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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解析继电器不断开是什么原因

2013/11/21 12:31:57点击:
    解析继电器不断开是什么原因?继电器是一种电控制器件,是当输入量(激励量)的变化达到规定要求时,在电气输出电路中使被控量发生预定的阶跃变化的一种电器。

  解析继电器不断开是什么原因

  1、负载电流大于SSR的额定切换电流,这样会使继电器永久短路,此时应使用额定电流较大的SSR。

  2、在继电器所处的环境温度下,对于所承受的电流来说如散热不良,会损坏输出半导体器件,此时应使用较大的或更有效的散热片。

  3、线电压瞬变引起SSR输出部分穿通,此时应使用额定电压较高的SSR或提供额外的瞬态保护电路。

  4、使用的线电压高于SSR的额定电压。