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Frequency-divis

  • 基于STM32單片機(jī)設(shè)計(jì)的非接觸式電流檢測(cè)控制系統(tǒng)

    本系統(tǒng)基于STM32單片機(jī)設(shè)計(jì)的非接觸式電流檢測(cè)控制系統(tǒng),通過OPA548片將所給任意信號(hào)放大,由100Ω電阻和INA128芯片進(jìn)行電流電壓轉(zhuǎn)換放大后,利用STM32單片機(jī)對(duì)獲取的電壓信號(hào)以0.488μs頻率采樣,利用STM32單片機(jī)的FFT庫(kù),獲得信號(hào)的諧波信息。測(cè)量電流信號(hào)精準(zhǔn),該設(shè)計(jì)可廣泛應(yīng)用在以STM32單片機(jī)為核心控制器件的新型儀表中,性能精準(zhǔn)且抗干擾能力強(qiáng)。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.

    標(biāo)簽: stm32 單片機(jī)

    上傳時(shí)間: 2022-03-27

    上傳用戶:

  • 基于MSP430單片機(jī)及FPGA的簡(jiǎn)易數(shù)字示波器

    數(shù)字示波器功能強(qiáng)大,使用方便,但是價(jià)格相對(duì)昂貴。本文以Ti的MSP430F5529為主控器,以Altera公司的EP2C5T144C8 FPGA器件為邏輯控制部件設(shè)計(jì)數(shù)字示波器。模擬信號(hào)經(jīng)程控放大、整形電路后形成方波信號(hào)送至FPGA測(cè)頻,根據(jù)頻率值選擇采用片上及片外高速AD分段采樣。FPGA控制片外AD采樣并將數(shù)據(jù)輸入到FIFO模塊中緩存,由單片機(jī)進(jìn)行頻譜分析。測(cè)試表明:簡(jiǎn)易示波器可以實(shí)現(xiàn)自動(dòng)選檔、多采樣率采樣、高精度測(cè)頻及頻譜分析等功能。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.

    標(biāo)簽: msp430 單片機(jī) fpga 數(shù)字示波器

    上傳時(shí)間: 2022-03-27

    上傳用戶:

  • 基于數(shù)字信號(hào)處理的超聲手術(shù)刀電源控制電路設(shè)計(jì)與實(shí)現(xiàn)

    目的:自主研制一款超聲手術(shù)刀電源控制系統(tǒng),以減少能量的消耗,維持手術(shù)刀的正常溫度。方法:對(duì)超聲換能器在諧振附近的等效電路建立模型,并設(shè)計(jì)基于數(shù)字信號(hào)處理(DSP)的超聲手術(shù)刀的硬件控制系統(tǒng)。結(jié)果:經(jīng)對(duì)電源控制系統(tǒng)的電路和工作性能測(cè)試,生成的電流和電壓的有效值等參數(shù),能夠及時(shí)調(diào)整電源的頻率,并達(dá)到預(yù)期的功能指標(biāo),使超聲手術(shù)刀工作在諧振狀態(tài)。結(jié)論:以DSP為核心設(shè)計(jì)的超聲手術(shù)刀電源控制系統(tǒng),測(cè)試指標(biāo)均能夠達(dá)到預(yù)期的要求,能夠使系統(tǒng)在諧振狀態(tài)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.

    標(biāo)簽: 數(shù)字信號(hào)處理 超聲手術(shù)刀 電源控制

    上傳時(shí)間: 2022-04-03

    上傳用戶:bluedrops

  • 1MHz換能器驅(qū)動(dòng)電路的設(shè)計(jì)

    超聲波換能器作為一種實(shí)用的檢測(cè)手段,能實(shí)現(xiàn)聲波所攜帶的信息和電能之間轉(zhuǎn)換。它的性能優(yōu)良,價(jià)格低廉,操作方便,易于調(diào)試,因此在工農(nóng)業(yè)生產(chǎn)中發(fā)揮著重要的作用。但目前換能器驅(qū)動(dòng)電路的發(fā)射頻率多為40 kHz,本文針對(duì)1 MHz的超聲波換能器電路進(jìn)行了設(shè)計(jì),主要介紹了它的發(fā)射驅(qū)動(dòng)電路和接收驅(qū)動(dòng)電路的設(shè)計(jì)方案,并對(duì)它們的功能進(jìn)行了詳細(xì)地說明。最后搭建實(shí)驗(yàn)平臺(tái),并對(duì)電路的輸入、輸出模塊進(jìn)行了測(cè)試。實(shí)驗(yàn)結(jié)果表明,換能器電路運(yùn)行良好,可以為超聲波高精度測(cè)量領(lǐng)域的應(yīng)用提供參考。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...

    標(biāo)簽: 換能器 驅(qū)動(dòng)電路

    上傳時(shí)間: 2022-04-28

    上傳用戶:

  • 基于Multisim的高精度數(shù)字頻率計(jì)的設(shè)計(jì)和仿真

    數(shù)字頻率計(jì)是電工電子中常用的測(cè)量?jī)x器,數(shù)字頻率計(jì)通過用輸入待測(cè)信號(hào)對(duì)一特定長(zhǎng)度的信號(hào)進(jìn)行計(jì)數(shù),從而得出頻率并通過數(shù)碼管直觀的顯示出來。本文提出了一種與輸入同步的數(shù)字頻率計(jì)的設(shè)計(jì),提高了頻率計(jì)的精度,設(shè)計(jì)采用Multisim軟件進(jìn)行設(shè)計(jì)和仿真的過程,介紹了其工作原理,硬件電路設(shè)計(jì)和仿真的過程。設(shè)計(jì)采用了Multisim軟件進(jìn)行設(shè)計(jì)和仿真,設(shè)計(jì)結(jié)果得到的驗(yàn)證。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.

    標(biāo)簽: multisim

    上傳時(shí)間: 2022-05-08

    上傳用戶:

  • 基于FM17550的RFID讀卡器的設(shè)計(jì)與實(shí)現(xiàn)

    射頻識(shí)別(即RFID,Radio Frequency Identification)技術(shù)是一種利用無線射頻信號(hào)進(jìn)行自動(dòng)識(shí)別并進(jìn)行信息傳輸?shù)募夹g(shù)。隨著社會(huì)的進(jìn)步和科技的發(fā)展,它已經(jīng)廣泛應(yīng)用于公安、金融、交通、醫(yī)療等社會(huì)生活的各個(gè)方面。伴隨著各種射頻卡應(yīng)用的越來越普及,與之相關(guān)的射頻卡讀卡器也取得了飛速的發(fā)展,越來越多的公司、科研機(jī)構(gòu)紛紛投入到智能射頻卡讀卡器以及相關(guān)應(yīng)用系統(tǒng)的研究和開發(fā)當(dāng)中。  目前我國(guó)流行最廣泛的非接IC卡基本都是基于ISO/IEC14443協(xié)議的Mifare卡、TYPEA CPU卡、TYPEB CPU卡等,伴隨著這些卡的應(yīng)用,相應(yīng)讀卡器也有很多種,這些讀卡器所采用的核心設(shè)計(jì)都是利用微處理器控制相應(yīng)射頻處理芯片來實(shí)現(xiàn)。目前國(guó)際上射頻處理芯片設(shè)計(jì)基本被恩智浦(NXP,Philips前身)、德州儀器(TI)等幾大半導(dǎo)體公司所控制,其高昂的費(fèi)用不但影響了RFID技術(shù)在諸多領(lǐng)域的大面積推廣,也造成了大量外匯流失。  為響應(yīng)國(guó)家關(guān)于半導(dǎo)體產(chǎn)業(yè)國(guó)產(chǎn)化的號(hào)召,加快國(guó)產(chǎn)射頻芯片在RFID領(lǐng)域的推廣應(yīng)用,本文結(jié)合RFID技術(shù)以及嵌入式系統(tǒng)設(shè)計(jì)要求,采用上海復(fù)旦徼電子集團(tuán)股份有限公司設(shè)計(jì)的FM17550射頻芯片結(jié)合意法半導(dǎo)體公司的CortexM0核的單片機(jī)設(shè)計(jì)了一款支持Mifare卡、TYPEA CPU卡、TYPEB CPU卡以及NFC功能的通用讀卡器。本設(shè)計(jì)最大的特點(diǎn)在于支持多類型射頻卡片且成本低廉。  本文首先闡述了射頻識(shí)別技術(shù)的研究應(yīng)用現(xiàn)狀及相關(guān)的智能射頻卡應(yīng)用的相關(guān)標(biāo)準(zhǔn),接著從硬件方面介紹該射頻讀卡器所包含的主要模塊的相關(guān)設(shè)計(jì),然后講述了射頻讀卡器在天線調(diào)試過程中的一些方法,軟件方面主要講述該讀卡器各種射頻卡片的功能實(shí)現(xiàn)以及在不同行業(yè)應(yīng)用當(dāng)中帶來的積極的社會(huì)和經(jīng)濟(jì)價(jià)值。

    標(biāo)簽: fm17550 rfid 讀卡器

    上傳時(shí)間: 2022-06-09

    上傳用戶:XuVshu

  • 音響功放測(cè)試方法

    說明:1,測(cè)試交流電源(Test AC Power Supply):A.中國(guó)(China):AC 220V+/-2%50Hz+/-2%B.美國(guó)(United States of America):AC 120V+/-2%60Hz+/-2%。C.英國(guó)(Britain):AC 240V+/-2%50Hz+/-2%D.歐洲(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,測(cè)試溫度條件(Test Temperature Conditions):25℃+/-2℃。3,測(cè)試以右聲道為準(zhǔn)(Standard Test Use Right Channell)4,信號(hào)由AUX插座輸入(Signal From AUX Jack Input)。5,測(cè)試以音量最大,音調(diào)和平衡在中央位置(電子音調(diào)在正常狀態(tài))。(Test Volume Setup Max,Equalizer And Balance Setup Center)。6,標(biāo)準(zhǔn)輸出(Standard Output):A.輸入1 KHz頻率信號(hào)(Input 1 KHz Frequency Signal)B.左右聲道輸入信號(hào)測(cè)試右聲道(L&R Input Signal Test Use R Channel)C.額定輸出功率満(Rating Output Power Full)10 W,標(biāo)準(zhǔn)輸出定為1w.(Rating Output Power Full 10 w,Standard Output Setup 1 W)D.額定輸出功率1W到10w,標(biāo)準(zhǔn)輸出定為500 mW(Rating Output Power 1 W To 10 W,Standard Output Setup 500 mW)E.額定輸出功率小于1w,標(biāo)準(zhǔn)輸出定為50 mW(Rating Output Power Not Full 1 W,Standard Output Setup 50 mW)F.標(biāo)準(zhǔn)輸出電壓以V-VPR為準(zhǔn)(Standard Output Voltage Use V-V/PR)。G.V-V/PR中P為額定輸出功率,R為喇叭標(biāo)稱阻抗。

    標(biāo)簽: 音響功放

    上傳時(shí)間: 2022-06-18

    上傳用戶:

  • canopen 402協(xié)議,運(yùn)動(dòng)控制資料

    canopen 402協(xié)議,運(yùn)動(dòng)控制資料,“The CANopen device profile for drives and motion controllers defines the interface to frequency inverters, servo controllers as well as stepper motors.”

    標(biāo)簽: canopen

    上傳時(shí)間: 2022-06-18

    上傳用戶:

  • 基于有藍(lán)牙共存情況下的WiFi射頻模塊設(shè)計(jì)

    移動(dòng)通信網(wǎng)絡(luò)由于帶寬和技術(shù)的限制,遠(yuǎn)遠(yuǎn)不能滿足人們不斷高漲的無線上網(wǎng)需求。Wi-Fi作為無線接入技術(shù)MLAN的主流標(biāo)準(zhǔn)口益成熟,它能夠隨時(shí)隨地高速連接到Internet,極大地滿足了用戶對(duì)無線上網(wǎng)需求,受到消費(fèi)者的青睞。因而越來越多的移動(dòng)終端都集成了Wi-Fi功能,Wi-Fi和藍(lán)牙樣成為移動(dòng)終端的標(biāo)配。隨之而來的是wi-Fi和藍(lán)牙都工作在2.4CHZz ISM頻段而引發(fā)的互相 擾問題,導(dǎo)致數(shù)據(jù)吞吐量下降,語音質(zhì)量惡化失真,極端狀況下甚至導(dǎo)致鏈路斷開而不能正常工作。因此,必須尋求有效的措施和方法,實(shí)現(xiàn)兩種技術(shù)在近距離的和諧共存,這已成為非常迫切的技術(shù)需要,也成為人們研究的一個(gè)熱點(diǎn)和難點(diǎn)。近距離WiFi和藍(lán)牙互相1擾的問題,目前已經(jīng)形成了非常多的有效解決機(jī)制,包括基于Wi-Fi的PTA(Packet Traffic Arbitration)、AWMA(Alternating Wireless Medium Access)和DSE(Deterministic Spectral Excision),其中PTA和AWMA機(jī)制在Wi-Fi側(cè)MAC層實(shí)現(xiàn),通過協(xié)調(diào)Wi-Fi和藍(lán)牙的幀發(fā)射時(shí)間來避免相互干擾:而DSE是在Wi-Fi側(cè)物理層PHY實(shí)現(xiàn),通過一個(gè)可編程帶阻濾波器(Notch Filter)來阻止來白藍(lán)牙的窄帶干擾。還有基于藍(lán)牙側(cè)的AFH(Adaptive Frequency Hopping),它通過跳頻,自動(dòng)避開被干擾的頻點(diǎn),從而大大提高了藍(lán)牙傳輸性能。

    標(biāo)簽: 藍(lán)牙共存 wifi 射頻模塊

    上傳時(shí)間: 2022-06-20

    上傳用戶:zhanglei193

  • RFID射頻識(shí)別技術(shù)介紹

    第一章 RFID基礎(chǔ)知識(shí)簡(jiǎn)介1.1 RFID的定義RFID是什么?RFID是Radio Frequency Identification的縮寫,即射頻識(shí)別,俗稱電子標(biāo)簽。RFID其主要核心部件是一個(gè)電子標(biāo)簽,直徑僅為2毫米不到,通過相距幾厘米到幾米距離內(nèi)傳感器發(fā)射的無線電波,可以讀取電子標(biāo)簽內(nèi)儲(chǔ)存的信息,識(shí)別電子標(biāo)簽代表的物品、人和器具的身份。1.2 RFID射頻識(shí)別技術(shù)的概念RFID射頻識(shí)別是一種非接觸式的自動(dòng)識(shí)別技術(shù),它通過射頻信號(hào)自動(dòng)識(shí)別目標(biāo)對(duì)象并獲取相關(guān)數(shù)據(jù),識(shí)別工作無須人工干預(yù),可工作于各種惡劣環(huán)境。RFID技術(shù)可識(shí)別高速運(yùn)動(dòng)物體并可同時(shí)識(shí)別多個(gè)標(biāo)簽,操作快捷方便。埃森哲實(shí)驗(yàn)室首席科學(xué)家弗格森認(rèn)為RFID是一種突破性的技術(shù):"第一,可以識(shí)別單個(gè)的非常具體的物體,而不是像條形碼那樣只能識(shí)別一類物體;第二,其采用無線電射頻,可以透過外部材料讀取數(shù)據(jù),而條形碼必須靠激光來讀取信息;第三,可以同時(shí)對(duì)多個(gè)物體進(jìn)行識(shí)讀,而條形碼只能一個(gè)一個(gè)地讀。此外,儲(chǔ)存的信息量也非常大。

    標(biāo)簽: rfid 射頻識(shí)別

    上傳時(shí)間: 2022-06-22

    上傳用戶:slq1234567890

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