介观RLC电路零状态响应的线性时不变特性

采用代数动力学规范变换方法,求出含时变电压源的介观RLC电路量子态随时间演化算符的精确解,以及电荷、电流对输入电压信号的零状态响应,结果表明介观RLC电路系统具有线性时不变特性,且电荷与电流的零状态响应与宏观RLC电路的结果相同.     

一般线性网络的混合分析法

本文应用网络图论提出了圈-离集混合基矩阵的概念、混合基中基尔霍夫定律的矩阵表示和一般线性网络的混合基方程,进而建立了一般线性网络的圈电流-离集电压混合分析法。这个方法把文献[4]关于无源和无互感网络的混合分析法推广到包括有源和有互感网络在内的一般的线性时不变集总参数网络的情况。     

一种1.2V,80mA,5μF快速瞬态响应、高稳定性LDO的设计

基于上华0.5μm工艺,设计了输入电压为1.5V,输出电压为1.2V,最大输出电流为80mA,用于DC/DC里的CMOS低压差线性稳压器(Low-dropout regulator),作为带隙基准输出端的后续模块,以达到滤波和提高参考电压精度的目的。提出了一种补偿网络,可以保证负载电流发生变化时,相位裕量不发生变化;在补偿网络的基础上添加一个感应电容能够快速跟踪极点的变化,从而保证在负载电流跳变瞬间稳定性保持不变,防止了输出电压发生振荡的情形。此外,设计了一种瞬态响应提高电路结构来改善负载瞬态响应。仿真结果表明,在tt corner下该LDO线性稳压器在负载电流为1mA和80mA时的相位裕度均为83°,环路增益为80dB,流片测试结果显示过冲电压和欠冲电压均不超过100mV。     

一种恒流源电路及其在仪表中的应用

一种恒流源电路及其在仪表中的应用马志刚（武汉热工仪表厂．汉口．４３００１０）电压一电流变换器能将输入电压信号变换成与之成比例的输出电流信号。在一定的负载范围内，如果输入电压恒定不变，则输出电流也恒定不变，此时的电压一电流变换器就是恒流源电路。电压一电...     

应用于低温多晶硅薄膜晶体管液晶显示器之新型互补电流镜式模拟缓冲放大器

取代传统运算放大器和临界电压补偿型模拟缓冲器,提出了一种新型的互补式电流镜模拟缓冲器,可以利用在低温多晶硅薄膜晶体管液晶显示器驱动电路上.使用 N 型电流镜和 P 型电流镜来交互使用以达到较大的电压输出范围,并且使用一开关控制电路实时控制切换,所以可以提出的电压缓冲器不需要电容或时脉讯号就可以运作,这样可以节省很多布局时所需要的面积,且依然维持良好的线性趋势.     

由正弦电路的阻抗引发的思考

以容抗为例回顾了电抗的定义与实质,指出了容抗与电阻不同,容抗是电容的电压与电流的有效值（或幅值）之比,而不是电压与电流的瞬时值之比。文章着重指出了在激励频率为定值时,给定电容的容抗为常数,而其u（t）／i（t）却是时间的正切函数。该文指出了电阻与电抗、阻抗的区别,对正确理解和使用阻抗有帮助。     

唯一解置换判据

在置换定理的讨论中,经常遇到的问题就是置换后电路的解是否仍然唯一。为了在应用置换定理求解电路之前就可获得电路解唯一的信息,这里提出了唯一解置换的三条判据。一、置换定理置换定理适用于线性,非线性,时变,时不变的集总参数电路。定理如下:假设含有若干个独立电源的任意网络,其支路电压和支路电源有唯一解,当第k条支路(与其它支路无任何耦合)的电压U_k和电流I_k为已知时,可用一电压等于U_k的独立电压源或电流等于I_k的     

关于电容电压和电感电流跃变的讨论

本文针对电路教科书指出的有两种情况可能会出现冲激电流和冲激电压的情况,通过举例说明,电容电压和电感电流的跃变可以在多种情况下发生。笔者还讨论了电容电压和电感电流跃变与换路定律之间的关系,即电容电压和电感电流跃变是对实际电路理想化建模的结果。本文通过实例指出正确理解电容电压和电感电流的跃变,有助于简化电路的分析。     

非线性时变互感的瞬态电路模型

基于电路理论和数值积分的原理，导出了非线性时变互感关于Ｂａｃｋｗａｒｄ Ｅｕｌｅｒ和Ｎｅｗｔｏｎ－Ｒａｐｈｓｏｎ算法的瞬态电路模型，将文献［１］中提出的非线性时变ＲＬＣ电路瞬态分析的方法推广到含非线性时变互感的情况，使非线性时变ＲＬＣＭ电路的瞬态分析简化为若干线性时不变电阻性电路的直流分析。     

几种电流型AMOLED像素电路及其电流缩放比的分析

分析了4种典型的电流型AM OLED像素驱动电路的工作原理,从中总结出了补偿阈值电压漂移的方法--自动调节存储电容的电压以保证电流不变.着重提出了电流缩放比的定义,对传统结构、电流镜结构、分压结构和电容耦合结构这4种电流型AM OLED像素驱动电路的电流缩放比进行了比较和分析.在这4种电路中,电流缩放比依次增大,显示出电流型像素电路在解决电容充电时间问题上的进步与完善.     

可集成互感耦合电路的实现

在分析互感耦合电路端口电压和电流关系的基础上提出了一种新的互感耦合电路的系统设计方法,并以CCCII和CCDDCC为有源器件实现了具体电路。提出的电路仅有4个有源器件,2个接地电容和2个接地电阻,能够实现初、次级电感L1,L2和互感M(或-M)。初、次级电感和互感能够通过调节有源器件CCDDCC的偏置电流和电阻RM实现独立可调。作为应用和验证设计的正确性,将提出的互感耦合电路应用到双调谐回路。     

Analysis of harmonic generator circuits for step recovery diodes

This paper gives formulas for the transients in a simple lossless harmonic generator circuit consisting of a step recovery diode, two inductors, and two capacitors. By means of graphic plots of the instantaneous values of currents and voltages, it is concluded that high efficiency requires approximately equal values of the two inductors.     

时变RLC网络的瞬态数值分析

本文提出了一种时变RLC网络的数值分析方法,它首先把支路电压的步进变化量作为待求变量,然后以此可很方便地求出网络中各支路的电压及电流。并且可适当地控制步长h以获得满意的计算精度。本方法能够直接反映出时变RLC网络的实际物理变化进程。计算机编程极其容易。在长城0520CH机上进行实例计算表明:此方法是一种既直观、方便又切实可行的方法。     

Transmission-line theory approach to solution of state equationsfor linear-lumped circuits

Linear-lumped circuits containing capacitors and/or inductors are described by differential equations. In computer-aided circuit analysis, these equations are discretized in time, thus being reduced to approximate formulas involving samples of voltages and currents. It is shown that these relations can be interpreted as exact equations for networks containing transmission lines. Hence, some features of the approximate formulas gain a clear physical interpretation. In particular, convergence and energy balance properties of the formulas become obvious, confirming advantages of the trapezoidal rule over all other formulas     

基于二极管的限幅蔡氏电路实验研究

根据经典蔡氏电路的数学模型,获得系统各个变量之间的运算关系,利用运算放大器、电阻、电容及二极管等元器件,完成非线性限幅函数的电路设计,实现无电感元件的等效蔡氏电路硬件实验图。结果表明,通过调试电路中电阻值,可以直接从示波器观测到蔡氏电路的三个运动变量,包括周期、单涡卷、双涡卷等运动行为的时序图和相位图。搭建的电路结构简单,学生实验时调试容易,并且由于电路中不含电感元件,实验过程中混沌吸引子的稳定性也明显得到了提高。     

Three-Phase Rectifier With Near Sinusoidal Input Currents and Capacitors Connected on the AC Side

An analysis of a three-phase low-harmonic diode rectifier equipped with inductors, capacitors connected on the ac side, and diodes is presented. Inductors and capacitors are used in conjunction with the three-phase diode bridge rectifier to improve the waveform of the currents drawn from the utility grid. The operation of the proposed converter is analyzed, and on this basis, design considerations are commented. The converter characteristics are determined as a function of the load current. Comparisons between the studied converter and other rectifiers (classical rectifiers with passive or active filters, three-phase rectifiers with near sinusoidal input currents and capacitors connected on the dc side, and three-phase low-harmonic rectifiers applying the third harmonic current injection) are also presented. Several possible applications of the two variants of the three-phase rectifiers with near sinusoidal input currents (with capacitors connected on the dc side or on the ac side) are mentioned. Analytically derived results are experimentally verified     

Illumination d’un réseau de lignes ou de câbles par une onde de foudre Modélisation par des générateurs de courant

In this paper we propose a new formalism for the analysis of electromagnetic coupling between the lightning wave and a network of lines or cables. This approach allows obtaining currents and induced voltages directly on the set of lines or cables extremities. For this objective we use the current generators representation of the lightning wave. Then by a mathematical formulation based on the topological analysis of the network, we deduce a linear equation system which resolution leads directly to the currents and induced voltages. In order to confirm our theoretical work, we present a set of applications that allows validating this formalism.     

Single-phase to three-phase power conversion interface

This study proposes a single-phase to three-phase power conversion interface which converts the power from a single-phase utility to three-phase power for a three-phase load. The proposed single-phase to three-phase power conversion interface comprises a bridge-type switch set, a set of three-phase inductors, a transformer set and a set of three-phase capacitors. A current-mode control controls the switching of bridge-type switch set, to generate a set of nonzero-sequence (NZS) currents and a set of zero-sequence (ZS) currents. The transformer set is used to decouple the NZS currents and the ZS currents. The NZS currents are used to generate a high-quality three-phase voltage that supplies power to a three-phase load. The ZS currents flow to the single-phase utility so that the utility current is sinusoidal and in phase with the utility voltage. Accordingly, only a bridge-type switch set is used in the single-phase to three-phase power conversion interface to simply the power circuit. A prototype is developed and tested to verify the performance of the proposed single-phase to three-phase power conversion interface.     

An analysis of three-phase rectifiers with near-sinusoidal input currents

An analysis of a three-phase low-harmonic diode rectifier equipped with inductors, capacitors, and diodes is presented. Inductors and capacitors are used in conjunction with the three-phase diode rectifier bridge to improve the waveform of the currents drawn from the utility grid. The operation of the proposed converter is analyzed and, on this basis, design considerations are commented upon. The converter characteristics are determined as a function of the load current. Comparisons between the studied converter and other rectifiers (classical rectifiers, with passive or active filters, and three-phase low-harmonic rectifiers applying the third-harmonic current injection) are also presented. Several possible applications of the three-phase rectifiers with near-sinusoidal input currents are mentioned. Analytically obtained results are experimentally verified.     

求解线性集总参数电路的变分方法

变分原理在电磁场有限元计算中已获广泛应用,本文讨论如何将该原理应用于线性集总参数电路的求解中。笔者从特勒根定理出发,导出了基于节点电压和圊路电流的功率泛函,给出了通过变分获得电路解答的方法和步骤,借助功率泛函的概念,指出了电路解答与电路系统的功率最小点或者功率驻定点相对应。数值算例验证了这一结论。本文目的是提供一个清晰的视角理解线性集总参数电路求解的物理本质。同时,集总参数电路的泛函是求解电磁场一电路耦合问题的桥梁之一。