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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    固態(tài)繼電器

    2019/8/22 9:11:31      點擊:
    固態(tài)繼電器由三部分組成:輸入電路,隔離(耦合)和輸出電路。

    輸入電路

    按輸入電壓的不同類別,輸入電路可分為直流輸入電路,交流輸入電路和交直流輸入電路三種。有些輸入控制電路還具有與TTL/CMOS兼容,正負邏輯控制和反相等功能,可以方便的與TTL,MOS邏輯電路連接。
    對于控制電壓固定的控制信號,采用阻性輸入電路?刂齐娏鞅WC在大于5mA。對于大的變化范圍的控制信號(如3~32V)則采用恒流電路,保證在整個電壓變化范圍內電流在大于5mA可靠工作。

    隔離耦合

    固態(tài)繼電器的輸入與輸出電路的隔離和耦合方式有光電耦合和變壓器耦合兩種:光電耦合通常使用光電二極管—光電三極管,光電二極管—雙向光控可控硅,光伏電池,實現(xiàn)控制側與負載側隔離控制;高頻變壓器耦合是利用輸入的控制信號產生的自激高頻信號經(jīng)耦合到次級,經(jīng)檢波整流,邏輯電路處理形成驅動信號。

    輸出電路

    SSR的功率開關直接接入電源與負載端,實現(xiàn)對負載電源的通斷切換。主要使用有大功率晶體三極管(開關管-Transistor),單向可控硅(Thyristor或SCR),雙向可控硅(Triac),功率場效應管(MOSFET),絕緣柵型雙極晶體管(IGBT)。固態(tài)繼電器的輸出電路也可分為直流輸出電路,交流輸出電路和交直流輸出電路等形式。按負載類型,可分為直流固態(tài)繼電器和交流固態(tài)繼電器。直流輸出時可使用雙極性器件或功率場效應管,交流輸出時通常使用兩個可控硅或一個雙向可控硅。而交流固態(tài)繼電器又可分為單相交流固態(tài)繼電器和三相交流固態(tài)繼電器。交流固態(tài)繼電器,按導通與關斷的時機,可分為隨機型交流固態(tài)繼電器和過零型交流固態(tài)繼電器。
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