The software of this device is designed according to module . first it drafts the main block flow chart , then programs subroutine to reach the aim of detecting power theft 設計時對各功能模塊電路進行了仿真驗證,軟件采用模塊化的設計方法,對各個子程序模塊進行設計和調(diào)試,實現(xiàn)竊電的檢測和記錄。
According to the principle of lower cost , higher reliability , the design completes much work . the contents of project are as follows : ( 1 ) pic micro - controller which is lower - power and lower price is the core of control device . the whole circuit realizes the functions of collecting pulse , keeping data , driving electric machinery valve , reading and writing ic , detecting power supply , sound alarm and liquid crystal display 設計依據(jù)低成本,高可靠性的原則完成了以下工作: ( 1 )用功耗低、價格便宜的pic系列單片機作為控制裝置的核心,控制裝置的硬件電路實現(xiàn)了脈沖采集、數(shù)據(jù)存儲、電機閥驅(qū)動控制、 ic卡讀寫、電源檢測以及聲音報警和icd液晶顯示等功能。
Process capability index ( pci ) is also an important method to measure and improve quality , which has play a key role in assuring quality evidence , lowering cost and raising customer satisfaction indexes ( csi ) . this paper studies the applications of pci and control chart from the actual viewpoint , and discusses the applications of the probability a , ( 3 of type i , ii error of the control chart , the detecting power and pci based on x control chart . in addition we explore the relationship between qlf and pci , put forward the concepts of relative loss and loss extent , adopt the linear plan to optimize pci and decide the best loss extent of each process . an example is given )控制圖為例,討論了控制圖的兩類錯誤、檢出力與過程能力指數(shù)在實際中的應用;重要的是討論了質(zhì)量損失與過程能力指數(shù)之間的關系,提出了相對質(zhì)量損失、損失度等概念;研究了多道工序相對質(zhì)量損失、損失度對總質(zhì)量損失的影響,并從質(zhì)量損失的角度出發(fā),采用線性規(guī)劃的方法,優(yōu)化多工序的過程能力指數(shù),確定各道工序的最佳損失度,實證討論了這種關系,同時可以利用這種關系對供應商進行評價,給出了從全局的、動態(tài)的角度選擇供應商的方法,為上下游企業(yè)間的配合、監(jiān)督及共同進步提供了理論基礎和實現(xiàn)途徑。
Single chip needs too much time to calculate and we ca n ' t detect power quality real time for example , and the sampling rate must synchronize the signal frequency . when sample multi - channel signal in turn , it must have time delay between two samplings , so the phase angle difference between each channel signal is ca n ' t be avoid and so on . those problems must be solved 本課題分析了目前電能質(zhì)量的各種檢測方法,認為快速傅氏算法( fft )是首選方法,但是基于定時采樣的fft計算會產(chǎn)生頻譜泄漏,為了減少這個泄漏需要進行加窗處理,這需要增加采樣數(shù)據(jù),導致顯著增大計算量。