電源適配器雖然不大(da)，但(dan)它(ta)所包含的(de)知(zhi)(zhi)識(shi)實(shi)在是太多了，以(yi)往(wang)總是給大(da)家(jia)講解一(yi)些(xie)電源適(shi)配(pei)器(qi)的(de)常識(shi)性知(zhi)(zhi)識(shi)或者問題，那些(xie)都是很常見(jian)的(de)，今(jin)天我們就(jiu)來給大(da)家(jia)聊(liao)一(yi)聊(liao)電源適(shi)配(pei)器(qi)一(yi)些(xie)冷(leng)門的(de)知(zhi)(zhi)識(shi)，借以(yi)加強大(da)家(jia)對電源適(shi)配(pei)器(qi)全方位的(de)了解，那么我們一(yi)起來看看其都有哪(na)些(xie)鮮為人(ren)知(zhi)(zhi)的(de)秘密(mi)：

　　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)源(yuan)(yuan)(yuan)輸(shu)入隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)，這個(ge)(ge)名詞看上去似(si)乎(hu)非常(chang)的(de)(de)(de)高大上，也(ye)常(chang)常(chang)讓一(yi)些剛(gang)開始接(jie)觸(chu)(chu)電(dian)子(zi)工(gong)(gong)程技術學習的(de)(de)(de)新人工(gong)(gong)程師們感(gan)到(dao)無從(cong)下手。實際上這個(ge)(ge)名詞背后(hou)的(de)(de)(de)含義(yi)，指的(de)(de)(de)是(shi)在(zai)電(dian)源(yuan)(yuan)(yuan)的(de)(de)(de)輸(shu)出(chu)端接(jie)入一(yi)個(ge)(ge)隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)，歸(gui)根結底這一(yi)定(ding)義(yi)主(zhu)要(yao)還是(shi)對隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)拓展理(li)解。在(zai)電(dian)源(yuan)(yuan)(yuan)輸(shu)入端接(jie)入一(yi)個(ge)(ge)隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)后(hou)，隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)初次級(ji)線圈隔(ge)(ge)離(li)(li)，從(cong)而能夠保障(zhang)電(dian)源(yuan)(yuan)(yuan)系(xi)統(tong)安(an)全運行。這也(ye)是(shi)電(dian)源(yuan)(yuan)(yuan)輸(shu)入隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)主(zhu)要(yao)作用。通(tong)常(chang)來看，隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)大多適用于輸(shu)電(dian)范(fan)(fan)圍(wei)小，線路短的(de)(de)(de)供電(dian)范(fan)(fan)圍(wei)。而目前不少(shao)電(dian)器(qi)(qi)(qi)都是(shi)直接(jie)接(jie)入220V市電(dian)電(dian)網，用電(dian)器(qi)(qi)(qi)使(shi)用的(de)(de)(de)是(shi)低電(dian)壓(ya)(ya)(ya)(ya)(ya)，故需要(yao)通(tong)過電(dian)源(yuan)(yuan)(yuan)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)進(jin)行降壓(ya)(ya)(ya)(ya)(ya)。如果(guo)不使(shi)用隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)可能就存在(zai)觸(chu)(chu)電(dian)的(de)(de)(de)危險，因此在(zai)電(dian)源(yuan)(yuan)(yuan)輸(shu)入端接(jie)入一(yi)個(ge)(ge)隔(ge)(ge)離(li)(li)變(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)，能夠有效保障(zhang)電(dian)器(qi)(qi)(qi)的(de)(de)(de)安(an)全運行。

　　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(yuan)變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)的(de)應(ying)用過(guo)程中，按照不同的(de)工作頻率來對(dui)變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)產品進行(xing)劃分(fen)，通(tong)常可以分(fen)成低頻變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)和(he)高頻變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)兩(liang)種。盡管二者的(de)工作原理是(shi)一樣的(de)，但是(shi)實際上低頻變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)和(he)高頻變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)的(de)測試(shi)(shi)原理不一樣的(de)。在(zai)進行(xing)測試(shi)(shi)的(de)過(guo)程中，低頻變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)可以直接對(dui)交流(liu)電(dian)(dian)進行(xing)變(bian)(bian)(bian)壓(ya)(ya)(ya)，它(ta)測試(shi)(shi)的(de)項目主要(yao)是(shi)輸出(chu)電(dian)(dian)壓(ya)(ya)(ya)以及(ji)相關的(de)參數(shu)。包(bao)括空(kong)載(zai)(zai)輸入電(dian)(dian)流(liu)、空(kong)載(zai)(zai)輸出(chu)電(dian)(dian)壓(ya)(ya)(ya)、帶載(zai)(zai)輸入電(dian)(dian)流(liu)、帶載(zai)(zai)輸出(chu)電(dian)(dian)壓(ya)(ya)(ya)、效率和(he)耐(nai)壓(ya)(ya)(ya)程度等。而(er)高頻變(bian)(bian)(bian)壓(ya)(ya)(ya)器(qi)需要(yao)配合(he)電(dian)(dian)路才能(neng)工作，所以它(ta)的(de)測試(shi)(shi)項目主要(yao)是(shi)與(yu)此相關的(de)性能(neng)測試(shi)(shi)，其測試(shi)(shi)的(de)主要(yao)內容包(bao)括電(dian)(dian)感量、漏感、匝數(shu)比和(he)耐(nai)壓(ya)(ya)(ya)程度。

　　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(dian)源(yuan)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)與普(pu)通(tong)的電(dian)源(yuan)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)可以(yi)互相替換使(shi)用(yong)嗎(ma)?答案當然是(shi)：不能。目(mu)前(qian)市(shi)面上(shang)(shang)常見(jian)的印(yin)象電(dian)源(yuan)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)，其實(shi)用(yong)的大多都是(shi)環型(xing)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)。在(zai)(zai)(zai)實(shi)際應(ying)用(yong)中環形變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)又常常被(bei)叫做“環牛”，這種(zhong)形式的變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)安裝方便，轉換效率也很(hen)高，同時(shi)還(huan)(huan)具有漏磁小的特(te)性。在(zai)(zai)(zai)重量上(shang)(shang)環形變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)比(bi)層疊式變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)重量可以(yi)減輕一半，也比(bi)普(pu)通(tong)的方型(xing)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)的成本(ben)低，在(zai)(zai)(zai)制(zhi)作(zuo)工(gong)藝上(shang)(shang)其繞組均勻緊緊包住環形鐵(tie)心，有效地減小磁致(zhi)伸縮引起的噪音，還(huan)(huan)有利于(yu)散熱。而之所以(yi)開關(guan)(guan)電(dian)源(yuan)變(bian)壓(ya)(ya)器(qi)(qi)(qi)(qi)無法應(ying)用(yong)在(zai)(zai)(zai)音響(xiang)電(dian)源(yuan)上(shang)(shang)，是(shi)因為開關(guan)(guan)電(dian)源(yuan)的高頻(pin)干擾(rao)實(shi)在(zai)(zai)(zai)太嚴重，會大大影響(xiang)音響(xiang)的音質。