基于SOPC的三相信号发生器设计  

Design of Three-phase Signal Generator Based on SOPC

作　　者：朱其新[1] 李辉[1] 杨辉[1] 胡寿松[2] 

机构地区：[1]华东交通大学电气与电子工程学院,南昌330013 [2]南京航空航天大学自动化学院,南京210016

出　　处：《自动化与仪表》2010年第4期16-19,共4页Automation & Instrumentation

基　　金：科技部863项目(2008AA04Z129);国家自然科学基金项目(60964004;60864004;60804066;60904049);浙江省科技厅新苗人才计划项目(2008R40G2030045);江西省自然科学基金项目(2009GZS0014);江西省教育厅资助科研项目(GJJ10456)

摘　　要：产品的品质分析和检验中广泛使用相移信号,对信号源数字化、可靠性、精度和波形带宽等要求越来越高。采用SOPC和直接数字合成技术,在EP2C8T144C8上实现最高频率为100MHz正弦波、方波、三角波和锯齿波信号,方波占空比可调,并利用SOPC设计的NiosⅡ嵌入式处理器控制波形频率及相位差,通过DAC0832控制12位高速DAC902的参考电压实现波形幅度的改变,最小步进0.01V,波形经放大滤波后输出。测试结果显示该系统具有较高的精度,实现了三路任意相位差的相移信号输出并可程控;使信号源在频率范围上拓展到10MHz以上;信号产生及控制等主要电路在一片FPGA内部完成,缩减复杂的外部电路,可靠性强;系统还具有易于修改和升级等特点。Phase-shift signal is widely used in analysis and detection of products,and there are increasing demands of the signal source about digitization, reliability, accuracy and waveform bandwidth. Therefore, focuses on using SOPC and DDS to achieve a maximum frequency of 100MHz sine, square, triangle wave and saw-tooth signal in the EP2C8T144C8. The duty cycle of PWM can be regulated. Then, frequency and phase difference of wave are controlled by Nios II embedded processor. Amplitude of wave also can be changed by the diversification of the reference voltage of high-speed DAC902 through DAC0832, the minimum step is 0.01V. At last waveform is exported after amplification and filtering. The results show that the system has high accuracy and we achieve an arbitrary phase difference three-way phase shift signal output which can be programmed. Moreover, frequency of the signal source has been extended to more than 10MHz. We reduce the complexity of external circuit and complete them in one FPGA, so the system has good reliability. In addition, system is also easy to modify and upgrade.

关 键 词：SOPC 三相 信号发生器 相移 高精度 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]