毕业设计（论文）-基于DDS技术三相正弦信号发生器的设计与实现.doc

基于DDS技术三相正弦信号发生器的设计与实现
中文摘要
本设计是基于EDA技术,在Quartus II开发平台上,采用自顶向下的设计方法设计,主芯片采用EP2C5T144C8。以在FPGA中嵌入的8051单片机软核为控制核心,设计完成了基于DDS技术三相正弦信号发生器的制作。
论文详细讨论了正弦信号和调制信号的产生、频率精确控制、三路移相输出、D/A转换与四阶巴特沃思低通滤波电路、电流电压转换电路、4*4键盘与lcd12864显示器等诸方面软硬件实现方法。嵌入的8051单片机软核负责界面显示、键盘扫描和频率与相位控制字的串行输出。
系统可输出三相正弦波和调制信号波。调制信号频率在100Hz~1kHz频率范围内可任意预置,正弦波频率在1Hz~30KHz范围内任意预置,两相间的相位差在0~359°任意预置。根据输入频率大小不同,分别有1Hz、10Hz和100Hz步进值,相位步进值为1°。
综合测试证明,%,移相精度达到1度,在10kΩ负载电阻上的电压峰-峰值Vopp≥10V。
关键词:低频三相;FPGA;DDS;8051单片机软核;移相
The Design and Implementation of Three-phase Sinusoidal Signal Generator Based on DDS Technology
Abstract
The design is based on EDA technology and development platform in the Quartus II with the use of top-down design method, the main chip is EP2C5T144C8. Embedded in the FPGA with 8051 soft-core for the control of the core, the design pleted the Three-phase Sinusoidal Signal Generator Based on DDS Technology.
This article discusses in detail various aspects of hardware and software implementations, such as the creation of sinusoidal signal generator and FM signal, the precision control of frequency, the dual phase-shifted output, the circuit of D / A conversion and fourth-order Butterworth low-pass filter, the converter of current-voltage, 4 * 4 keyboard and lcd12864 displays and so on. The embedded 8051 microcontroller soft-core is responsible for interface display, keyboard scanning, and the serial output of the frequency control word and phase control word.
The system can output three-phase sine-wave and FM signal wave. The modulation frequency can be arbitrarily preset in 100Hz ~ 1kHz, The sine wave frequency can be arbitrarily preset in 1Hz ~ 30KHz, The phase difference between any two phases can be arbitrarily preset in 0 ~ 359 °. According to the different input frequency, there are 1Hz、10Hz and 100Hz step value, and the phase step value is 1 °.
prehensive test shows that the accuracy of the frequency is %, the accuracy of phase moving is 1 degree, and the Vopp in the