本系统采用电动机电枢供电回路串接采样电阻的方式来实现对小型直流有刷电动机的转速测量。该系统主要由二阶低通滤波电路,小信号放大电路、单片机测量显示电路、开关稳压电源电路等组成。同时自制电机测速装置,用高频磁环作为载体,用线圈绕制磁环,利用电磁感应原理检测电机运行时的漏磁,将变化的磁场信号转化为磁环上的感应电流。用信号处理单元电路将微弱电信号转化为脉冲信号,送由单片机检测,从而达到准确测量电机的速度的要求。In this system, the sampling resistance of armature power supply circuit is connected in series to measure the speed of small DC brush motor. The system is mainly composed of second-order low-pass filter circuit, small signal amplifier circuit, single-chip measurement and display circuit, switching regulated power supply circuit and so on. At the same time, the self-made motor speed measuring device uses high frequency magnetic ring as the carrier, coil winding magnetic ring, and electromagnetic induction principle to detect the leakage of magnetic field during the operation of the motor, which converts the changed magnetic field signal into the induced current on the magnetic ring. The weak electric signal is transformed into pulse signal by signal processing unit circuit, which is sent to single chip computer for detection, so as to meet the requirement of accurate measurement of motor speed.
标签： 直流电动机
上传时间： 2022-03-26
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在半导体制冷技术的工作性能及其优缺点研究的基础上,设计了以单片机为核心控制元件,以TEC1-12706为执行元件的半导体制冷温度控制系统。采用高精度分段式PID控制算法配合PWM输出控制的方法实现温度控制;选择数字传感器DS18B20为温度检测元件,还包含1602液晶显示模块、按键调整输入模块和H桥驱动模块等。实际测试表明,该系统结构简单易行,操作方便,工作性能优良,同时针对该系统专门设计的温控算法,使半导体制冷器能更好地适应不同工况而充分发挥其制冷制热工作特性。Based on the study of the performance and advantages and disadvantages of thermoelectric cooler(TEC)technology,a thermoelectric cooling temperature control system with single-chip microcomputer as the core control element and TEC1-12706 as the executive element was designed. High precision piecewise PID control algorithm combined with PWM output control method is adopted to realize temperature control. The digital sensor DS18B20 is selected as the temperature detection element. It also includes 1602 LCD module,key adjustment input module and H bridge drive module. The actual test shows that the system has simple structure,convenient operation and excellent performance. Meanwhile,the temperature control algorithm specially designed for the system can make the semiconductor cooler better adapt to different working conditions and give full play to its refrigeration and heating characteristics.
上传时间： 2022-03-27
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温度控制如今已成为当代社会研究的热点之一,而温度检测在现代设备参数检测中也是一项极其重要的技术,应用十分广泛。与传统的测温方法相比,红外测温方法具有时间短、精度高、使用简单方便等优点。本文以环境温度为被测对象,设计了以STC89C52单片机为控制中心的红外测温装置,能够实现对目标温度的实时采集、处理、显示和报警等功能。本设计主要是由STC89C52单片机、红外测温传感器、LCD1602液晶显示器、按键和蜂鸣器等部分组成,采用非接触的方式对目标温度进行实时检测。Temperature control has become one of the hotspots in contemporary social research,and temperature detection is an extremely important technology in modern equipment parameter detection.Compared with traditional method,the infrared temperature measuring method has advantages of short time,high precision and convenient operation,etc.This paper consider environment temperature as research objects and designs an infrared temperature measuring device which employs the STC89C52singlechipas-control center,and it can realize timely collection,processing,display and alarm function of the target temperature.The design is mainly composed of STC89C52 singlechip,infrared temperature sensor,LCD1602monitor,keys and buzzer,etc.This design detects the target temperature by non-contact method.
上传时间： 2022-03-27
上传用户：jiabin
文章提出了一种基于AT89S51单片机的智能家居系统的设计,该系统具有室内煤气以及烟雾的检测、家庭室内防盗等功能。文章详细分析了系统的总体设计,详尽分析并设计了煤气传感器模块、烟雾传感器模块、人体红外感应传感器模块、报警模块等各硬件部分,并利用PROTUES软件进行了系统仿真。仿真结果证明:系统具有成本低、效率高、操作方便等优点,达到了预期设计的效果。This paper presents the design of an intelligent home system based on AT89S51 microcontroller.The system has the functions of detecting indoor gas and smoke,guarding against theft in the home,and so on.The overall design of the system is analyzed in detail.The gas sensor module,smoke sensor module,human infrared sensor module,alarm module and other hardware parts are analyzed and designed in detail,and the system simulation is carried out using PROTUES software.The simulation results show that the system has the advantages of low cost,high efficiency,convenient operation and so on,and achieves the expected design effect.
上传时间： 2022-03-28
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以单片机控制A/D转换器TLC549为例,对A/D转换器的主要技术指标进行了分析研究,在Proteus平台下,完成了A/D转换电路的构建,采用器件工作时序方式进行程序编写,借助仿真图表、虚拟仪器等工具对A/D转换的数据进行测量并对失调误差、增益误差、微分非线性、积分非线性和转换时间等重要参数进行了详细分析。结果表明:使用Proteus软件可对A/D转换过程进行定性分析,将抽象的A/D转换器技术指标直观化、形象化展现出来,有助于学生更好地理解A/D转换过程。The main technical indicators of A/D converter were analyzed and studied with an example from A/D converter TLC2543 which is controlled by using SCM.It was completed the construction of the A/D converter circuit under the Proteus software.The programming based on the operation sequence of the chip is put forward.With the aid of the simulation tools such as virtual instrument,simulation charts provided by Proteus,the important parameters of circuit such as offset error,gain error,differential nonlinearity(DNL),integral nonlinearity (INL) and conversion time are analyzed detailedly.Simulation results show that the A/D conversion process can be qualitatively analyzed and visualized the abstract indicators of A/D.The system can help students better to understand the SCM conversion process.
上传时间： 2022-04-04
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实验教学一直是工科教学中不可或缺的组成部分,对培养学生的动手能力,独立思考能力,创新思维与发散思维具有重要的作用。针对目前电路教学实验中电路仿真实验与实物电路实验各自独立,无法统一问题,提出将仿真电路实验与实物电路实验有机的结合同步操作,并使用Web发布实现远程实验操作。采用Multisim作为电路实验仿真平台,NI Eiviss II作为实物电路实验硬件平台,运用LabVIEW整合Multisim电路仿真实验与实物电路实验,实现仿真与实物实验有机结合,两种实验可同步进行。学生在仿真实验中先可探索实验,然后做实物实验。同时运用LabVIEW开发出实验过程人机交互操作接口界面,使用过程中效果良好。Experimental teaching has always been an indispensable part of engineering education.And it always plays an important role in cultivating students'practical ability,independent thinking ability,innovative thinking and divergent thinking.But simulation experiment and physical experiment cannot be unified in the circuit teaching experiment at present.In order to solve this problem,this paper proposes to combine organically the simulation circuit experiment with physical circuit experiment,and synchronously operate them.This paper uses the WEB publishing to achieve remote experimental operation.Multisim is used as the circuit simulation platform,and NI Eiviss II is used as the physical circuit hardware platform.Multisim circuit simulation experiment and physical circuit experiment are implemented by LabVIEW to realize the combination of simulation experiment and physical experiment.Students do explore experiments in simulation experiment firstly,and then do physical experiment.And this paper uses LabVIEW to develop the experimental man-machine interface.
上传时间： 2022-04-05
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高通(Qualcomm)蓝牙芯片QCC5144_硬件设计详细指导书（官方内部培训手册）其内容是针对硬件设计、部分重要元器件选择(ESD，Filter）及走线注意事项的详细说明。2 Power management 2.1 SMPS 2.1.1 Components specification 2.1.2 Input power supply selection 92.1.3 Minimize SMPS EMI emissions 2.1.4 Internal LDOs and digital core decoupling 2.1.5 Powering external components 2.2 Charger 2.2.1 Charger connections.2.2.2 General charger operation2.2.3 Temperature measurement during charging 2.3 SYS_CTRL 3 Bluetooth radio3.1 RF PSU component choice 3.2 RF band-pass filter3.3 Layout (天线 走线的注意事项)4 Audio4.1 Audio bypass capacitors 4.2 Earphone speaker output4.3 Line/Mic input 4.4 Headphone output optimizition5 LED pads 5.1 LED driver 5.2 Digital/Button input 5.3 Analog input5.4 Disabled 6 Reset pin (Reset#)7 USB interfaces7.1 USB device port7.1.1 USB device port7.1.2 Layout notes 7.1.3 USB charger detectionA QCC5144 VFBGA example schematic and BOM B Recommended SMPS components specificationB.1 Inductor specifition B.2 Recommended inductors B.3 SMPS capacitor specifition
上传时间： 2022-04-07
上传用户：默默
超声波换能器作为一种实用的检测手段，能实现声波所携带的信息和电能之间转换。它的性能优良，价格低廉，操作方便，易于调试，因此在工农业生产中发挥着重要的作用。但目前换能器驱动电路的发射频率多为40 kHz，本文针对1 MHz的超声波换能器电路进行了设计，主要介绍了它的发射驱动电路和接收驱动电路的设计方案，并对它们的功能进行了详细地说明。最后搭建实验平台，并对电路的输入、输出模块进行了测试。实验结果表明，换能器电路运行良好，可以为超声波高精度测量领域的应用提供参考。As a practical means of detection, ultrasonic transducer can realize the conversion between theinformation carried by sound wave and electric energy.It has the advantages of excellent performance,low cost, convenient operation and debugging, so plays an important role in industrial and agriculturalproduction.However, the transmitting frequency of the driving circuit for most transducer is 40 kHz.Thecircuit of 1 MHz ultrasonic transducer is designed In this paper. It mainly introduces the emissive drivingcircuit and the receiving circuit design and the detailed function of them. Finally, the experimentalplatform is built, and the circuit of input and output were tested. Experiments show that the transducer＇ s...
上传时间： 2022-04-28
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这是一本英文版的MPC的MATLAB教程，讲这一块的资料太少了，故上传一本。MPC is one of the few areas that has received on-going interest from researchers in both the industrial and cademic communities.Four major aspects of model predictive control make the design methodology attractive to both practitioners and academics.This is particularly attractive to industry where tight profit margins and limits on the process operation are inevitably present. The third aspect is the ability to perform on-line process optimization. The fourth aspect is the simplicity of the design framework in handling all these complex issues.
标签： 模型预测控制
上传时间： 2022-05-05
上传用户：zhanglei193
The JW® 7805 is a low noise low-dropout (LDO) voltage regulator with enable function that operates from 1.8V to 5.5V. It provides up to 300mA of output current and offers low-power operation in miniaturized packaging. JW7805 supports fixed output voltage 0.9V, 1.0V, 1.05V, 1.1V,1.2V, 1.3V, 1.35V, 1.5V, 1.8V, 1.85V, 2.1V, 2.2V, 2.3V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V,3.1V, 3.3V, 3.6V, 4.2V, 4.4V and 5.0V. The features of low quiescent current as low as 6uA and almost zero disable current are ideal for powering the battery equipment. JW7805’s low output noise and high PSRR are also friendly to RF systems.
标签： JW7805
上传时间： 2022-05-06
上传用户：slq1234567890
