Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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DTSF、DSSF三相电子式多费率电能表工作原理

2014/3/11 8:29:28      点击:

DTSF、DSSF三相电子式多费率电能表 工作原理2.1 电能计量单元工作原理本仪表电能计量单元的核心是ADE7755芯片。被计量的每一相电能的电流通过互感器采样得到电压信号,再通过ADE7755芯片内部的差放电路将电压信号放大,放大的信号经过A/D转换成与其成比例的数字信号,再经过高通滤波去除信号中的直流分量后进入数字乘法器的一个输入端。被计量的电能电压信号经过电阻分压取样,通过ADE7755芯片内部的差放电路将信号放大,再经过A/D转换成与其成比例的数字信号,进入数字乘法器的另一个输入端与电流通道的信号进行乘法运算,完成计量电能的瞬时功率测量。每相输出瞬时功率通过数字低通滤波器,进行积分处理,然后进行绝对值累加后进入"数字/频率"转换器,经过分频电路输出的脉冲经过隔离后送入CPU单元进行处理。2.2 CPU单元工作原理电能计量单元输出的高频脉冲通过光电耦合器,一路作为无源脉冲输出用于出厂检验和用户对电能表进行校验;另一路送到CPU芯片进行数据处理。CPU在系统(电能表程序)指令下,根据数据存储器中的记忆及仪表常数计算出有功的电量值,再转存到内部存储器中,存储的数据既可以通过液晶LCD显示, 又可以通过红外和RS485两种通迅方式输出。