共查询到20条相似文献，搜索用时 203 毫秒
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利用Ｋ．Ｐａｌ提出的改进式ＣＣⅡ系统地生成了电流模式ＣＣⅡ基本积木块电路．在此基础上,提出了电流模式三阶低通、高通跳耦滤波器的设计办法．计算机仿真结果表明设计电路完全正确．此法简单,可推广到更高阶的电流模式低通、高通有源滤波器的设计 相似文献
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虚拟仪器代表着目前测试仪器领域的发展方向,LabVIEW是一种功能强大的虚拟仪器开发平台.数字滤波技术是数字信号处理的一个重要组成部分,滤波器的设计是信号处理的核心问题之一.文章介绍了基于LabVIEW设计数字滤波器的方法,并给出了设计实例.在LabVIEW环境下可以随时对比设计要求调整参数,有利于数字滤波器设计的最优化,有效地克服了传统设计方式中存在的滤波器系数不易调整与硬件接口程序复杂、开发周期长等问题.LabVIEW为设计数字滤波器提供了一个可靠而有效的途径. 相似文献
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《内蒙古科技与经济》2016,(19)
在对光伏并网逆变器的工作原理、基本结构进行了分析的基础上,针对在网压不平衡情况下,其中对电流谐波分量及总谐波畸变率的规定相对严苛。然而,并网逆变器通常采用高频PWM的电流源控制,会导致并网电流中含有高次谐波。由于LCL滤波器较LC滤波器对高频谐波有更好的衰减特性,因此在光伏并网系统中得到广泛应用。同时,针对实际系统,运用软件对设计结果进行了仿真验证,仿真和实验结果表明:采用所提出的LCL滤波器的设计方法,光伏并网逆变器性能良好,从而验证了这种设计方法的正确性和合理性。 相似文献
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文章设计了一种基于CMOS第二代电流控制传输器(CCCIIs)实现的电调谐电流模式多功能滤波器。该滤波器电路仅由四个CCCIIs和两个接地电容组成。通过选择合适的输入和输出端,就能实现低通、高通、带通、带阻和全通五种滤波。此外,不需元件匹配条件,只需改变CCCIIs的直流偏置电流Ib,就可以独立调节滤波器的固有频率wo和品质因数Q,且具有较低的有源和无源灵敏度。采用TSMC0.18um CMOS工艺参数,进行Hspice仿真证实了所设计的电路是正确的。 相似文献
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定向滤波器是一个完全匹配的四端口器件,它有着类似滤波器的频率特性.波导型定向滤波器利用圆极化波导来实现信号的定向分配,本文介绍了它的原理及设计方法,给出了仿真实例. 相似文献
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本文提出了一种基于矢量原理的有源滤波器的滞环电流控制新方法.该方法以复平面为实施控制的矢量空间,根据电流误差矢量和参考电压矢量的空间分布对电压矢量进行最优化切换,使得电流误差控制在设定的滞环范围以内,改善滤波器性能.而且由于电压空间矢量的引入,使得其实现简单,能有效降低开关频率,改善电流跟踪性能.试验结果证明该方法的可行性. 相似文献
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研究了应用于电铁的单相有源电力滤波器,并分析了影响其性能的两个关键环节:谐波电流检测和补偿电流控制.用基于自适应原理的检测法检测出待补偿电流的指令值,并采用三角波调制电流控制方法,使逆变器产生出待补偿电流,来抵消因电铁牵引负荷的使用给电力系统带来的谐波影响.同时在MATLAB/SIMULINK的仿真软件下,建立了电铁牵引系统利用此滤波器进行谐波抑制的仿真模型,验证了方案的正确性和可行性. 相似文献
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针对电气化铁道的谐波与功率因数问题,提出了采用ip-iq谐波电流检测算法和滞环跟踪比较控制环节的并联有源电力数字滤波器,并对设计结果进行了仿真分析,验证了此方法的可靠性与实用性,具有良好的应用前景. 相似文献
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提出了一种具有独立输出端口的电流传送器二阶电流模滤波器的新电路，并由此得到了高通、带通和低通滤波特性．该电路具有敏感度较低和ＲＣ元件数较少的特点 相似文献
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提出了用改进式电流传送器实现二阶电流模式状态变量滤波器新电路，并由此得到了高通、带通、低通滤波特性。计算机仿真结果表明理论分析是正确的，所提电路具有灵敏度甚低的特点。 相似文献
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Mohd Amin Malik 《Journal of The Franklin Institute》2010,347(2):523-532
A new configuration realizing current/voltage-mode (CM/VM) universal filter using two four terminal floating nullors (FTFN) and four passive components is presented. The current-mode configuration has single input and three outputs and realises simultaneously lowpass (LP), bandpass (BP) and highpass (HP) responses from which allpass (AP) and notch functions can also be implemented. The voltage-mode filter has three inputs and two outputs and can be configured to realise all the five filtering functions. The circuit in current-mode uses grounded capacitors which are ideal for monolithic integration. Besides using a bare minimum number of passive components, the topology enjoys low active and passive sensitivity figures. Experimental and PSPICE simulation results are also included. 相似文献
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最少OTA元件的电控有源多功能滤波器 总被引：1，自引：0，他引：1
由有源RC状态变量滤波器导出了一个新的OTA有源滤波器.该电路可在单一结构的不同端点上同时获得低通、带通和高通滤波功能,且具有很好的电调谐能力.该电路具有低g_m参数变化灵敏度,此外,电路只需要四个OTA元件,这是实现KHN电路所需要的最少元件数. 相似文献
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提出了采用单四端浮点零器实现电流模式二阶全通／陷波和一阶全通滤波器新电路,该电路具有高输出阻抗和氏无源灵敏度特点。 相似文献
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This paper focuses on the problem of robust H∞ filter design for uncertain systems with time-varying state and distributed delays. System uncertainties are considered as norm-bounded time-varying parametric uncertainties. The delays are assumed to be time-varying delays being differentiable uniformly bounded with delay-derivative bounded by a constant, which may be greater than one. A new delay-derivative-dependent approach of filter design for the systems is proposed. A novel Lyapunov-Krasovskii functional (LKF) is employed, and a tighter upper bound of its derivative is obtained by employing an inequality and using free-weighting matrices technique, then the proposed result has advantages over some existing results, in that it has less conservatism and it enlarges the application scope. An improved sufficient condition for the existence of such a filter is established in terms of linear matrix inequality (LMI). Finally, illustrative examples are given to show the effectiveness and reduced conservatism of the proposed method. 相似文献
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提出了一种可以灵活配置共模反馈模块的伪差分结构跨导器.跨导器具有高线性度以及高输入动态范围,输入输出共模可以设置在同一电平,能方便用于滤波器级联设计.提出了一种频率控制方法,用于实现复数滤波器中心频率的自动调节.该频率调谐电路主要由基本数字电路和一个振荡器构成,与传统的锁相环结构相比,更加适合在低功耗应用场合.基于该方法,设计了一个3阶巴特沃斯Gm-C复数滤波器并采用Chrt35dg 2P4M CMOS工艺进行流片.试验结果表明,该滤波器能够达到足够的镜像抑制能力来满足IEEE802.15.4协议的要求. 相似文献
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This paper addresses the filtering problem for the one-sided Lipschitz nonlinear systems under measurement delays and disturbances using a generalized observer. A generalized architecture for filtering of the one-sided Lipschitz nonlinear systems with output delays is explored, which exhibits diverging manifolds, namely, the conventional static-gain filter and the dynamical filter, and can be employed to render robust stability of the filtering error dynamics. A matrix inequality based framework is obtained by employing a Lyapunov?Krasovskii (LK) functional, whose derivative is exploited through Jensen's inequality, one-sided Lipschitz condition, quadratic inner-boundedness inequality and range of the measurement delay, resulting into L2 stability for the filtering error system. Generalized filter design for the Lipschitz nonlinear systems with delayed outputs and specific results for the delay-dependent and delay-rate-independent filtering schemes for the one-sided Lipschitz nonlinear systems are deduced from the proposed approach. Convex optimization techniques are employed to achieve a solution for the nonlinear constraints through linear matrix inequalities by employing cone complementary linearization approach. Illustrative numerical examples to demonstrate the effectiveness of proposed method are provided. 相似文献
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This paper addresses the optimal controller problem for a linear system over linear observations with respect to different Bolza–Meyer criteria, where (1) the integral control and state energy terms are quadratic and the non-integral term is of the first degree or (2) the control energy term is quadratic and the state energy terms are of the first degree. The optimal solutions are obtained as sliding mode controllers, each consisting of a sliding mode filter and a sliding mode regulator, whereas the conventional feedback LQG controller fails to provide a causal solution. Performance of the obtained optimal controllers is verified in the illustrative example against the conventional LQG controller that is optimal for the quadratic Bolza–Meyer criterion. The simulation results confirm an advantage in favor of the designed sliding mode controllers. 相似文献
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This paper presents a second order sliding mode observer (SOSMO) design for discrete time uncertain linear multi-output system. The design procedure is effective for both matched and unmatched bounded uncertainties and/or disturbances. A second order sliding function and corresponding sliding manifold for discrete time system are defined similar to the lines of continuous time counterpart. A boundary layer concept is employed to avoid switching across the defined sliding manifold and the sliding trajectory is confined to a boundary layer once it converges to it. The condition for existence of convergent quasi-sliding mode (QSM) is derived. The observer estimation errors satisfying given stability conditions converge to an ultimate finite bound (within the specified boundary layer) with thickness O(T2) where T is the sampling period. A relation between sliding mode gain and boundary layer is established for the existence of second order discrete sliding motion. The design strategy is very simple to apply and is demonstrated for three examples with different class of disturbances (matched and unmatched) to show the effectiveness of the design. Simulation results to show the robustness with respect to the measurement noise are given for SOSMO and the performance is compared with pseudo-linear Kalman filter (PLKF). 相似文献