以AD637為基礎(chǔ)的交流毫伏表設(shè)計(jì)

摘  要

本設(shè)計(jì)是基于AD637電路的交流數(shù)字毫伏表電路設(shè)計(jì)。該毫伏表是基于真有效值轉(zhuǎn)換(True RMS-to-DC Converter)技術(shù)，以真有效值轉(zhuǎn)換集成芯片AD637為核心，以微控制器（MCU）為量程轉(zhuǎn)換控制，以高精確度四位半A/D轉(zhuǎn)換器為模數(shù)轉(zhuǎn)換，通過LCD顯示，并輔以必要的外圍電路設(shè)計(jì)而成。數(shù)字交流毫伏表系統(tǒng)主要由MCU控制模塊、程控放大器模塊、真有效值轉(zhuǎn)換模塊、電壓數(shù)字顯示模塊等組成，并且能夠根據(jù)實(shí)際交流電壓輸入完成相應(yīng)的量程轉(zhuǎn)換功能，同時(shí)使用LCD顯示測(cè)試電壓值。
該電路采用ICL7135高精度、雙積分A/D轉(zhuǎn)換電路，測(cè)量范圍在0-10伏的交流信號(hào)，用LCD液晶顯示。正文著重給出了軟硬件系統(tǒng)的各部分電路，介紹了雙積分電路的基本原理，89C51最小系統(tǒng)的特點(diǎn)，ICL7135的功能和應(yīng)用，LCD1602的功能和應(yīng)用。該電路設(shè)計(jì)新穎、功能強(qiáng)大、可擴(kuò)展性強(qiáng)。

關(guān)鍵詞 真有效值 數(shù)字顯示 ICL7135雙積分A/D轉(zhuǎn)換器 1602液晶

TO AD637 MV BASED ON THE DESIGN
OF EXCHANGE

ABSTRACT

The AD637 circuit design is based on the exchange of digital circuit design Millivoltmeter. The table is based on the mV RMS conversion (True RMS-to-DC Converter) technology to TRMS AD637 converter chip as the core, microcontroller (MCU) for the change of control of range, high precision 4 half A / D converter for analog-to-digital conversion, through the LCD display, supplemented by the necessary from the external circuit design. Digital AC millivolt meter system mainly by the MCU control module, program-controlled amplifier module, True RMS conversion module, voltage digital display module, such as composition,And can in accordance with the actual AC voltage input range corresponding to complete conversion, at the same time using the LCD display test voltage value.
ICL7135 precision of the circuit, double-integrating A / D conversion circuit, surveying the range of 0-10 V ac signal, the LCD liquid crystal display. Given body of hardware and software systems focused on different parts of the circuit, introduced the double-integrating the basic principles of circuit, 89C51 minimum system characteristics, ICL7135 function and application, LCD1602 functions and applications. The circuit design of novel, powerful and highly scalable.

KEY WORDS  true rms digital display icl7135 double integral a/d converter 1602 lcd

 
目 錄
中文摘要 I
英文摘要 II
引 言 1
1 總體方案設(shè)計(jì) 2
2 技術(shù)方案論證與比較 3
2.1 真有效值直流變換模塊設(shè)計(jì)方案 3
2.2 程控放大器模塊設(shè)計(jì)方案 4
2.3 模/數(shù)轉(zhuǎn)換模塊設(shè)計(jì)方案 4
2.4 LCD顯示模塊設(shè)計(jì)方案 5
3 系統(tǒng)硬件電路設(shè)計(jì)與實(shí)現(xiàn) 5
3.1 程控放大器電路設(shè)計(jì) 5
3.2 真有效值轉(zhuǎn)換電路設(shè)計(jì) 8
3.3 A/D轉(zhuǎn)換電路設(shè)計(jì) 10
3.4 單片機(jī)最小系統(tǒng)電路設(shè)計(jì) 13
3.5 液晶顯示電路設(shè)計(jì) 17
3.6 穩(wěn)壓電源的設(shè)計(jì) 20
3.7 報(bào)警電路設(shè)計(jì) 22
4 軟件程序設(shè)計(jì) 23
4.1 量程自動(dòng)轉(zhuǎn)換程序設(shè)計(jì) 23
4.2 數(shù)據(jù)處理程序設(shè)計(jì) 24
4.3 液晶顯示模塊程序設(shè)計(jì) 26
5 系統(tǒng)調(diào)試 27
5.1 硬件調(diào)試 27
5.2 軟件調(diào)試 28
總結(jié) 28
致  謝 29
參考文獻(xiàn) 30
附  錄 31