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为帮助学生理解虚拟仪器的构成与应用原理,培养实践能力,本院开发了电机转速虚拟测试平台.该平台以现有THVZ-1实验装置的硬件和软件为基础,集成运用传感器技术、采集卡接口技术和Visual Basic软件开发平台实现了电机转速信号的动态显示和测量.实际教学表明,学生通过参与该平台的开发,提高了学习兴趣和综合应用能力. 相似文献
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本文介绍了基于霍尔传感器,采用单片机C8051F060控制的直流电机转速测量控制系统的工作原理及软硬件设计方法.通过7279实现在LED上直观地显示电机的转速值.此外,还可以根据需要调整控制电机的转速.测试结果表明,该转速测量系统满足设计要求,并且具有硬件结构简单,性价比较高,易于调节电机转速及系统性能稳定等优点. 相似文献
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以非接触式的电机转速测量方法为核心,基于虚拟仪器和LabVIEW设计了一种感应电机测试系统.该系统实现了同步、实时监测电机的转速、三相电压和三相电流等多路信号,并对采得的信号可实现实时存储、动态回放和分析处理以及图形打印等功能.通过部分试验测试表明了系统的功能和特点. 相似文献
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在生产过程中,电机的应用十分广泛,随着生产的不断发展,对电机转速的测量就显得十分必要,同时对电机转速的测量提出了更高的要求。本文设计了一种以51单片机作为主控制器,使用霍尔传感器进行测量的直流电机转速测量系统。完成了系统的实物搭接,且调试成功,满足设计要求。本系统采用集成霍尔传感器敏感速率信号,具有频率响应快,抗干扰能力强等特点。 相似文献
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模拟视频信号解码既是视频应用的重要部分,又是后级数字信号处理的基础。为了适应于便携式设备的发展,研究了一种以TI公司的视频解码芯片TVP5150为核心、MSP430F2013单片机为控制器件的低功耗视频解码模块。单片机控制TVP5150的I^2C总线以及与PC机的串口通信。文中主要阐述了系统硬件设计、PC机与单片机通信软件设计(包括PC机部分和单片机部分)、单片机I^2C总线控制软件设计以及模块输出信号的说明等。本模块的模拟视频信号解码为符合ITU-R BT656标准的数字YCbCr信号,具有良好的应用前景。 相似文献
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《Microwave Theory and Techniques》1986,34(4):436-441
A novel analog frequency divider which can generate a 1/4 frequency component is proposed. The frequency divider consists of a dual-gate FET and a two-stage capacitor-resistor coupled amplifier. This circuit configuration also enables achieving a small-size GaAs MMIC analog frequency divider. In this analog frequency divider, the input signal f/sub 0/ is mixed with signal component f/sub 0//x caused by noise or transients in a feedback loop. Then, a (1 -- 1/x)f/sub 0/ IF component is induced and is again mixed with the input signal. This process delivers the f/sub 0//x component regeneratively. Resultant continuous signal components f/sub 0//x and (1-1/x)f/sub 0/ have a harmonic relation when the system reaches a steady state. The f/sub 0//x component can be mainly obtained at an output port of the frequency divider. The operation band was simulated using a SPICE II computer program. The designed bandwidth and conversion gain for the 1/4 frequency divider are 8.5-10.6 GHz and -3 dB, respectively. Based on the simulation, a GaAs monolithic analog 1/4 frequency divider was made and tested. The developed 1/4 frequency divider provides a 8.5-10.2-GHz operation bandwidth and --5+-1-dB conversion gain. The designed and experimental values are in good agreement. The frequency division band can be shifted to higher frequency (10.65-11.2 GHz) by adopting the external matching circuit at the GaAs chip output port. The proposed analog frequency divider circuit can be applied not only for 1/4 frequency division, but also for 1/n frequency division (interger n > 2). 相似文献
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提出了一种基于myDAQ的PWM远程控制直流电机调速与测量系统。采用LabVIEW开发平台,在上位机用图形化编程语言编制PWM控制信号,并通过myDAQ的模拟输出口将PWM信号送给直流电机驱动控制电路实现电机的调速,同时上位机启动、停止、转向等控制信号也通过myDAQ数字输出口送给驱动电路进而实现电机的起、停、转向控制。电机转速通过编码器测量并送至上位机,在上位机将会实时跟踪与显示电机运行状态以及PWM控制信号波形,利用LabVIEW的WEB发布技术将前面板发布至网络上进而实现运程控制。通过测试及分析,结果显示整个系统运行良好、稳定、实时性强。 相似文献
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In part 4 of the series (Schmalzel and Rauth, 2005), the signal conditioning stage for a variety of transducer types and sensors was discussed. The output of this stage in the measurement chain is typically an analog signal that can drive an actuator or display or be converted into digital form. Since the advent of monolithic analog/digital converters (ADCs) in the 1970s, digital measurement systems have become the standard. Today, almost all signal processing takes place in the digital domain where signals can be flexibly manipulated in complex ways when compared to their analog counterparts. Before we can enter the Utopian realm of digital signal processing, analog signals need to be converted into digital form, which is the subject of this tutorial. 相似文献
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This paper presents a solution for controlling integrated DC–DC converters with high switching frequency (>20 MHz). The increase of the switching frequency is a trend biased by output filter volume restrictions and integration demand. The control of DC–DC converters operating at high frequency presents an opportunity to speed up the converter response time but also a challenge specially for the control solution, quiescent current and to limit the sensitivity to process and operating conditions for the mixed signal circuits involved. The solution presented in this work relies on separating the duty-cycle into three parts: a load-free value that depends only on the input and output voltages, a transient fast correction contribution, and an accurate compensation for the IR drop that depends on the load current. The load-free portion of the duty-cycle has a compensation of PVT variations and the fast transient part of the duty-cycle uses a non-linear sliding mode control solution. All the analog blocks required for the implementation of the proposed solution are detailed. 相似文献
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基于HOP的可调光编码/解码器的研究 总被引:1,自引:0,他引:1
提出了一种基于全息光处理器的可调光编码/解码器的实现方案。全息光处理器可以在空间进行编/解码,每个通信网络单元可以采用任意速率的数字或模拟的调制信号,它非常适合于多媒体的通信网络环境,通过对全息光处理器的折射率大小和位置的控制,当一个输入光脉冲经过光处理器中具有特定折射率的空间位置后,便可在处理器的输出端口得到合适的输出信号。本文给出了这种基于全息光处理器的可调光编码/解码器的仿真实验,结果是可行的,与以前文献中提出的结构相比,减小了硬件实现的复杂性,降低了成本和功耗,便于集成。 相似文献