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quality

  • 基于ARMLinux嵌入式電能質量監測儀的研究與設計

    大量的電力電子裝置及非線性負荷在電力系統中廣泛的應用,使電能質量(Power quality)問題日益突出。電能質量問題不僅危害電力系統本身的安全及電網的穩定運行,對系統中用戶也造成嚴重威脅。因此,對電能質量的實時監測具有十分重要的意義。 論文首先介紹了電能質量的概念,分析了國內外電能質量監測的研究現狀及開發新型電能質量監測裝置的意義,同時對影響電能質量的指標參數的數字測量原理與算法進行了深入的研究。在此基礎上,提出了以ARM9(s3c2410)芯片為CPU,以嵌入式Linux為軟件核心的電能質量監測裝置的總體設計思想。 論文建立了基于arm-1inux的嵌入式開發環境,完成了基本的硬件電路設計和軟件設計。硬件設計方面,根據電力系統中數據采集和處理的實際特點,在前置測量采集模塊中,采用了ADS7864芯片設計了多通道信號采樣保持和快速轉換電路;利用鎖相環保證了多路信號的硬件同步采樣;在通訊方式上,除了采用RS-232通訊方式外,還采用了以太網和USB通訊方式,從而提高了裝置應用的靈活性。軟件設計方面,依據裝置所要實現的功能,剪裁并成功移植了嵌入式linux內核到ARM處理器中;完成了各應用程序的編制,給出了詳細的程序流程圖;設計了基于Qt/Embedde的人機交互界面(GUI)。 基于arm-linux嵌入式電能質量監測儀不僅數據處理功能強、人機交互性好、系統升級簡單、還能進行遠程監控。在此基礎上可進一步開發,向微型化、高度智能化等方向發展,以滿足不同場合的需求,具有較大的使用價值和廣闊的應用前景。

    標簽: ARMLinux 嵌入式 電能質量 監測儀

    上傳時間: 2013-05-16

    上傳用戶:frank1234

  • 什么時候校準是重要的

    Abstract: Perfection is relative and application specific. The perfect race car is not the car we use to commute to work. We need products for everyday use that are high quality, affordable, and solidly reliable. There will be times when we must use components that are not perfect, and this is when calibration becomes important. Calibration techniques reduce tolerances in imperfect manufacturing equipment while maintaining affordability.

    標簽: 校準

    上傳時間: 2013-10-09

    上傳用戶:哈哈hah

  • Analog Circuit Design in Porta

    •Founded in Jan. 08, 2001 in Shanghai, China.•Fabless IDH focused on Analog & Mixed Signal Chip design & marketing •Over 100 IC introduced.•Over 200 OEM Customer worldwide•ISO-9000 Certified•Distribution Channel in Taiwan, China & Japan To achieve 100% customer satisfactionby producing the technically advanced product with the best quality, on-time delivery and service. Leverages on proprietary process and world-class engineering team to develop innovative & high quality analog solutions that add value to electronics equipment.

    標簽: Circuit Analog Design Porta

    上傳時間: 2013-10-24

    上傳用戶:songnanhua

  • Active Filters

    Power conversion by virtue of its basic role produces harmonics due to theslicing of either voltages or currents. To a large extent the pollution in theutility supply and the deterioration of the power quality has been generatedor created by non-linear converters. It is therefore ironic that power convertersshould now be used to clean up the pollution that they helped to create inthe first place.In a utility system, it is desirable to prevent harmonic currents (which resultin EMI and resonance problems) and limit reactive power flows (whichresult in transmission losses).Traditionally, shunt passive filters, comprised of tuned LC elements andcapacitor banks, were used to filter the harmonics and to compensate forreactive current due to non-linear loads. However, in practical applicationsthese methods have many disadvantages.

    標簽: Filters Active

    上傳時間: 2013-11-05

    上傳用戶:AISINI005

  • DN445微型模塊LED驅動器

      Once relegated to the hinterlands of low cost indicatorlights, the LED is again in the spotlight of the lightingworld. LED lighting is now ubiquitous, from car headlightsto USB-powered lava lamps. Car headlights exemplifyapplications that capitalize on the LED’s clear advantages—unwavering high quality light output, tough-assteelrobustness, inherent high effi ciency—while a USBlava lamp exemplifi es applications where only LEDs work.Despite these clear advantages, their requirement forregulated voltage and current make LED driver circuitsmore complex than the venerable light bulb, but some newdevices are closing the gap. For instance, the LTM®8040μModule™ LED driver integrates all the driver circuitryinto a single package, allowing designers to refocus theirtime and effort on the details of lighting design criticalto a product’s success.

    標簽: 445 LED DN 微型模塊

    上傳時間: 2013-10-16

    上傳用戶:togetsomething

  • Power quality and Energy Manag

    International reference list 02/2004International referenceJ.JaatinenCompany CountryBerlin GermanyDeutsche Flugsicherung GermanyFrankfurt GermanyGuangzhou ChinaHamburg GermanyHelsinki-Vantaa FinlandKuala Lumpur - Sepang MalaysiaZürich Switzerland

    標簽: quality Energy Power Manag

    上傳時間: 2013-10-30

    上傳用戶:1184599859

  • MAX7456在可視倒車雷達中的應用

    為解決傳統可視倒車雷達視頻字符疊加器結構復雜,可靠性差,成本高昂等問題,在可視倒車雷達設計中采用視頻字符發生器芯片MAX7456。該芯片集成了所有用于產生用戶定義OSD,并將其插入視頻信號中所需的全部功能,僅需少量的外圍阻容元件即可正常工作。給出了以MAX7456為核心的可視倒車雷達的軟、硬件實現方案及設計實例。該方案具有電路結構簡單、價格低廉、符合人體視覺習慣的特點。經實際裝車測試,按該方案設計的可視倒車雷達視場清晰、提示字符醒目、工作可靠,可有效降低駕駛員倒車時的工作強度、減少倒車事故的發生。 Abstract:  A new video and text generation chip,MAX7456,was used in the design of video parking sensor in order to simplify system structure,improve reliability and reduce cost. This chip included all the necessary functions to generate user-defined OSDs and to add them into the video signals. It could be put into work with addition of just a small number of resistances and capacitors. This paper provided software and hardware implementation solutions and design example based on the chip. The system had the characteristics of simplicity in circuit structure,lower cost,and comfort for the nature of human vision. Loading road test demonstrates high video and text display quality and reliable performance,which makes the driver easy to see backward and reduces chance of accidents.

    標簽: 7456 MAX 可視倒車 中的應用

    上傳時間: 2013-12-10

    上傳用戶:qiaoyue

  • MT8870D DTMF解碼芯片

    Features• Complete DTMF Receiver• Low power consumption• Internal gain setting amplifier• Adjustable guard time• Central office quality• Power-down mode• Inhibit mode• Backward compatible withMT8870C/MT8870C-1Applications• Receiver system for British Telecom (BT) orCEPT Spec (MT8870D-1)• Paging systems• Repeater systems/mobile radio• Credit card systems• Remote control• Personal computers• Telephone answering machine

    標簽: 8870D 8870 DTMF MT

    上傳時間: 2013-11-20

    上傳用戶:mpquest

  • WP196-平面顯示器中的Xilinx器件

      According to CIBC World Markets, Equity Research, theFlat Panel Display (FPD) industry has achieved sufficientcritical mass for its growth to explode. Thus, it can nowattract the right blend of capital investments and R&Dresources to drive technical innovation toward continuousimprovement in view quality, manufacturing efficiency,and system integration. These in turn are sustainingconsumer interest, penetration, revenue growth, and thepotential for increasing long-term profitability for industryparticipants. CIBC believes that three essential conditionsare now converging to drive the market forward

    標簽: Xilinx 196 WP 平面顯示器

    上傳時間: 2013-10-18

    上傳用戶:日光微瀾

  • PCB設計軟件ExpressPCB 下載

    ExpressPCB 是一款免費的PCB設計軟件,簡單實使。可以畫雙層板。 Our Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional.   Our board manufacturing service makes top quality two and four layer PCBs. Use our MiniBoard service and pay only $51 for three boards (plus $8 shipping).

    標簽: ExpressPCB PCB 設計軟件

    上傳時間: 2013-11-15

    上傳用戶:lchjng

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