摘要
介绍了基于DSP的微机继电保护装置中频率测量的CPLD实现。分析、比较了测频率法、测周期法、等精度测频法等几种常用测频方法的原理及误差。着重介绍了测频系统中CPLD的设计与实现,给出了CPLD中的各功能模块,并且给出了频率测量的VHDL语言描述。由于采用了CPLD芯片来实现频率的测量,因而具有高集成度、高速性及高可靠性等优良特点。
This paper introduces CPLD realization of frequency measure in digital relay protection equipment powered by DSP. The differences of principle and precision between frequency measurement method, cycle measure method, and equivalent precision frequency measurement method are compared. CPLD design and realization in the frequency measurement system are detailed, every functional module of CPLD is given,and the VHDL language description of hardware realization of frequency measure is presented. The merit of high integration, high speed, and high reliability in frequency measurement brought by adopting CPLD chip in composition of system is illustrated.
出处
《继电器》
CSCD
北大核心
2005年第20期19-22,共4页
Relay
