【作者】 周海军；

【导师】 张卫平；

【作者基本信息】 上海交通大学 ， 微电子学与固体电子学， 2008， 硕士

【摘要】 近年来,随着微电子机械技术被广泛地应用于微机械陀螺之中,静电悬浮转子微陀螺得到国内外的深入研究。静电悬浮转子微陀螺利用高速旋转转子的陀螺效益,来实现对载体运动角速度的测量,并可同时实现线加速度的测量。载体的角速度和线加速度通过陀螺的差分电容结构被转化为相应的电容变化,进而转化为相应的电信号输出。检测陀螺角速度和线加速度被转化为检测相应的差动电容。根据静电悬浮转子微陀螺的差分电容结构特点,本文主要探讨了如何使用数字信号处理技术,在数据处理芯片(DSP)平台下来实现静电悬浮转子微陀螺的检测及控制。本文的主要研究内容和成果如下:首先,介绍了静电悬浮转子微陀螺的电容结构和工作原理,以及陀螺角运动和线运动的动力学方程。讨论利用数字信号处理技术及DSP处理器来对静电悬浮转子微陀螺进行信号检测和控制。其次,介绍了数字解调原理,结合静电悬浮转子微陀螺的结构特点,提出使用自相关算法来实现陀螺信号检测。构建了一个基于DSP的同步幅值解调检测系统,经实验,该系统能够满足静电悬浮转子微陀螺的信号检测要求。最后,为了实现对静电悬浮转子微陀螺的闭环控制,设计了一个使用增量式PID算法的控制器,并在VC33DSP开发平台下,使用该控制器算法开发了一个能用于对静电悬浮转子微陀螺进行闭环控制的可视化控制系统。该控制系统主要是对VC33DSP开发系统的外设A/D、D/A和PCI芯片进行编程应用。具体为:使用VC++编写的用于进行数据和命令传递的可视化界面,对CY7C09449PCI芯片编程实现DSP与PC之间通信,使用VC33DSP汇编语言编写增量式PID算法以及对实现数据输入、输出的A/D、D/A的应用编程。经实验,整个系统运行良好,PID控制器的参数可以便捷地修改,且能实时地掌握控制器的效果,这为对静电悬浮转子微陀螺的五路闭环控制提供了一种有效的方法。本文的检测和控制系统优点在于:(1)对于信号检测,在DSP中使用自相关算法,避免了模拟幅值解调需要提供同频载波参考信号的难题,同时也避免了使用模拟器件带来的频率误差和相位误差。(2)对于闭环控制,可视化的控制能及时掌握控制效果,并根据需要及时调整控制参数。(3)无论对于信号检测还是闭环控制,通过对检测和控制算法的复制修改就能实现多路检测和控制,方便了静电悬浮转子微陀螺的多路检测和控制。更多还原

【Abstract】 Recently, with the wide use of micro-electro-mechanical(MEMS) technology in the field of a micromechanical gyroscope, a novel micromachined gyroscope with an electrostatically suspended rotor is being studied deeply at home and abroad. Employing gyroscopic effect of the high speed rotational rotor, a micromachined electrostatically suspended gyroscope can detect the angular rate and the linear acceleration of the carrier.By means of the differential capacitance of the microgyro, the angular rate and acceleration of the carrier are then transferred into the capacitive alteration related, furthermore, into electrical output. According to the differential capacitance of the gyroscope, The thesis mainly discusses the related techniques of detection and control of the microgyro by using the method of the digital signal processing and DSP chipThe main research content and results of this thesis are as follows:Firstly, this paper introduces the capacitive structure and the working principle of the micromachined electrostatically suspended gyroscope. The dynamical equations of microgyro in angular and linear movement are also given .it discusses the detection and control of the microgyro with the technology of digital signal processing. Secondly, it shows the principle of digital demodulation. Given the structure of this microgyro, the algorithm of autocorrelation detection is used to detect its signal.A synchronous amplitude detection system, which is based on DSP, is constructed .Proved by the experiment, this system can meet the demand of the detection of the micromachined electrostatically suspended gyroscope.Finally, the incremental PID controller is designed in order to achieve the close loop-control for this microgyro. Based on the development platform of VC33 DSP, a visual control system with the PID control algorithm is developed. To construct the system ,the major tasks are to program application codes about the peripheral chips of VC33 DSP, which are the MAX125 chip、the DAC7724 chip and the CY7C09449PV chip. This system mainly includes the following parts: A visual interface with VC++, which can transfer the data and commands.is Programmed by using VC++, A communication in PC and DSP is attained by programming the application codes to develop CY7C09449 chip . Using the specific Assembly language for VC33, the codes achieving the incremental PID controller is written. It also includes the application codes for A/D chip and D/A chip to obtain the function of input and output of the data processed. Proved by the experiment, this visual control system can run effectively. In this system, parameters of PID controller can changed swiftly and the result of PID controller can be seen in real-time. Consequently, it provides the effective method to complete the five channels close-loop control for the micromachined electrostatically suspended gyroscope.The control system discussed in this thesis has some main advantages below:(1) About the detection, the difficulty of giving a carrier frequency with the same frequency in the technology of analog amplitude demodulation can be avoided in this detection system which is based on the correlate algorithm using DSP. It also can avoid the frequency error and the phase error brought by analog devices concerned. (2) About the close-loop control system, the visual control can master the control result timely. It also can change the control parameters in time. (3)Both signal detection and close-loop control, it is easier to achieve multiple channels detection and control by copying and modifying algorithms of signal detection and close-loop control concerned.更多还原