本系统基于STM32单片机设计的非接触式电流检测控制系统,通过OPA548片将所给任意信号放大,由100Ω电阻和INA128芯片进行电流电压转换放大后,利用STM32单片机对获取的电压信号以0.488μs频率采样,利用STM32单片机的FFT库,获得信号的谐波信息。测量电流信号精准,该设计可广泛应用在以STM32单片机为核心控制器件的新型仪表中,性能精准且抗干扰能力强。This system is a non-contact current detection and control system based on STM32 single chip microcomputer. It amplifiesany signal through OPA548 chip, converts and amplifies the current and voltage by 100 Ω resistance and INA128 chip. The obtainedvoltage signal is sampled at the frequency of 0.488 μs by STM 32 single chip microcomputer, and the harmonic information of the signalis obtained by the FFT library of STM 32 single chip microcomputer. The measurement of current signal is accurate. This design can bewidely used in a new instrument with STM 32 single chip microcomputer as its core control device, with accurate performance and stronganti-interference capability.
上传时间： 2022-03-27
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数字示波器功能强大,使用方便,但是价格相对昂贵。本文以Ti的MSP430F5529为主控器,以Altera公司的EP2C5T144C8 FPGA器件为逻辑控制部件设计数字示波器。模拟信号经程控放大、整形电路后形成方波信号送至FPGA测频,根据频率值选择采用片上及片外高速AD分段采样。FPGA控制片外AD采样并将数据输入到FIFO模块中缓存,由单片机进行频谱分析。测试表明:简易示波器可以实现自动选档、多采样率采样、高精度测频及频谱分析等功能。Digital oscilloscope is powerful and easy to use, but also expensive. The research group designed a low-cost digital oscilloscope, the chip of MSP430F5529 of TI is chosen as the main controller and the device of EP2C5T144C8 of Altera company is used as the logic control unit. Analog signal enter the programmable amplifier circuit, shaping circuit and other pre-processing circuit. The shaped rectangular wave signal is sent to FPGA for measure the frequency. According to the frequency value to select AD on-chip or off-chip high-speed AD for sampling. FPGA controls the off-chip AD sampling and buffers AD data by FIFO module. The single chip microcomputer receives the data, and do FFT for spectrum analysis. The test shows that the simple oscilloscope can realize automatic gain selection, sampling at different sampling rates, high precision frequency measurement and spectrum analysis.
上传时间： 2022-03-27
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目的:自主研制一款超声手术刀电源控制系统,以减少能量的消耗,维持手术刀的正常温度。方法:对超声换能器在谐振附近的等效电路建立模型,并设计基于数字信号处理(DSP)的超声手术刀的硬件控制系统。结果:经对电源控制系统的电路和工作性能测试,生成的电流和电压的有效值等参数,能够及时调整电源的频率,并达到预期的功能指标,使超声手术刀工作在谐振状态。结论:以DSP为核心设计的超声手术刀电源控制系统,测试指标均能够达到预期的要求,能够使系统在谐振状态下工作。Objective: To independently develop a power control system of ultrasonic scalpel so as to reduce the energy consumption and maintain the normal temperature of ultrasonic scalpel. Methods: In this paper, the model of equivalent circuit of ultrasonic transducer nearby syntony was built up, and the hardware control system of ultrasonic scalpel based on digital signal processing(DSP) was designed. Results: Through testing the circuit and work performance of power control system, the series of parameters such as effective value and so on which were produced by this system could adjust frequency of power source in time and attain anticipative functional indicator, and it took the ultrasonic scalpel to work in syntonic situation. Conclusion: The tested indicators of power control system of ultrasonic scalpel based on the kernel design of DSP can attain anticipative requirement, and can take this system to work in syntonic situation.
上传时间： 2022-04-03
上传用户：bluedrops
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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数字频率计是电工电子中常用的测量仪器,数字频率计通过用输入待测信号对一特定长度的信号进行计数,从而得出频率并通过数码管直观的显示出来。本文提出了一种与输入同步的数字频率计的设计,提高了频率计的精度,设计采用Multisim软件进行设计和仿真的过程,介绍了其工作原理,硬件电路设计和仿真的过程。设计采用了Multisim软件进行设计和仿真,设计结果得到的验证。Digital frequency counter is used to measure the frequency of a signal.It is common to use a multivibrator to generate a standard 1 second time base signal and count input signal gated by this signal.However,the asynchronous of this time base signal with input signal will bring errors.In this paper,a high precision frequency counter which use synchronized time base signal generator is proposed.This frequency counter is designed and simulated by Multisim tools and result is verified.
标签： multisim
上传时间： 2022-05-08
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射频识别（即RFID，Radio Frequency Identification）技术是一种利用无线射频信号进行自动识别并进行信息传输的技术。随着社会的进步和科技的发展，它已经广泛应用于公安、金融、交通、医疗等社会生活的各个方面。伴随着各种射频卡应用的越来越普及，与之相关的射频卡读卡器也取得了飞速的发展，越来越多的公司、科研机构纷纷投入到智能射频卡读卡器以及相关应用系统的研究和开发当中。 目前我国流行最广泛的非接IC卡基本都是基于ISO/IEC14443协议的Mifare卡、TYPEA CPU卡、TYPEB CPU卡等，伴随着这些卡的应用，相应读卡器也有很多种，这些读卡器所采用的核心设计都是利用微处理器控制相应射频处理芯片来实现。目前国际上射频处理芯片设计基本被恩智浦（NXP，Philips前身）、德州仪器(TI)等几大半导体公司所控制，其高昂的费用不但影响了RFID技术在诸多领域的大面积推广，也造成了大量外汇流失。 为响应国家关于半导体产业国产化的号召，加快国产射频芯片在RFID领域的推广应用，本文结合RFID技术以及嵌入式系统设计要求，采用上海复旦徼电子集团股份有限公司设计的FM17550射频芯片结合意法半导体公司的CortexM0核的单片机设计了一款支持Mifare卡、TYPEA CPU卡、TYPEB CPU卡以及NFC功能的通用读卡器。本设计最大的特点在于支持多类型射频卡片且成本低廉。 本文首先阐述了射频识别技术的研究应用现状及相关的智能射频卡应用的相关标准，接着从硬件方面介绍该射频读卡器所包含的主要模块的相关设计，然后讲述了射频读卡器在天线调试过程中的一些方法，软件方面主要讲述该读卡器各种射频卡片的功能实现以及在不同行业应用当中带来的积极的社会和经济价值。
上传时间： 2022-06-09
上传用户：XuVshu
說明：1，测试交流电源（Test AC Power Supply）：A.中国（China）：AC 220V+/-2%50Hz+/-2%B.美国（United States of America）：AC 120V+/-2%60Hz+/-2%。C.英国（Britain）：AC 240V+/-2%50Hz+/-2%D.欧洲（Europe）：AC 230V+/-2%50Hz+/-2%E.日本（Japan）：AC 100V+/-2%60Hz+/-2%F.墨西哥（Mexico）：AC 127V+/-2%60Hz+/-2%2，测试温度条件（Test Temperature Conditions）：25℃+/-2℃。3，测试以右声道为准（Standard Test Use Right Channell）4，信号由AUX插座输入（Signal From AUX Jack Input）。5，测试以音量最大，音调和平衡在中央位置（电子音调在正常状态）。（Test Volume Setup Max，Equalizer And Balance Setup Center）。6，标准輸出（Standard Output）：A.输入1 KHz频率信号（Input 1 KHz Frequency Signal）B.左右声道输入信号测试右声道（L&R Input Signal Test Use R Channel）C.额定输出功率満（Rating Output Power Full）10 W，标准输出定为1w.（Rating Output Power Full 10 w，Standard Output Setup 1 W）D.额定输出功率1W到10w，标准输出定为500 mW（Rating Output Power 1 W To 10 W，Standard Output Setup 500 mW）E.额定输出功率小于1w，标准输出定为50 mW（Rating Output Power Not Full 1 W，Standard Output Setup 50 mW）F.标准輸出电压以V-VPR为准（Standard Output Voltage Use V-V/PR）。G.V-V/PR中P为额定输出功率，R为喇叭标称阻抗。
标签： 音响功放
上传时间： 2022-06-18
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DescriptionThe IMX385LQR-C is a diagonal 8.35 mm (Type 1/2) CMOS active pixel type solid-state image sensor with a squarepixel array and 2.13 M effective pixels. This chip operates with analog 3.3 V, digital 1.2 V, and interface 1.8 V triplepower supply, and has low power consumption. High sensitivity, low dark current and no smear are achieved throughthe adoption of R, G and B primary color mosaic filters. This chip features an electronic shutter with variablecharge-integration time.(Applications: Surveillance cameras)
标签： CMOS传感器 IMX385LQR-C
上传时间： 2022-06-18
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sony CMOS传感器datasheet，IMX178LQJ-C_Data_SheetDescriptionThe IMX178LQJ-C is a diagonal 8.92 mm (Type 1/1.8) CMOS active pixel type image sensor with a square pixelarray and 6.44 M effective pixels. This chip operates with analog 2.9 V, digital 1.2 V and interface 1.8 V triple powersupply, and has low power consumption.High sensitivity, low dark current and no smear are achieved through the adoption of R, G and B primary colormosaic filters.This chip features an electronic shutter with variable charge-integration time.(Applications: Surveillance cameras, FA cameras, Industrial cameras)
标签： CMOS传感器 IMX178LQJ-C
上传时间： 2022-06-18
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canopen 402协议，运动控制资料，“The CANopen device profile for drives and motion controllers defines the interface to frequency inverters, servo controllers as well as stepper motors.”
标签： canopen
上传时间： 2022-06-18
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