以AD637为基础的交流毫伏表设计精选.docVIP

以AD637为基础的交流毫伏表设计 摘 要 本设计是AD637电路的交流毫伏表电路设计。该毫伏表是基于真有效值转换(True RMS-to-DC Converter)技术，以真有效值转换集成AD637为核心，以微控制器（MCU）控制，以高精确度位半A/D转换器为，通过LCD显示，并辅以必要的外围电路设计而成。系统主要由MCU控制模块、程控放大器模块、真有效值转换模块、电压数字显示模块等组成，并且能够根据实际交流电压输入完成相应的量程转换功能，同时使用LCD显示。 该电路采用ICL7135高精度、双积分A/D转换电路，测量范围0-10伏，用LCD液晶显示。正文着重给出了软硬件系统的各部分电路，介绍了双积分电路的原理，89C51特点，ICL7135的功能和应用，LCD1602的功能和应用。该电路设计新颖、功能强大、可扩展性强。 关键词 真有效值ICL7135双积分A/D转换器 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 录 中文摘要 I 英文摘要 II 引 言 1 1 总体方案设计 2 2 3 2.1 真有效值直流变换模块设计方案 3 2.2 4 2.3 模/数转换模块设计方案 4 2.4 LCD显示模块设计方案 5 3 系统硬件电路设计与实现 5 3.1 程控放大器电路设计 5 3.2 真有效值转换电路设计 8 3.3 A/D转换电路设计 10 3.4 单片机最小系统电路设计 13 3.5 液晶显示电路设计 17 3.6 稳压电