2003年,第7期,類別:電子制作
????本遙控開(kāi)關(guān)僅用了5只三極管,整個(gè)電路可裝在尺寸僅40mm×50mm的電路板上,能對(duì)各種電器進(jìn)行遙控開(kāi)/關(guān)操作,電路見(jiàn)附圖。所使用的遙控發(fā)射器是普通家電遙控器。接收控制電路只要按圖正確焊接,無(wú)須調(diào)試即可成功。
????IR為紅外線遙控接收頭,未接收到紅外線信號(hào)時(shí),①腳輸出高電平,接收到紅外線信號(hào)時(shí),①腳輸出一連串低電平脈沖。R4、C2與R7、C3組成兩個(gè)積分電路,Q4、Q5、J組成繼電器控制電路,C5、D5~D8組成交流降壓整流電路。平時(shí)待機(jī)或上電后的初始狀態(tài)是:Q1導(dǎo)通,Q2截止,Q5截止,繼電器J不工作。
????遙控開(kāi)機(jī)過(guò)程,短按遙控器按鈕(小于0.5秒),在這較短的時(shí)間內(nèi),因C3容量遠(yuǎn)大于C2,故B點(diǎn)電位很快升到高電位(約1V左右),而A點(diǎn)電位上升不到0.6V,因此Q3不能導(dǎo)通,只有Q2導(dǎo)通,這樣,C點(diǎn)為高電位,Q5導(dǎo)通,繼電器J動(dòng)作,其接點(diǎn)J-1、J-2同時(shí)吸合,J-2接通電器電源。這時(shí)即使IR不再收到信號(hào),因電源經(jīng)R11向Q5提供偏置,故Q5保持導(dǎo)通,J仍繼續(xù)吸合,達(dá)到短按遙控鈕實(shí)現(xiàn)開(kāi)機(jī)的目的。
????遙控關(guān)機(jī)過(guò)程:長(zhǎng)按遙控器按鈕(3秒以上)時(shí),IR輸出低電平脈沖使Q1輸出高電平脈沖,經(jīng)D1整流后送至A點(diǎn)、B點(diǎn)進(jìn)行積分處理,最終使A點(diǎn)電位大于1V(實(shí)測(cè)為1.3V左右),Q3導(dǎo)通,D點(diǎn)為高電平,Q4導(dǎo)通,C點(diǎn)為低電平,致使Q5截止,J釋放,J-1、J-2斷開(kāi),達(dá)到長(zhǎng)按遙控鈕實(shí)現(xiàn)關(guān)機(jī)的目的。松開(kāi)遙控鈕后,IR不再收到紅外線信號(hào),C2、C3放電,Q2、Q3截止,電路又進(jìn)入等待狀態(tài)。只有再次短按遙控器按鈕,電路才會(huì)重新動(dòng)作,重復(fù)遙控開(kāi)機(jī)的過(guò)程。
????????????????????????????????????????????????????????????????????????????廣東??黃鋒
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