電學(xué)中的測量技術(shù)涉及范圍非常廣,電流測量在電學(xué)計量中占有非常重要的位置。如何精確地進(jìn)行電流測量是精密測量的一大難題。傳統(tǒng)的電流檢測電路多采用運(yùn)算放大芯片與片外電流檢測電路相結(jié)合的方式,電路集成度很低,需要較多的接口和資源才能完成對電路的檢測。本文把所有電路部分都集成在一塊芯片上,包括檢測電阻,運(yùn)算放大器電路及模擬轉(zhuǎn)數(shù)字轉(zhuǎn)換電路,從而在電路內(nèi)部可以進(jìn)行電流檢測,使電路更好的集成化。前置電路使用二級共源共柵結(jié)構(gòu)的運(yùn)算放大器,減小溝道長度調(diào)制效應(yīng)造成的電流誤差。10位SAR ADC中采用電容驅(qū)動能力強(qiáng)的傳輸門保證了模數(shù)轉(zhuǎn)化器的有效精度。比較器模塊采用再生鎖存器與遲滯比較器作為基礎(chǔ)單元組合解決精密測量的問題。本設(shè)計可以作為嵌入芯片內(nèi)的一小部分而檢測芯片中的微小電流1mA~100mA,工作電壓在1.8v左右,電流檢測精度預(yù)期達(dá)到10uA的需求。The measurement technology in electricity involves a wide range,and current measurement plays a very important position in electrical measurement.How to accurately measure current is a big problem in precision measurement. The traditional current detecting circuit adopts the combination of the operational amplifier chip and theoff-chip current detecting circuit, The circuit integration is very low, and more interfaces and resources are needed tocomplete the circuit detection.This topic integrates all the circuit parts into one chip, including detection resistance, operational amplifier circuit andanalog to digital conversion circuit. Highly integrated circuit makes the external resources on the chip more intensive,so that current detection can be carried out inside the circuit, so that the circuit can be better integrated. Thefront-end circuit of this project uses two-stage cascade operational amplifier and cascade tube to reduce the currenterror caused by channel length modulatIOn effect. In 10-bit SAR ADC, the transmission gate with strong capacitivedriving ability ensures the effective accuracy of the analog-to-digital converter. Comparator module uses regenerativelatch and hysteresis comparator as basic unit to solve the difficult problem of precision measurement. This topic can beused as a small part of the embedded chip to detect the micro-current in the chip 1 mA~100 mA, the working voltageis about 1.8v, and the current detection accuracy is expected to reach the requirement of 10 uA.
標(biāo)簽： 電流檢測 電路 運(yùn)算放大器 adc
上傳時間： 2022-04-03
上傳用戶：
基于TMS320F28035芯片為控制核心的空間矢量異步電機(jī)變頻器 我們設(shè)計的異步電機(jī)變頻調(diào)速器以TMS320F28035芯片為控制核心，通過輸出三相PWM波控制智能功率模塊IPM驅(qū)動三相異步電機(jī)。我們使用空間矢量SVPWM算法，并對其進(jìn)行了優(yōu)化。采用檢測反電勢的方法省去了昂貴的光電編碼器，大大節(jié)省了成本。同時開創(chuàng)性的研發(fā)了自動根據(jù)運(yùn)行環(huán)境調(diào)節(jié)的自適應(yīng)變頻算法，使我們的變頻調(diào)速器可以在電網(wǎng)條件惡劣的鄉(xiāng)村山區(qū)工作，由此該變頻器已被一家民用水泵生產(chǎn)企業(yè)預(yù)訂。關(guān)鍵字 變頻器 TMS320f28035 IPM SVPWM In our design, the asynchronous machine inverter based on the chip of TMS320F28035 drives the three-Phase asynchronous machine by sending three-phase PWM waves to the IPM, which is short for the Intelligent-Power-Module. The SVPWM (space vector pulse width modulatIOn) strategy is applied to our control algorithm and we optimize it mainly in two aspects. Firstly the inverter detects the speed by measuring the Back EMF instead of installing an expensive photoelectric encoder for costs reduction.
標(biāo)簽： tms320f28035 芯片
上傳時間： 2022-05-08
上傳用戶：zhanglei193
本設(shè)計針對目前市場上傳統(tǒng)充電控制器對蓄電池的充放電控制不合理，同時保護(hù)也不夠充分，使得蓄電池的壽命縮短這種情況，研究確定了一種基于單片機(jī)的太陽能充電控制器的方案。在太陽能對蓄電池的充放電方式、控制器的功能要求和實(shí)際應(yīng)用方面做了一定分析，完成了硬件電路設(shè)計和軟件編制，實(shí)現(xiàn)了對蓄電池的高效率管理。設(shè)計一種太陽能LED照明系統(tǒng)充電控制器，既能實(shí)現(xiàn)太陽能電池的最大功率點(diǎn)跟蹤（MPPT）又能滿足蓄電池電壓限制條件和浮充特性。構(gòu)建實(shí)驗(yàn)系統(tǒng)，測試表明，控制器可以根據(jù)蓄電池狀態(tài)準(zhǔn)確地在MPPT、恒壓、浮充算法之間切換，MPPT充電效率較恒壓充電提高約16%，該充電控制器既實(shí)現(xiàn)了太陽能的有效利用，又延長了蓄電池的使用壽命。在總體方案的指導(dǎo)下，本設(shè)計使用STMSS系列8位微控制器是STM8系列的主流微控制器產(chǎn)品，采用意法半導(dǎo)體的130納米工藝技術(shù)和先進(jìn)的內(nèi)核架構(gòu)，主頻達(dá)到16MHz（105系列），處理能力高達(dá)20MTPS。內(nèi)置EEPROM、阻容（RC）振蕩器以及完整的標(biāo)準(zhǔn)外設(shè)，性價比高，STMSS指令格式和意法半導(dǎo)體早期的ST7系列基本類似，甚至兼容，內(nèi)嵌單線仿真接口模塊，支持STWM仿真，降低了開發(fā)成本；擁有多種外設(shè)，而且外設(shè)的內(nèi)部結(jié)構(gòu)、配置方式與意法半導(dǎo)體的同樣是Cortex-M3內(nèi)核的32位嵌入式微處理器STM32系列的MCU基本相同或者相似。另外系列芯片功耗低、功能完善、性價比高，可廣泛應(yīng)用在家用電器、電源控制和管理、電機(jī)控制等領(lǐng)域，是8位機(jī)為控制器控制系統(tǒng)較為理想的升級替代控制芯片"261，軟件部分依據(jù)PWM（Pulse Wiath modulatIOn）脈寬調(diào)制控制策略，編制程序使單片機(jī)輸出PMM控制信號，通過控制光電耦合器通斷進(jìn)而控制MOSFET管開啟和關(guān)閉，達(dá)到控制蓄電池充放電的目的，同時按照功能要求實(shí)現(xiàn)了對蓄電池過充、過放保護(hù)和短路保護(hù)。實(shí)驗(yàn)表明，該控制器性能優(yōu)良，可靠性高，可以時刻監(jiān)視太陽能電池板和蓄電池狀態(tài)，實(shí)現(xiàn)控制蓄電池最優(yōu)充放電，達(dá)到延長蓄電池的使用壽命。
上傳時間： 2022-06-19
上傳用戶：
le flows through MOS channel while Ih flows across PNP transistor Ih= a/(1-a) le, IE-le+lh=1/(1-a)' le Since IGBT has a long base PNP, a is mainly determined by ar si0 2ar= 1/cosh(1/La), La: ambipolar diff length a-0.5 (typical value)p MOSFET channel current (saturation), le=U"Cox"W(2"Lch)"(Vc-Vth)le Thus, saturated collector current Ic, sat=1/(1-a)"le=-1/(1-a)"UCox"W/(2Lch)"(Vo-Vth)2Also, transconductance gm, gm= 1/(1-a)"u' Cox W/Lch*(Vo-Vth)Turn-On1. Inversion layer is formed when Vge>Vth2. Apply positive collector bias, +Vce3. Electrons flow from N+ emitter to N-drift layer providing the base current for the PNP transistor4. Since J1 is forward blased, hole carriers are injected from the collector (acts as an emitter).5. Injected hole carriers exceed the doping level of N-drift region (conductivity modulatIOn). Turn-Off1. Remove gate bias (discharge gate)2. Cut off electron current (base current, le, of pnp transistor)
標(biāo)簽： igbt
上傳時間： 2022-06-20
上傳用戶：wangshoupeng199
INTRODUCTION In the past, adding speech recording and playback capability to a product meant using a digital signal processor or a specialized audio chip. Now, using a simplified Adaptive Differential Pulse Code modulatIOn(ADPCM) algorithm, these audio capabilities can be added to any PICmicro device. This application note will cover the ADPCM compression and decompression algorithms, performance comparison of all PICmicro devices, and an application using a PIC16C72 micro-controller.DEFINITION OF TERMS step size -value of the step used for quantization of ana-log signals and inverse quantization of a number of steps.quantization -the digital form of an analog input signal is represented by a finite number of steps.adaptive quantization -the step size of a quantizer is dramatically changed with time in order to adapt to a changing input signal.inverse quantizer -a finite number of steps is converted into a digital representation of an analog signal.
上傳時間： 2022-06-20
上傳用戶：
摘要：本系統(tǒng)以ICL8038集成塊為核心器件，制作一種函數(shù)信號發(fā)生器，制作成本較低。適合學(xué)生學(xué)習(xí)電子技術(shù)測量使用。ICL8038是一種具有多種波形輸出的精密振蕩集成電路，只需要個別的外部元件就能產(chǎn)生從0.001Hz~30KlHz的低失真正弦波、三角波、矩形波等脈沖信號。輸出波形的頻率和占空比還可以由電流或電阻控制。另外由于該芯片具有調(diào)制信號輸入端，所以可以用來對低頻信號進(jìn)行頻率調(diào)制。關(guān)鍵詞：函數(shù)信號發(fā)生器頻率調(diào)制Abstract：The system ICL8038 integrated block as the core device，producing a kind of function signal generator，producing low cost.Suitable for students to learn the use of electronic technology measurement.ICL8038 is a kind of multi-precision oscillator waveform output integrated circuits，a separate external components only need to be able to generate from the 0.001Hz ~30KHz low-distortion sine wave，triangle wave，square wave pulse signal，etc..Output waveform of the frequency and duty cycle can also be controlled by a currentor resistance.In addition，as the chip has a modulated signal input terminal，it can be used to low-frequency signal is frequency modulatIOn.
標(biāo)簽： icl8038 函數(shù)發(fā)生器 電路
上傳時間： 2022-07-04
上傳用戶：zhanglei193
簡介本文檔介紹了如何使用dsPIC30F數(shù)字信號控制器（Digital Signal Controller，DSC）控制正弦電流來驅(qū)動具有位置傳感器的永磁同步電機(jī)（Permanent Mag-net Synchronous Motor，PMSM）.電機(jī)控制固件使用dsPIC30F外設(shè)，而數(shù)學(xué)運(yùn)算則由DSP引擎完成。為充分利用dsPIC30F的特殊DSP運(yùn)算性能，固件采用C語言編寫，只有某些子程序采用匯編語言編寫。應(yīng)用特性·使用空間矢量調(diào)制（Space Vector modulatIOn，SVM）方法產(chǎn)生用于驅(qū)動PMSM電機(jī)各相的正弦電流·正弦電壓與PMSM電機(jī)轉(zhuǎn)子位置同步·四象限運(yùn)行，可實(shí)現(xiàn)正向、反向和制動運(yùn)行·基于數(shù)字比例一積分一微分（Proportional Integral Derivative，PID）控制的閉環(huán)轉(zhuǎn)速控制·相位超前技術(shù)可實(shí)現(xiàn)更寬的調(diào)速范圍·由dsPICODSC的DSP引擎實(shí)現(xiàn)小數(shù)數(shù)學(xué)運(yùn)算
上傳時間： 2022-07-05
上傳用戶：
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