基于FPGA的等精度数字转速表设计  

Design of Equal-precision Digital Tachometer Based on FPGA

作　　者：贾石峰[1] 王志云[1] 

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070

出　　处：《兰州交通大学学报》2010年第3期123-126,共4页Journal of Lanzhou Jiaotong University

摘　　要：利用等精度测频原理,设计了基于FPGA的等精度数字转速表.计数部分采用了两个同步的16位计数器,从而无需选择量程便可实现宽频段高精度的频率测量.系统带有转速超限报警、转速过慢和过快报警等功能.整个电路在闸门时间内的总误差只有1/fclk,且在整个量程中具有相同的测量精度.系统在一片FPGA芯片上实现,测量精度高,实时性好,具有灵活的现场可更改性.The equal-accuracy digital tachometer is designed based on FPGA by use of equal-precision frequency measurement theory in this paper.The high-precision measurement and broadband frequency can be achieved without choosing the range because two 16-bit synchronized counters are used in counting part.The system has alarm functions when the speed is overrun,too low or too fast.The total system error is only 1/fclk seconds in gate time,and the same precision can be kept steadily in the whole measuring range.The whole system is realized in a FPGA chip.So it has a high-precision,real-time and flexible change of scene.

关 键 词：等精度 转速表 VHDL FPGA 

分 类 号：TN402[电子电信—微电子学与固体电子学]