分类号学号641810200671486 学校代号10487 密级
硕士学位论文
基于MAX1452补偿压力传感器
量产系统设计
学位申请人:朱红卫
学科专业:通信与信息系统
指导教师:卢益民教授
答辩日期:2008年5月30日汽车压力传感器
A Thesis Submitted in Partial Fulfillment of the Requirements
for the Degree of Master of Engineering
The Design of Mass Production System of Pressure Sensor based on MAX1452 Compensation
Candidate: Zhu Hongwei
Major : Communication & Information System Supervisor: Prof. Lu Yimin
Huazhong University of Science and Technology
Wuhan, Hubei 430074, P. R. China
May, 2008
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摘要
对于广泛应用于压力测量的压阻式传感器,由于所用的半导体材料的固有特性,普遍存在着:一致性、温度漂移和非线性等问题。在使用时都要经过输出信号的补偿与矫正过程。
本文首先对压阻式传感器的校准和温度补偿进行了分析,并围绕信号调理技术的发展,介绍了MAXIM公司的MAX1452信号调理芯片,对MAX1452的模拟信号调理和数字调理电路进行了介绍。
MAX1452集信号处理、温度补偿于一体,通过温度传感器检测环境温度,温度值经A/D转换作为地址指针,通过调用此地址所指的零点和满量程的补偿温度系数,经D/A转换后对传感器输出零点和满量程的温度漂移进行修正。
传统的补偿系统一次只能对一个压力传感器进行补偿,而且所有的补偿过程都需要人工手动完成。考虑到汽车电子等工业对高精度压力传感器的大量需求,对单模块操作的补偿系统效率太低。本文在充分研究补偿技术的基础上,以MAX1452为核心,设计开发了可挂载多个模块,对多个模块同时编程的补偿系统,即基于MAX1452补偿的压力传感器量产系统,一次可同时完成对多个压力传感器的补偿,即完成了精密传感器的批量生产。
论文中给出了补偿量产系统的总体方案、硬件电路的设计,并着重介绍了量产系统软件的设计与实现。
本系统设计方法简单,功能全面,经软、硬件调试及现场测试后,运行稳定、可靠。功能和性能也基本达到设计要求,可完成高精度压力传感器的批量生产,在工业生产领域有着广泛的应用前景。
关键词:MAX1452 温度补偿压力传感器量产系统单片机
Abstract
Piezoresistive sensors are widely used for pressure measure. The inherent characteristics of the semiconductor lead to the consistency, temperature shift and non-linearity. Therefore, compensation and calibration are needed for the output voltage of the piezoresistive sensors.
This thesis first analyzed the calibration and temperature compensation of the piezoresistive sensor. Then, based on the development of the signal process technology, the signal processor MAX1452 made in MAXIM Company, the analog signal processing and digital processing circuit of it is introduced.
Multiple functions, including signal process and temperature compensation, are integrated into MAX1452. It acquires environmental temperature parameter from temperature sensors, converts it into
address pointer by A/D converter, which points to the origin and the full-range temperature coefficient of compensation. By calling that pointed address, the origin and the full-range temperature shift outputted by the sensor can be calibrated after D/A converter.
The traditional compensation system finishes the compensation once on only one pressure sensor, and all the compensation process is manual. As the demands of the high-precision pressure sensors greatly increased in the industry such as automotive electronics, the efficiency of the traditional compensation system is too low. On the basis of the summary on the compensation technology, introducing MAX1452 as the core, a compensation system, which can load and program with multiple modules, is designed and implemented in this thesis, which means the pressure sensor compensation system based on MAX1452, can finish the compensation on multiple pressure sensors and implement the mass process of the high-precision sensors.
In this thesis, the design summary of the compensation system, the hardware circuit,