電源適配器雖然不大(da)，但它(ta)所包含的(de)(de)知識(shi)(shi)實(shi)在是(shi)太(tai)多了(le)，以往(wang)總是(shi)給大(da)家(jia)講(jiang)解一(yi)(yi)(yi)些(xie)電(dian)源適配(pei)器(qi)的(de)(de)常(chang)識(shi)(shi)性知識(shi)(shi)或者問題(ti)，那些(xie)都(dou)是(shi)很(hen)常(chang)見的(de)(de)，今天我(wo)們就(jiu)來給大(da)家(jia)聊(liao)一(yi)(yi)(yi)聊(liao)電(dian)源適配(pei)器(qi)一(yi)(yi)(yi)些(xie)冷門的(de)(de)知識(shi)(shi)，借(jie)以加(jia)強大(da)家(jia)對(dui)電(dian)源適配(pei)器(qi)全方位的(de)(de)了(le)解，那么我(wo)們一(yi)(yi)(yi)起來看(kan)看(kan)其(qi)都(dou)有(you)哪些(xie)鮮為人知的(de)(de)秘(mi)密：

　　一、“電源輸入隔離變壓器”其實就是電源輸入端接入了一個隔離變壓器

　　電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)，這(zhe)(zhe)(zhe)個名(ming)詞(ci)看(kan)上(shang)去似乎(hu)非常(chang)(chang)的(de)(de)(de)高大上(shang)，也常(chang)(chang)常(chang)(chang)讓一(yi)些剛(gang)開始接(jie)觸電(dian)(dian)(dian)(dian)子工(gong)程技術學習的(de)(de)(de)新人工(gong)程師(shi)們(men)感到無從下手。實(shi)際上(shang)這(zhe)(zhe)(zhe)個名(ming)詞(ci)背后(hou)的(de)(de)(de)含義，指的(de)(de)(de)是(shi)在(zai)(zai)電(dian)(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)(de)輸(shu)(shu)出端接(jie)入(ru)一(yi)個隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)，歸根結底這(zhe)(zhe)(zhe)一(yi)定義主要還(huan)是(shi)對隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)拓展理解。在(zai)(zai)電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)端接(jie)入(ru)一(yi)個隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)后(hou)，隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)初次級線(xian)圈隔(ge)離(li)(li)，從而(er)能夠保障電(dian)(dian)(dian)(dian)源(yuan)(yuan)系統安全運(yun)行(xing)(xing)。這(zhe)(zhe)(zhe)也是(shi)電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)主要作用。通常(chang)(chang)來(lai)看(kan)，隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)大多適用于(yu)輸(shu)(shu)電(dian)(dian)(dian)(dian)范圍小，線(xian)路短(duan)的(de)(de)(de)供電(dian)(dian)(dian)(dian)范圍。而(er)目前不少電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)都是(shi)直接(jie)接(jie)入(ru)220V市(shi)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)網，用電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)使(shi)用的(de)(de)(de)是(shi)低電(dian)(dian)(dian)(dian)壓(ya)(ya)，故需要通過電(dian)(dian)(dian)(dian)源(yuan)(yuan)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)進行(xing)(xing)降壓(ya)(ya)。如果不使(shi)用隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)可能就存在(zai)(zai)觸電(dian)(dian)(dian)(dian)的(de)(de)(de)危(wei)險，因(yin)此在(zai)(zai)電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)端接(jie)入(ru)一(yi)個隔(ge)離(li)(li)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)，能夠有效保障電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)安全運(yun)行(xing)(xing)。

　　二、低頻變壓器與高頻變壓器的測試方式是不一樣的

　　在(zai)電(dian)(dian)源變(bian)(bian)(bian)壓(ya)(ya)(ya)器的(de)(de)(de)(de)(de)應用過程(cheng)中，按(an)照不(bu)同(tong)的(de)(de)(de)(de)(de)工作(zuo)頻(pin)率來(lai)對變(bian)(bian)(bian)壓(ya)(ya)(ya)器產品進(jin)行(xing)劃分，通常(chang)可以(yi)(yi)分成低頻(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)器和高頻(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)器兩種。盡(jin)管二者(zhe)的(de)(de)(de)(de)(de)工作(zuo)原(yuan)理是一樣(yang)的(de)(de)(de)(de)(de)，但是實際上低頻(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)器和高頻(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)器的(de)(de)(de)(de)(de)測試(shi)(shi)原(yuan)理不(bu)一樣(yang)的(de)(de)(de)(de)(de)。在(zai)進(jin)行(xing)測試(shi)(shi)的(de)(de)(de)(de)(de)過程(cheng)中，低頻(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)器可以(yi)(yi)直接(jie)對交流電(dian)(dian)進(jin)行(xing)變(bian)(bian)(bian)壓(ya)(ya)(ya)，它(ta)測試(shi)(shi)的(de)(de)(de)(de)(de)項(xiang)(xiang)目主(zhu)要是輸(shu)出電(dian)(dian)壓(ya)(ya)(ya)以(yi)(yi)及相(xiang)關(guan)的(de)(de)(de)(de)(de)參數。包括空(kong)載輸(shu)入(ru)電(dian)(dian)流、空(kong)載輸(shu)出電(dian)(dian)壓(ya)(ya)(ya)、帶(dai)載輸(shu)入(ru)電(dian)(dian)流、帶(dai)載輸(shu)出電(dian)(dian)壓(ya)(ya)(ya)、效(xiao)率和耐壓(ya)(ya)(ya)程(cheng)度等。而高頻(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)器需(xu)要配合電(dian)(dian)路才(cai)能工作(zuo)，所以(yi)(yi)它(ta)的(de)(de)(de)(de)(de)測試(shi)(shi)項(xiang)(xiang)目主(zhu)要是與此相(xiang)關(guan)的(de)(de)(de)(de)(de)性(xing)能測試(shi)(shi)，其測試(shi)(shi)的(de)(de)(de)(de)(de)主(zhu)要內(nei)容(rong)包括電(dian)(dian)感量、漏感、匝數比和耐壓(ya)(ya)(ya)程(cheng)度。

　　三、目前市面上常見的音響電源變壓器基本上都是環形變壓器

　　音響(xiang)電源(yuan)(yuan)變(bian)(bian)壓器(qi)與普通的(de)(de)(de)電源(yuan)(yuan)變(bian)(bian)壓器(qi)可(ke)以互(hu)相替換使(shi)用嗎?答案當然是(shi)：不能。目前市(shi)面(mian)上(shang)常見的(de)(de)(de)印象(xiang)電源(yuan)(yuan)變(bian)(bian)壓器(qi)，其實(shi)用的(de)(de)(de)大(da)多都是(shi)環(huan)型變(bian)(bian)壓器(qi)。在實(shi)際應用中環(huan)形(xing)變(bian)(bian)壓器(qi)又常常被叫做“環(huan)牛”，這種形(xing)式的(de)(de)(de)變(bian)(bian)壓器(qi)安(an)裝方(fang)便，轉換效率(lv)也很(hen)高，同時(shi)還具有漏磁小(xiao)的(de)(de)(de)特(te)性。在重(zhong)量上(shang)環(huan)形(xing)變(bian)(bian)壓器(qi)比層疊式變(bian)(bian)壓器(qi)重(zhong)量可(ke)以減(jian)輕一(yi)半，也比普通的(de)(de)(de)方(fang)型變(bian)(bian)壓器(qi)的(de)(de)(de)成本低，在制作工藝上(shang)其繞組均勻緊緊包住(zhu)環(huan)形(xing)鐵心(xin)，有效地減(jian)小(xiao)磁致(zhi)伸縮引起的(de)(de)(de)噪音，還有利于(yu)散熱。而之所以開(kai)關電源(yuan)(yuan)變(bian)(bian)壓器(qi)無法應用在音響(xiang)電源(yuan)(yuan)上(shang)，是(shi)因(yin)為(wei)開(kai)關電源(yuan)(yuan)的(de)(de)(de)高頻干擾實(shi)在太嚴重(zhong)，會大(da)大(da)影響(xiang)音響(xiang)的(de)(de)(de)音質。