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  • 基于IR2101最大功率跟蹤逆變器的設計

    為解決直流逆變交流的問題,有效地利用能源,讓電源輸出最大功率,設計了高性能的基于IR2101最大功率跟蹤逆變器,并以SPMC75F2413A單片機作為主控制器。高電壓、高速功率的MOSFET或IGBT驅動器IR2101采用高度集成的電平轉換技術,同時上管采用外部自舉電容上電,能夠穩定高效地驅動MOS管。該逆變器可以實現DC/AC的轉換,最大功率點的跟蹤等功能。實際測試結果表明,該逆變器系統具有跟蹤能力強,穩定性高,反應靈敏等特點,該逆變器不僅可應用于普通的電源逆變系統,而且可應用于光伏并網發電的逆變系統,具有廣泛的市場前景。 Abstract:  To solve the problem of DC-AC inverter, and to utilize solar energy more efficiently, the design of maximum power point tracking inverter based on IR2101 was achieved with a high-performance, which can make the system output power maximum. SPMC75F2413A was adopted as main controller. IR2101 is a high voltage, high speed power MOSFET and IGBT driver. It adopted highly integrated voltage level transforming technology, and an external bootstrap capacitor was used, which could drive MOS tube efficiently and stably. Many functions are achieved in the system, such as DC/AC conversion, maximun power point tracking, etc. The actual test result shows that the inverter system has characteristics of strong tracking ability, high stability and reacting quickly. The design can not only be used in ordinary power inverter system, but also be used in photovoltaic power inverter system. The design has certain marketing prospects

    標簽: 2101 IR 最大功率跟蹤 逆變器

    上傳時間: 2013-11-17

    上傳用戶:lliuhhui

  • 基于微網的光伏變流器系統設計

    光伏發電是未來新能源發電重要方向之一,而光伏變流器是光伏發電系統的核心。介紹一種基于微網理念的光伏變流器設計。以該變流器為核心的光伏發電系統可以看做一個小型的微網系統。該系統能根據外部電網情況,工作于并網模式和離網模式。介紹了該系統的各個組成部件的設計以及變流器主電路部分器件的選型。最后,由實驗樣機進行測試。試驗結果驗證了電路拓撲結構及控制方案的可行性,也說明了系統參數設計方法的正確性。 Abstract:  Solar Photovoltaic generation is an important direction of new energy power generation in the future,while photovoltaic converter is the core of photovoltaic generation system. This paper deals with a study on photovoltaic inverter based on the concept of microgrid. This paper describes a system whose core component is the photovoltaic inverter,can work on grid-connected mode or run independently according to the external situation. The paper simply describes the main components of the system. At last,the prototype was produced and tested. Test result has proved feasibility of circuit topology structure and controlling scheme and shown correctness of system parameters.Key words: PV inverter; microgrid; off-grid; storage battery

    標簽: 光伏 變流器 系統設計

    上傳時間: 2014-12-24

    上傳用戶:Shaikh

  • 基于開關電容技術的鎖定放大器設計

    鎖定放大是微弱信號檢測的重要手段。基于相關檢測理論,利用開關電容的開關實現鎖定放大器中乘法器的功能,提出開關電容和積分器相結合以實現相關檢測的方法,并設計出一種鎖定放大器。該鎖定放大器將微弱信號轉化為與之相關的方波,通過后續電路得到正比于被測信號的直流電平,為后續采集處理提供方便。測量數據表明鎖定放大器前級可將10-6 A的電流轉換為10-1 V的電壓,后級通過帶通濾波器級聯可將信號放大1×105倍。該方法在降低噪聲的同時,可對微弱信號進行放大,線性度較高、穩定性較好。 Abstract:  Lock-in Amplifying(LIA)is one of important means for weak signal detection. Based on cross-correlation detection theory, switch in the swithched capacitor was used as multiplier of LIA, and a new method of correlation detection was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave, then DC proportional to measured signal was obtained through follow-up conditioning circuit, providing convenience for signal acquisition and processing. The measured data shows that the electric current(10-6 A) can be changed into voltage(10-1 V) by LIA, and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the weak signal is amplified. It has the advantages of good linearity and stability.

    標簽: 開關電容 鎖定放大器

    上傳時間: 2013-11-29

    上傳用戶:黑漆漆

  • P89LPC912英文資料

    The P89LPC912/913/914 are single-chip microcontrollers in low-cost 14-pin packages, based on a high performance processor architecture that executes instructions in two to four clocks, six times the rate of standard 80C51 devices. Many system level functions have been incorporated into the P89LPC912/913/914 in order to reduce component count, board space, and system cost.

    標簽: P89 LPC 912 89

    上傳時間: 2013-10-12

    上傳用戶:司令部正軍級

  • 基于單片機系統的(24,16)循環碼編碼、譯碼方案

      在理論分析循環碼編碼和譯碼基本原理的基礎上,提出了基于單片機系統的(24,16)循環碼軟件實現編碼、譯碼的方案。仿真結果表明(24,16)循環碼能有效地克服來自通訊信道的干擾,保證數據通信的可靠及系統的穩定,使誤碼率大幅度降低。本論文對(24,16)循環碼的研究結果表明,可以有效地降低錯誤概率和提高系統的吞吐量,實現糾錯僅需要在接收端增加有限的存儲空間和計算復雜度,具有一定的實用價值。   Abstract:   Based on analyzing the theory of encoding and decoding of cyclic code, this paper showed the schemes of encoding and decoding of(24,16)cyclic code by the software and based on microcontroller. Simulation results show that using (24,16) cyclic codes can effectively overcome the interference from communication channel, ensure the reliability and stability of data communication systems, and reduce the bit error rate greatly. The results of this paper show that by using the (24,16) cyclic code, the error rate can be reduced and the system throughput can be improved. Meanwhile, the system only needs to enlarge limited storage space and computation the complexity at the receiving end to realize error correction. Thus the (24,16) cyclic code has a practical value.  

    標簽: 24 16 單片機系統 循環碼

    上傳時間: 2013-11-09

    上傳用戶:gaoliangncepu

  • 基于89C52的二極管特性測試器的設計

      利用單片機具有的智能程序控制的特點,設計了基于STC89C52單片機的"二極管特性測試器",可對二極管一般特性進行快速測試。通過穩定線性電流源給二極管加載恒定電流,然后由高精度模數轉換器測試其壓降,以此為基礎可判斷二極管好壞、檢測二極管極性和測試二極管伏安特性等,避免了用萬用表測試只能測得極性而不知其特性這一缺點。可用于電子設計制作過程中對二極管進行快速測試,以確定被測二極管是否滿足電路的設計要求。   Abstract:   By making good use of the intelligent control function of the Micro Controller Unit (MCU), the diode trait tester was designed based on the STC89C52,which could be used to test the trait of a diode rapidly. By loading constant current to diode through the stable linear current source, and measuring the voltage drop of the diode by high-precision analogue-to-digital converter (ADC), it can judge whether the diode is good or not, distinguish the polarity of the diode, and test the trait that the diode, which can avoid the fault of using a multimeter can only measure the polarity but not the trait. This device can be used to test the trait of a diode quickly,and to make sure that whether a diode can be used in the electronic design or not.

    標簽: 89C52 二極管 特性測試器

    上傳時間: 2013-11-13

    上傳用戶:assef

  • 基于MSP430單片機的智能水位計設計

      為解決我國水位監測野外條件下長期無人看守的問題,研制開發了基于MSP430單片機的智能水位計。從其組成到各功能分別進行了詳細的介紹,該智能水位計不僅實現了水位數據的實時監測、記錄和定期采集等多種工作模式,而且提高了水位監測精度,實現了水位監測的智能化。   Abstract:   In order to solve the problems of long-term unmanned observation in the field water monitoring,an intelligence water-level meter based on MSP430 is developed composition and every function moduce of the water level meter was introduced in detail. It not only realizes water level data collection and storage, regularly gathering and so on, but also improves the water-level precision , finally realizes the intelligence.  

    標簽: MSP 430 單片機 水位計

    上傳時間: 2013-11-17

    上傳用戶:417313137

  • MAXX9257 MAX9258芯片可編程SerDes持續時間計算

    The MAX9257/MAX9258 programmable serializer/deserializer (SerDes) devices transfer both video data and control signals over the same twisted-pair cable. However, control data can only be transmitted during the vertical blank time, which is indicated by the control-channel-enabled output (CCEN) signal. The electronic control unit (ECU) firmware designer needs to know how quickly to respond to the CCEN signal before it times out and how to calculate this duration. This application note describes how to calculate the duration of the CCEN for the MAX9257/MAX9258 SerDes chipset. The calculation is based on STO timeout, clock frequency, and UART bit timing. The CCEN duration is programmable and can be closed if not in use.

    標簽: SerDes MAXX 9257 9258

    上傳時間: 2014-01-24

    上傳用戶:xingisme

  • 基于AVR單片機的閉環控制系統

      針對科研實驗中對拉壓千斤頂加載過程控制的需要,采用ATmega128單片機控制步進電機進而實現對執行系統的電動泵站實行自動控制。對力和位移的數據采集與處理及用步進電機控制電動泵站手柄的技術細節作了重點描述。通過單片機的A/D變換器對AMP放大模塊采集的電橋信號作量化處理,千斤頂的操控手柄位置依電動油泵閥門開啟的方向和大小作若干定位,單片機根據力或位移傳感器信號,實時控制步進電機驅動手柄旋轉到相應操控位置。   Abstract:   This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing, and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge, jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals, real-time control stepper motor drive control handle rotate to the appropriate location.  

    標簽: AVR 單片機 閉環控制

    上傳時間: 2014-01-16

    上傳用戶:hasan2015

  • 基于PIC18F1320微控制器的信號采集系統

      便攜式信號采集在機器健康診斷系統中有較高的應用價值。機器健康診斷的信號特點是包括低頻信號。本文研究是為了實現簡易而且低成本的低頻便攜式信號采集。以Microchip公司單片機PIC18F1320為核心設計信號采集電路,實現了信號的采集和保存。系統采用串行電可擦除芯片24LC32A保存數據,經過有線通信,信號數據由串行口通過MAX232芯片輸送到微型計算機接收和保存,最后繪制出信號波形。 微型計算機程序采用Visual Basic編程。研究成功采樣頻率為3 kHz的復雜信號,證明該方案符合設計要求。   Abstract:   Portable signal acquisition is useful in machine health monitoring systems. The signal characteristics of machine health monitoring includes low frequency signals. The goal of this study is to realize simple, inexpensive and portable low frequency signal sampling. This paper provides the project of signal acquisition system design based on PIC18F1320 microcontroller manufactured by the Microchip Technology Incorporation to achieve signal sampling and storage. The system adopted EEPROM 24LC32A to store the signal data. The microcomputer received data via wired link with the MAX232 IC through the serial port. The microcomputer program, programmed in Visual Basic, received the data, stored it and plotted the signal. The study successfully samples 3kHz complicated signals and thus meets the design requirement.

    標簽: F1320 1320 PIC 18F

    上傳時間: 2013-11-19

    上傳用戶:moerwang

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