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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
參考價 | 面議 |
聯(lián)系方式:張亮查看聯(lián)系方式
更新時間:2015-03-05 14:53:11瀏覽次數(shù):223
聯(lián)系我們時請說明是泵閥商務(wù)網(wǎng)上看到的信息,謝謝!
140DAI55300---140DAI55300
140DAI55300---140DAI55300
對于晶體管或繼電器輸出型PLC,可在惑性負(fù)載兩端并聯(lián)保護(hù)二極管。以圖 ( a)為例,當(dāng)晶體管由導(dǎo)-通轉(zhuǎn)為截止時,感性負(fù)載兩端馬上產(chǎn)生很高的左負(fù)右正辰峰電壓,該電壓 通過屯源加到晶體管兩端,易擊穿晶體管。并聯(lián)保護(hù)二極管(如1N4001 )后.感性位載兩端 的反峰電壓使二極管導(dǎo)通.反峰電壓迅速降低。如果需要提高晶體管的關(guān)斷速度,可在保護(hù)二極管兩端再串接一個穩(wěn)壓二極管,如圖(b)所示;對于繼電器輸出型PLC,也可在感性 負(fù)載兩端并聯(lián)RC元件,如圖( c )所示。反峰電呀因?qū)C元件充電,其值會迅速降低。
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