the ideXlab platform.
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A Design-Oriented Soft Error Rate Variation Model Accounting for Both Die-to-Die and Within-Die Variations in Submicrometer CMOS SRAM Cells
IEEE Transactions on Circuits and Systems I: Regular Papers, 2010Co-Authors: Hassan Mostafa, Mohab Anis, Mohamed ElmasryAbstract:Submicrometer static random access memory cells are more susceptible to particle strike soft errors and increased statistical process variations, in advanced nanometer CMOS technologies. In this paper, analytical models for the critical charge variations accounting for both die-to-die and within-die variations are proposed. The derived models are verified and compared to Monte Carlo simulations by using industrial 65-nm CMOS technology. This paper provides new design insights such as the impact of the Coupling Capacitor, one of the most common soft error mitigation techniques, on the critical charge variability, especially, at lower supply voltages. It demonstrates that two extreme values of this Coupling Capacitor exist. The first value results in maximum relative variations and the other results in minimum relative variations. Therefore, the circuit designers can utilize these results to design the Coupling Capacitor to limit the variations under power and performance constraints in early design cycles. The derived analytical models account for the impact of the supply voltage and different particle strike conditions. These results are particularly important for soft error tolerant and variation tolerant designs in submicrometer technologies, especially, for low power operations.
