共查询到18条相似文献，搜索用时 140 毫秒
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本文控制信号发生器的设计以AT89C51单片机最小系统配置总电路的核心,ICL8038CCPD的振荡电路组成的,拥有简单的线条,结构紧凑,性能优越等特点。 相似文献
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超声波发生器根据应用场合的不同,而要求有不同的电路设计方案,文章作者设计了一款应用于半导体焊线设备的超声波发生器的信号源电路,该电路采用英特矽尔公司生产的icl8038芯片,利用该芯片设计了一款高精度的波形发生器,通过选择不同电阻,电容等外部元器件,其设计的频率范围可以从0.001Hz到300KHz,并且也可以通过外部电压的扫描来产生不同频率的波形。文章作者用Proteus仿真软件对ICL8038芯片所设计的信号源电路进行了仿真。 相似文献
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本文根据当前就业形势及各高校加强学生动手能力培养的情况,探讨了虚拟仪器技术在高校实验教学中的应用前景,论述了构建虚拟实验室的方法;结合硬件和PC机.利用LabVIEW软件,设计了一个基于虚拟仪器技术多功能函数信号发生器.介绍了函数信号发生器的组建方法、前面板和程序设计、并给出了性能指标.结果表明.基于虚拟仪器技术的函数信号发生器完全可以满足高校实验教学的需要.虚拟仪器技术能够为高校改善实验条件提供一种新的、可行的途径. 相似文献
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采用大规模集成电路组成的 JDX型信号发生器 ,具有集成化程度高 ,电路简单 ,体积小 ,功能全 ,性能稳定等许多优点 ,是大专院校 ,科研院所最理想的常用电子仪器。它可输出三种 0 .1～ 1 0 0 KHz的正弦波 ,三角波和方波信号 ,仪器内的频率计还可外测1 0 MHz以下的信号 ,因此这种信号发生器具有多种功能。电路组成如下。该信号发生器由三部分组成 ,其框图如图 1所示。图 11 信号发生器1 .1 函数发生器 80 3 8的工作原理图 2 80 3 8函数发生器是一个大规模集成电路 ,整个电路由 52个晶体管 ,4个二极管和 48个电阻组成。这个电路内部的… 相似文献
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函数信号发生器在电路实验和设备检测中具有十分广泛的用途。本文以检定、校准函数信号发生器为基础,介绍了函数信号发生器在整个校准过程中不确定度的分析,以及评定计算的方法,为函数信号发生器建立计量最高标准,以及实验室的测试校准提供了参考依据。 相似文献
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根据信号发生器的工作原理及工作特点,设计一款超低频信号发生器,该信号发生器可输出自定义波形,如正弦波、三角波、方波和锯齿波及其他任意波形,详细介绍了任意波形的生成原理以及硬件电路设计原理等,此信号发生器输出的波形具有任意化及低频高精度的特点。 相似文献
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铂电阻智能测温电路设计及非线性校正方法 总被引：1，自引：0，他引：1
单片机因其高可靠性,高性价比被广泛应用于工业控制系统,智能化仪表和智能接口等领域。介绍以单片机为核心的铂电阻智能测温电路设计及非线性校正方法,主要分析了硬件的结构及其工作原理。该电路系统由温度采集电路,信号放大电路,模数转换模块ICL7135,89C51单片机,数码管显示电路及上位机组成。其具有数码管动态显示温度、上下限报警、打印与上位机通讯等功能。并通过分析铂电阻温度传感器的非线性特性,采用非线性A／D转换器7135实现线性补偿设计。 相似文献
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介绍了扩频信号产生器的设计方案和具体的硬件实现。方案基于FPGA和AD9779A芯片设计,结合FPGA和AD9779A二者的优点,采用软件工程化和模块化的设计方法。经实际工程验证表明,该系统稳定可靠,满足系统对不同扩频信号产生的设计需求。 相似文献
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本文介绍了基于FPGA技术,利用VHDL编程并加以简单的外围电路构成的数控移相正弦信号发生器。具体应用FPGA芯片及D/A转换器,采用直接数字频率合成技术(DDS),设计实现了一个频率、相位可控的正弦信号发生器。采用此方法设计的数控移相正弦信号发生器能够产生频率、相位均可数字式预置并可调节的两路正弦波信号,频率范围为20Hz至20kHz,相位差范围为0-359°,步进为1°。 相似文献
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In this paper, a novel approach for the design of an indirect adaptive fuzzy output tracking excitation control of power system generators is proposed. The method is developed based on the concept of differentially flat systems through which the nonlinear system can be written in canonical form. The flatness-based adaptive fuzzy control methodology is used to design the excitation control signal of a single machine power system in order to track a reference trajectory for the generator angle. The considered power system can be written in the canonical form and the resulting excitation control signal is shown to be nonlinear. In case of unknown power system parameters due to abnormalities, the nonlinear functions appearing in the control signal are approximated using adaptive fuzzy systems. Simulation results show that the proposed controller can enhance the transient stability of the power system under a three-phase to ground fault occurring near the generator terminals. 相似文献
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In this paper, we propose a new learning method for extracting bilingual word pairs from parallel corpora in various languages. In cross-language information retrieval, the system must deal with various languages. Therefore, automatic extraction of bilingual word pairs from parallel corpora with various languages is important. However, previous works based on statistical methods are insufficient because of the sparse data problem. Our learning method automatically acquires rules, which are effective to solve the sparse data problem, only from parallel corpora without any prior preparation of a bilingual resource (e.g., a bilingual dictionary, a machine translation system). We call this learning method Inductive Chain Learning (ICL). Moreover, the system using ICL can extract bilingual word pairs even from bilingual sentence pairs for which the grammatical structures of the source language differ from the grammatical structures of the target language because the acquired rules have the information to cope with the different word orders of source language and target language in local parts of bilingual sentence pairs. Evaluation experiments demonstrated that the recalls of systems based on several statistical approaches were improved through the use of ICL. 相似文献
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Signal generator based finite-time formation control for disturbed heterogeneous multi-agent systems
《Journal of The Franklin Institute》2022,359(2):1041-1061
This paper investigates finite-time formation control problems of heterogeneous multi-agent systems subject to mismatched and matched disturbances. The studied agents are modelled with both different orders and dimensions. To achieve the desired finite-time formation control goal, a novel signal generator based finite-time formation control scheme is proposed, which is composed of two parts. In the first part, a distributed finite-time signal generator is established to produce formation references for the agents in finite time. In the second part, based on finite-time observer technique and homogeneous systems theory, a kind of composite anti-disturbance controllers are constructed for the agents to track the formation references in finite time. In this way, the studied multi-agent system completes the desired finite-time formation control task. Compared with the existing results, the proposed control scheme solves the disturbed finite-time formation control problems with both different agents’ orders and dimensions, simplifies the formation controller design by using a modular design philosophy, and makes the agents have a plug and play feature. A simulation example is shown to validate the effectiveness of the proposed control scheme. 相似文献
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ICL7135是4位半双斜率积分型A/D转换器。文中介绍了它的主要特性及功能,给出了一种与单片机的中断查询的实用接口电路,同时举例说明用C语言编写的中断数据采集子程序。 相似文献