电能脉冲的软件产生方法

Using software to generate electric energy pulse

标准电能脉冲是电子式电能表的重要输出信号,目前多采用电压/频率变换、硬件分频、复杂可编程逻辑器件(CPLD)/现场可编程门阵列器件(FPGA)或专用芯片实现,增加了电路成本及复杂度。提出一种用软件产生标准高低电能脉冲的实用方法,不断累计采样计算所得的瞬时功率值,定时与规定的极限值比较,每达到极限值即输出一个电能脉冲。给出了设计原理、软件流程及一个应用89C51单片机产生标准高低电能脉冲的应用实例。实践证明,利用该方法产生的电能脉冲准确、可靠,并能节约系统资源,可应用于0.1级和0.05级多功能标准电能表中。

As the important output signal of electronic energy meter,the standard electric energy pulse is usually generated by voltage/frequency converter,frequency dividing circuit,CPLD（Complex Programmable Logic Device） / FPGA （Field Programmab le Gate Array） or special chips,being complicated and expensive. A software substitute is proposed. Instantaneous power values calculated from samples are accumulated continuously and compared timely with a given limit value. Electric energy pulse will be generated for every limit value. Its design principle and software as well as the program using 89C 51 to generate high- and low- frequency electric energy pulses are provided. Practices prove that the method is accurate,reliable and economical,which can be used in multi -functional standard energy meters of 0.1 and 0.05 grades.