为解决传统均衡电拓扑均衡效率较低的问题,文中提出了一种两级均衡拓扑结构。该均衡拓扑将电池组分为组内与组间两种形式,组内采用Buck-Boost均衡电路,组间采用可重构均衡电路,组内与组间可同时均衡,提高了均衡效率。以SOC(State of Cha...为解决传统均衡电拓扑均衡效率较低的问题,文中提出了一种两级均衡拓扑结构。该均衡拓扑将电池组分为组内与组间两种形式,组内采用Buck-Boost均衡电路,组间采用可重构均衡电路,组内与组间可同时均衡,提高了均衡效率。以SOC(State of Charge)作为均衡变量,组内均衡算法采用基于SOC的模糊逻辑控制策略,减少均衡时间,提高均衡效率。使用MATLAB/Simulink软件对电路拓扑建模仿真,并与传统Buck-Boost电路进行对比。仿真结果表明,在充放电状态下,相较于传统Buck-Boost电路,所提算法及均衡拓扑使均衡时间减少了约28%,表明该均衡电路及算法具有良好的性能。展开更多
基于采样速率最快的全并行(Flash)ADC(Analog to Digital Converter)结构,采用UMC 0.18 um CMOS工艺,设计了一种具有失调对消的采样保持电路(Track-and-Hold Circuit)。该THC嵌入比较器的两级预放大电路之中,不仅可以简化ADC结构,还进...基于采样速率最快的全并行(Flash)ADC(Analog to Digital Converter)结构,采用UMC 0.18 um CMOS工艺,设计了一种具有失调对消的采样保持电路(Track-and-Hold Circuit)。该THC嵌入比较器的两级预放大电路之中,不仅可以简化ADC结构,还进一步提高了比较器速度。通过电路工作相位ф_1,ф_2交替变换,不同相位的失调分量等值反向,输出累加实现对比较器失调对消。最后,在2 GHz时钟频率下进行仿真,仿真结果表明,输入信号为800MHz时,具有失调对消THC的Flash ADC较传统结构的SFDR(Spurious Free Dynamic Range),SINAD(Signal to Noise And Distortion)分别提高了8.26 dB、3.14 dB,ENOB(Effective Number Of Bits)提高了0.52 bits。展开更多
为了充分发挥仿真实验和实物操作实验教学手段的优势,尝试将NI Multisim仿真软件和NI ELVIS II+实验平台引入模拟电子技术实验的教学中,并以晶体管两级放大电路实验为例设计了基于仿真和实物操作一体化的模拟电子技术实验系统。实践表明...为了充分发挥仿真实验和实物操作实验教学手段的优势,尝试将NI Multisim仿真软件和NI ELVIS II+实验平台引入模拟电子技术实验的教学中,并以晶体管两级放大电路实验为例设计了基于仿真和实物操作一体化的模拟电子技术实验系统。实践表明,将仿真实验和实物操作实验实时结合起来,学生可以快速地将仿真实验的结果与实物操作实验的结果进行分析比对,大大缩减了从仿真电路设计到实物电路实现的过程,从而有效地提高了学生的实验效率和学习成就感。展开更多
The dynamic performance and the stability are essential for a system. A new circuit topology used for electrical discharge machining (EDM) power and made up of complex-pulse (voltage-pulse and current-pulse) is presen...The dynamic performance and the stability are essential for a system. A new circuit topology used for electrical discharge machining (EDM) power and made up of complex-pulse (voltage-pulse and current-pulse) is presented. The large-signal model of it is also derived. Based on the comprehensive analysis of the system model, the compensator is designed to make the system match better and to improve its dynamic performance and the stability under perturbations. Finally, the design methods and the analysis are verified by simulation and experimental results.展开更多
We propose a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by consid- ering N superconducting charge qubits （or artificial two-level atoms） interacting with ...We propose a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by consid- ering N superconducting charge qubits （or artificial two-level atoms） interacting with photons in a high finesse cavity on a chip, assisted by a strong driving field. By virtue of the parameters of this system, we can generate novel quantum states, for example, multiparty entangled states and Schr6dinger cat states among the superconducting qubits, coherent states and squeezed states of the cavity. These states, whose amplitudes are about two orders greater than those from the atomic quantum electrodynamics in classical cavity, are important for understanding the boundary between quantum and classical behavior and can be utilized in experimental studies on decoherence. This device may be an architecture for future solid-state quantum computation and communication.展开更多
文摘为解决传统均衡电拓扑均衡效率较低的问题,文中提出了一种两级均衡拓扑结构。该均衡拓扑将电池组分为组内与组间两种形式,组内采用Buck-Boost均衡电路,组间采用可重构均衡电路,组内与组间可同时均衡,提高了均衡效率。以SOC(State of Charge)作为均衡变量,组内均衡算法采用基于SOC的模糊逻辑控制策略,减少均衡时间,提高均衡效率。使用MATLAB/Simulink软件对电路拓扑建模仿真,并与传统Buck-Boost电路进行对比。仿真结果表明,在充放电状态下,相较于传统Buck-Boost电路,所提算法及均衡拓扑使均衡时间减少了约28%,表明该均衡电路及算法具有良好的性能。
文摘提出了一种适用于射频—微机电系统(RF-MEMS)滤波器的高性能接口放大电路。利用微纳工艺制备了相对带宽为1.4%、中心频率为73.02 MHz的硅基MEMS滤波器,针对其高阻抗、高插入损耗特性,设计了基于运算放大器的低噪声、高增益的两级放大电路和阻抗匹配电路。仿真结果表明:接口电路对高频的MEMS滤波器微弱电流信号具有良好的放大效果,增益可达62.75d B,噪声系数为3.35d B,S22反射系数为-46.91 d B,使RF-MEMS滤波器的插入损耗降低至0.56 d B。测试与PCB板级电路级联的MEMS滤波器输出信号表明:RF-MEMS滤波器的插入损耗降至16.2d B,相对带宽为1.4%,中心频率为73.02 MHz,提升了MEMS滤波器在无线通信中的应用潜力。
文摘基于采样速率最快的全并行(Flash)ADC(Analog to Digital Converter)结构,采用UMC 0.18 um CMOS工艺,设计了一种具有失调对消的采样保持电路(Track-and-Hold Circuit)。该THC嵌入比较器的两级预放大电路之中,不仅可以简化ADC结构,还进一步提高了比较器速度。通过电路工作相位ф_1,ф_2交替变换,不同相位的失调分量等值反向,输出累加实现对比较器失调对消。最后,在2 GHz时钟频率下进行仿真,仿真结果表明,输入信号为800MHz时,具有失调对消THC的Flash ADC较传统结构的SFDR(Spurious Free Dynamic Range),SINAD(Signal to Noise And Distortion)分别提高了8.26 dB、3.14 dB,ENOB(Effective Number Of Bits)提高了0.52 bits。
文摘为了充分发挥仿真实验和实物操作实验教学手段的优势,尝试将NI Multisim仿真软件和NI ELVIS II+实验平台引入模拟电子技术实验的教学中,并以晶体管两级放大电路实验为例设计了基于仿真和实物操作一体化的模拟电子技术实验系统。实践表明,将仿真实验和实物操作实验实时结合起来,学生可以快速地将仿真实验的结果与实物操作实验的结果进行分析比对,大大缩减了从仿真电路设计到实物电路实现的过程,从而有效地提高了学生的实验效率和学习成就感。
文摘The dynamic performance and the stability are essential for a system. A new circuit topology used for electrical discharge machining (EDM) power and made up of complex-pulse (voltage-pulse and current-pulse) is presented. The large-signal model of it is also derived. Based on the comprehensive analysis of the system model, the compensator is designed to make the system match better and to improve its dynamic performance and the stability under perturbations. Finally, the design methods and the analysis are verified by simulation and experimental results.
基金supported by the National Natural Science Foundation ofChina (Grant Nos. 11074070, 10774042, 10874235, 10934010, 60978019,10775176, 60525417, and 10774163)the Natural Science Foundation ofHunan Province (Grant No. 09JJ3121)+1 种基金the Key Project of Science andTechnology of Hunan Province (Grant No. 2010FJ2005)the NKBRSFC(Grants Nos. 2006CB921400, 2009CB930704 and 2010CB922904)
文摘We propose a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by consid- ering N superconducting charge qubits （or artificial two-level atoms） interacting with photons in a high finesse cavity on a chip, assisted by a strong driving field. By virtue of the parameters of this system, we can generate novel quantum states, for example, multiparty entangled states and Schr6dinger cat states among the superconducting qubits, coherent states and squeezed states of the cavity. These states, whose amplitudes are about two orders greater than those from the atomic quantum electrodynamics in classical cavity, are important for understanding the boundary between quantum and classical behavior and can be utilized in experimental studies on decoherence. This device may be an architecture for future solid-state quantum computation and communication.
