IC693CPU323
IC693CPU323聯(lián)系人：李先生
手機(jī)：18030229050
電話：0592-5709821
傳真：0592-5709828
QQ 1878187406
郵箱 1878187406@qq.com
IC693CPU323
畫好圖發(fā)出去，等PCB板收到后焊好元件發(fā)現(xiàn)，調(diào)節(jié)信號(hào)源的輸出能改變電機(jī)的轉(zhuǎn)速，我以為已經(jīng)成功了。但是我發(fā)現(xiàn)一個(gè)問題，PWM信號(hào)是通過電纜接到驅(qū)動(dòng)板上的，如果PWM信號(hào)的輸入端懸空，電機(jī)馬上就全速轉(zhuǎn)動(dòng)。這當(dāng)然是不希望出現(xiàn)的，我把這個(gè)情況告訴了老師。然后和老師討論解決方案。通過讓用戶先給控制板上電再給驅(qū)動(dòng)板上電，倒是可以避免沒有控制信號(hào)電機(jī)就全速轉(zhuǎn)動(dòng)的尷尬。我提議再加一級(jí)反相器。這些都不像是很好的辦法。最后，老師看了電路圖幾分鐘，說去掉一級(jí)三極管就可以了。就這樣我以為要返工的電路通過在PCB上簡單的修改就又能達(dá)到輸入端懸空的時(shí)候，電機(jī)不轉(zhuǎn)的效果了，見下圖。為保險(xiǎn)起見，又加上了保險(xiǎn)絲。雖然mos有電壓的時(shí)候沒電流，有電流的時(shí)候沒電壓，功率不大，以防萬一又加上了散熱片。
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