恒流電源和穩流電(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)(de)(de)意(yi)思(si)都差不(bu)多，不(bu)需要細加的(de)(de)(de)(de)區別，我想大(da)家對于(yu)恒(heng)(heng)壓電(dian)(dian)(dian)源(yuan)(yuan)大(da)多都有所了解(jie)，因(yin)為我們(men)生(sheng)活中出現(xian)的(de)(de)(de)(de)大(da)部(bu)分(fen)電(dian)(dian)(dian)源(yuan)(yuan)都是(shi)屬于(yu)恒(heng)(heng)壓電(dian)(dian)(dian)源(yuan)(yuan)，比如一(yi)(yi)些日常(chang)(chang)生(sheng)活中常(chang)(chang)見的(de)(de)(de)(de)蓄電(dian)(dian)(dian)池、干電(dian)(dian)(dian)池等都屬于(yu)恒(heng)(heng)壓電(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)(de)(de)一(yi)(yi)種(zhong)，而與恒(heng)(heng)壓電(dian)(dian)(dian)源(yuan)(yuan)相比，恒(heng)(heng)流電(dian)(dian)(dian)源(yuan)(yuan)原(yuan)理(li)就(jiu)比較難懂(dong)一(yi)(yi)些了。那么接下(xia)來我們(men)就(jiu)簡單的(de)(de)(de)(de)介紹一(yi)(yi)下(xia)恒(heng)(heng)流電(dian)(dian)(dian)源(yuan)(yuan)原(yuan)理(li)究竟是(shi)什么。

　　為(wei)(wei)了(le)更好的(de)(de)理解恒(heng)(heng)流(liu)電(dian)(dian)(dian)源(yuan)原理，我(wo)們先(xian)來(lai)舉個(ge)(ge)例子。比如(ru)說將一(yi)個(ge)(ge)恒(heng)(heng)流(liu)電(dian)(dian)(dian)源(yuan)輸出(chu)(chu)(chu)(chu)的(de)(de)電(dian)(dian)(dian)流(liu)調(diao)節(jie)到1A，它的(de)(de)額定輸出(chu)(chu)(chu)(chu)最大電(dian)(dian)(dian)壓(ya)(ya)可以達(da)到100V，那(nei)么(me)你認(ren)為(wei)(wei)當你打開這(zhe)個(ge)(ge)恒(heng)(heng)流(liu)電(dian)(dian)(dian)源(yuan)的(de)(de)開關時，它的(de)(de)電(dian)(dian)(dian)流(liu)表和電(dian)(dian)(dian)壓(ya)(ya)表會顯(xian)示(shi)多少讀數呢?如(ru)果(guo)這(zhe)個(ge)(ge)恒(heng)(heng)流(liu)電(dian)(dian)(dian)源(yuan)還正常工作的(de)(de)話，其結果(guo)一(yi)定是(shi)(shi)輸出(chu)(chu)(chu)(chu)的(de)(de)電(dian)(dian)(dian)壓(ya)(ya)為(wei)(wei)100V，但是(shi)(shi)輸出(chu)(chu)(chu)(chu)的(de)(de)電(dian)(dian)(dian)流(liu)卻(que)是(shi)(shi)0A。講到這(zhe)里可能會有人(ren)提出(chu)(chu)(chu)(chu)疑問，不是(shi)(shi)剛(gang)才明明設定的(de)(de)輸出(chu)(chu)(chu)(chu)電(dian)(dian)(dian)流(liu)是(shi)(shi)1A嗎(ma)?為(wei)(wei)什么(me)結果(guo)卻(que)是(shi)(shi)顯(xian)示(shi)了(le)0A?當然這(zhe)里就(jiu)要牽扯(che)到物理中(zhong)有關歐姆定律的(de)(de)一(yi)些問題了(le)，根據歐姆定律中(zhong)的(de)(de)計算公(gong)式U=IR，其中(zhong)U就(jiu)是(shi)(shi)我(wo)們剛(gang)剛(gang)所說的(de)(de)輸出(chu)(chu)(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)，I即為(wei)(wei)輸出(chu)(chu)(chu)(chu)電(dian)(dian)(dian)流(liu)，R就(jiu)是(shi)(shi)電(dian)(dian)(dian)路中(zhong)德負載電(dian)(dian)(dian)阻。

　　但(dan)實際上(shang)(shang)以(yi)上(shang)(shang)只是說的(de)(de)(de)(de)理(li)論(lun)值(zhi)，但(dan)是實際上(shang)(shang)，當電(dian)(dian)(dian)(dian)(dian)路(lu)中(zhong)德負載電(dian)(dian)(dian)(dian)(dian)阻過大的(de)(de)(de)(de)時(shi)候(hou)，恒(heng)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)輸(shu)(shu)出(chu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)就(jiu)無法達到(dao)恒(heng)流(liu)(liu)(liu)值(zhi)了(le)，那么為了(le)保(bao)護電(dian)(dian)(dian)(dian)(dian)路(lu)，恒(heng)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)輸(shu)(shu)出(chu)電(dian)(dian)(dian)(dian)(dian)壓就(jiu)會(hui)自動的(de)(de)(de)(de)升到(dao)電(dian)(dian)(dian)(dian)(dian)路(lu)能夠承受的(de)(de)(de)(de)最(zui)大電(dian)(dian)(dian)(dian)(dian)壓值(zhi)。所以(yi)相(xiang)反，只有在電(dian)(dian)(dian)(dian)(dian)路(lu)中(zhong)德負載電(dian)(dian)(dian)(dian)(dian)阻值(zhi)小到(dao)一定(ding)程(cheng)度之后，才能夠使(shi)恒(heng)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)(shu)出(chu)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)為恒(heng)定(ding)值(zhi)，這(zhe)個時(shi)候(hou)恒(heng)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)才真正的(de)(de)(de)(de)處于恒(heng)流(liu)(liu)(liu)的(de)(de)(de)(de)工作(zuo)狀態。而(er)且即使(shi)電(dian)(dian)(dian)(dian)(dian)路(lu)中(zhong)的(de)(de)(de)(de)負載電(dian)(dian)(dian)(dian)(dian)阻的(de)(de)(de)(de)值(zhi)繼(ji)續減(jian)少，也只會(hui)引起輸(shu)(shu)出(chu)電(dian)(dian)(dian)(dian)(dian)壓的(de)(de)(de)(de)下降，并不會(hui)影響到(dao)輸(shu)(shu)出(chu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)(de)(de)大小。這(zhe)就(jiu)是恒(heng)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)原(yuan)理(li)。

　　實際(ji)上恒流(liu)電(dian)(dian)源原理和(he)恒壓(ya)電(dian)(dian)源原理相近，它們(men)在輸(shu)(shu)出(chu)電(dian)(dian)壓(ya)和(he)輸(shu)(shu)出(chu)電(dian)(dian)流(liu)這兩個輸(shu)(shu)出(chu)量中(zhong)都是其中(zhong)一(yi)個一(yi)直保持不(bu)(bu)變(bian)，要么(me)是輸(shu)(shu)出(chu)電(dian)(dian)壓(ya)不(bu)(bu)變(bian)，要么(me)是輸(shu)(shu)出(chu)電(dian)(dian)流(liu)不(bu)(bu)變(bian)，只不(bu)(bu)過是不(bu)(bu)變(bian)的量不(bu)(bu)一(yi)樣而已。

　　實(shi)際上無論是(shi)恒(heng)壓(ya)(ya)電(dian)源(yuan)(yuan)，還是(shi)恒(heng)流(liu)(liu)電(dian)源(yuan)(yuan)，它(ta)們本質上都(dou)是(shi)一(yi)(yi)致的(de)，它(ta)們的(de)輸出(chu)都(dou)是(shi)電(dian)壓(ya)(ya)和電(dian)流(liu)(liu)，兩(liang)個(ge)量中(zhong)，電(dian)源(yuan)(yuan)只能控制(zhi)其中(zhong)的(de)一(yi)(yi)個(ge)量，要么(me)穩(wen)住(zhu)電(dian)壓(ya)(ya)，要么(me)穩(wen)住(zhu)電(dian)流(liu)(liu)，另一(yi)(yi)個(ge)量是(shi)一(yi)(yi)定(ding)要由負(fu)載電(dian)阻來(lai)(lai)決(jue)定(ding)的(de)，而(er)負(fu)載電(dian)阻是(shi)由使用(yong)者(zhe)來(lai)(lai)決(jue)定(ding)的(de)，因而(er)電(dian)源(yuan)(yuan)的(de)兩(liang)個(ge)輸出(chu)量中(zhong)，必然有一(yi)(yi)個(ge)由使用(yong)者(zhe)來(lai)(lai)決(jue)定(ding)的(de)，這才能符(fu)合(he)邏輯，符(fu)合(he)歐(ou)姆定(ding)律，才能為使用(yong)者(zhe)所(suo)用(yong)，決(jue)無所(suo)謂既能給(gei)定(ding)輸出(chu)電(dian)壓(ya)(ya)，又(you)能同時給(gei)定(ding)輸出(chu)電(dian)流(liu)(liu)的(de)電(dian)源(yuan)(yuan)。