數字式工頻有效值多用表設計

電氣自動化論文編號:ZD531 論文字數:15677,頁數:35，有開題報告，任務書，文獻綜述

目  錄
摘要…………………………………………………………………………………………4
Abstract…………………………………………………………………………………… 5
第一章 總體方案設計與論證…………………………………………………………… 6
第二章 硬件模塊電路設計……………………………………………………………… 7
2.1數據信號采集……………………………………………………………………… 7
 2.1.1數據采集與控制原理……………………………………………………… 7
 2.1.2 數據采集模塊…………………………………………………………………7
2.2 單片機系統數據處理模塊……………………………………………………………8
     2.2.1信號頻率倍頻處理部分……………………………………………………8
     2.2.2數據處理轉換部分…………………………………………………………8
2.3  鍵盤電路設計………………………………………………………………………12
 2.3.1鍵盤電路原理……………………………………………………………12
 2.3.2 器件說明…………………………………………………………………13
2.4  顯示電路設計…………………………………………………………………… 15
 2.4.1 顯示模塊…………………………………………………………………16
 2.4.2 LED電路顯示原理……………………………………………………… 16
第三章 系統實現與理論分析………………………………………………………… 16
3.1采集部分…………………………………………………………………………… 16
3.2數據處理部分……………………………………………………………………… 17
第四章  軟件設計………………………………………………………………………18
4.1 主程序流程圖與說明………………………………………………………………19
4.2 數據處理……………………………………………………………………………20
4.3 鍵盤電路…………………………………………………………………………… 23
4.4 顯示電路…………………………………………………………………………… 25
總結與體會……………………………………………………………………………… 26
致謝……………………………………………………………………………………… 27
參考文獻………………………………………………………………………………… 28
附錄……………………………………………………………………………………… 29
附錄A 各部分設計電路原理圖………………………………………………………… 29
附錄B 總電路圖………………………………………………………………………… 31
附錄C 設計程序………………………………………………………………………… 32

摘要：本系統以8051單片機為核心元件進行設計，采用采樣保持電路同時對電流和電壓信號的瞬時值進行采樣。樣值經模擬開關選擇后送12位A/D轉換電路轉換成數字信號送CPU處理。在地址譯碼邏輯轉換等方面均應用了可編程邏輯器件，為使計算準確在一個工頻周期內采樣50個點，根據實測頻率來確定采樣間隔，然后計算電流、電壓的有效值及有功功率、無功功率。由四位數碼管顯示，通過按鍵實現不同的測量功能。本系統除能達到設計的所有要求外，還有以下擴展功能，策頻、策相，并能策電壓、電流、有功功率、無功功率的最大值及最小值和電壓總諧波的有效值。
 設計分三個模塊：數據采集、數據處理和顯示模塊。數據信號采集采用可編程運算放大器PGA103，對大、小信號分別進行放大處理，采樣控制信號由集成鎖相環ADC0809對被測信號 進行64倍頻產生；數據處理以單片機8051為核心，對采集信號進行精確控制和嚴格計算；顯示部分又74LS164移位寄存器和數碼管構成。
 關鍵詞：數字工頻有效值 80C51單片機 數據采集 數據處理 顯示模塊

 Abstract ：The multi-meter presented here is based on a microprocessor (80C51).All components used are low-cost, high-speed CMOS type. The instantaneous values of the voltage and current can be sampled simulate amorously by two sample-and-hold circuits. The sampled analog signal that can be processed by CPU. The PLD is used for address decoding and logic signal converting. For accuracy calculation .50 points are sampled in a power cycle. The sampling intervals are decided by the measured power frequency.Then,the voltage and current rms valves.active power and reactive power and reactive power are calculated. A 4-place seven-segment LED is used to display the results.The function of the multi-meter can be selected by a keypad.Besides,the functions of the multi-meter can be extended,such as measure ments of frequency,phase,maximum and minimum values of current,voltage,active power and reactive power,and rms values of harmonic voltage.  
 Design branch three modules: Data acquisition 、Data handling and display module. The data signal adopts the programmable to operate amplifier PGA103, To great 、Separately is enlarged the handle to the little signal, The sampling control signal is carried on 64 -fold of frequencies coming into being through integration PLL ADC0809 to fathoms the signal; The data handling takes onboard computer 80C51 as the core, Accurately dominate and rigorously enforce calculation to collecting the signal; Display section but 74LS164's dislocation register and the nixie light constitutes.
 Keywords: figure style workman frequency virtual value；  80C51 signal chip computer；data collect；data processing；display module