传统双向E型无线电能传输(wireless power transfer,WPT)拓扑易进入硬开关状态,导致电能传输效率低。针对此,该文提出无线电能传输系统的改进E^(#)型拓扑及其移相控制策略。首先,构建软开关状态负载范围更宽的双向E^(#)型WPT电路拓扑数...传统双向E型无线电能传输(wireless power transfer,WPT)拓扑易进入硬开关状态,导致电能传输效率低。针对此,该文提出无线电能传输系统的改进E^(#)型拓扑及其移相控制策略。首先,构建软开关状态负载范围更宽的双向E^(#)型WPT电路拓扑数学模型,分析并提取电路实现软开关工作状态的关键变量与约束条件,理论上证明所提拓扑的有效性。然后,推导电路中线圈互感和负载阻抗等参数的解析关系式,并基于此提出可保证系统在负载时始终处于最佳工作状态的移相控制策略。该策略通过控制开关管的门极驱动信号相位,使谐振元件内部储存的能量提前或者滞后释放,从而将开关管修正回软开关状态。最后,通过仿真和实验验证所提双向E^(#)型WPT系统的有效性。实验结果表明,所提方法可保证在5~30Ω的负载范围内电路工作在软开关状态,该范围内的电能传输效率峰值达84.3%。展开更多
Aqueous zinc metal batteries(AZMBs)have garnered widespread attention due to their low cost and high safety.However,current researches are still primarily focused on reversible cycling at low areal capacity,which is f...Aqueous zinc metal batteries(AZMBs)have garnered widespread attention due to their low cost and high safety.However,current researches are still primarily focused on reversible cycling at low areal capacity,which is far from practical application.Addressing interfacial stability issues encountered during cycling and employing interfacial optimization strategies can promote the development of safe and eco-friendly AZMBs.By introducingγ-valerolactone(GVL),which disrupts the original hydrogen bonding network of water,the electrochemical window of electrolyte is expanded,and the reactivity of water is significantly reduced.Additionally,the incorporation of GVL in Zn ion solvation alters the deposition pattern on the Zn anode surface,resulting in improved cyclic performance.The cells demonstrated excellent performance,maintaining stable over 400 h at 5 mA/cm^(2)-5 mA·h/cm^(2),and nearly 300 h in Zn||Zn symmetric cell at 80%depth of discharge(DOD).The full cells matched with NH_(4)V_(4)O_(10) could cycle over 200 cycles under the condition of high areal capacity(7 mA·h/cm^(2)),an N/P ratio of 1.99 and an E/C ratio of 9.3μL/(mA·h).展开更多
文摘传统双向E型无线电能传输(wireless power transfer,WPT)拓扑易进入硬开关状态,导致电能传输效率低。针对此,该文提出无线电能传输系统的改进E^(#)型拓扑及其移相控制策略。首先,构建软开关状态负载范围更宽的双向E^(#)型WPT电路拓扑数学模型,分析并提取电路实现软开关工作状态的关键变量与约束条件,理论上证明所提拓扑的有效性。然后,推导电路中线圈互感和负载阻抗等参数的解析关系式,并基于此提出可保证系统在负载时始终处于最佳工作状态的移相控制策略。该策略通过控制开关管的门极驱动信号相位,使谐振元件内部储存的能量提前或者滞后释放,从而将开关管修正回软开关状态。最后,通过仿真和实验验证所提双向E^(#)型WPT系统的有效性。实验结果表明,所提方法可保证在5~30Ω的负载范围内电路工作在软开关状态,该范围内的电能传输效率峰值达84.3%。
基金Project(2023YFC2908305)supported by the National Key R&D Program of ChinaProjects(52072411,52301273)supported by the National Natural Science Foundation of China+1 种基金Project(2023CXQD038)supported by the Central South University Innovation-Driven Research Program,ChinaProject(S202310533413)supported by the Fundamental Research Funds for the Central Universities of Central South University,China。
文摘Aqueous zinc metal batteries(AZMBs)have garnered widespread attention due to their low cost and high safety.However,current researches are still primarily focused on reversible cycling at low areal capacity,which is far from practical application.Addressing interfacial stability issues encountered during cycling and employing interfacial optimization strategies can promote the development of safe and eco-friendly AZMBs.By introducingγ-valerolactone(GVL),which disrupts the original hydrogen bonding network of water,the electrochemical window of electrolyte is expanded,and the reactivity of water is significantly reduced.Additionally,the incorporation of GVL in Zn ion solvation alters the deposition pattern on the Zn anode surface,resulting in improved cyclic performance.The cells demonstrated excellent performance,maintaining stable over 400 h at 5 mA/cm^(2)-5 mA·h/cm^(2),and nearly 300 h in Zn||Zn symmetric cell at 80%depth of discharge(DOD).The full cells matched with NH_(4)V_(4)O_(10) could cycle over 200 cycles under the condition of high areal capacity(7 mA·h/cm^(2)),an N/P ratio of 1.99 and an E/C ratio of 9.3μL/(mA·h).
