電源適配器雖然不大(da)(da)(da)，但它(ta)所包含的(de)(de)知(zhi)識(shi)實在是太多(duo)了，以往總是給(gei)大(da)(da)(da)家講解一些(xie)(xie)電(dian)源(yuan)(yuan)適配(pei)器的(de)(de)常識(shi)性知(zhi)識(shi)或者(zhe)問題，那(nei)些(xie)(xie)都是很常見(jian)的(de)(de)，今天我們就來(lai)給(gei)大(da)(da)(da)家聊(liao)一聊(liao)電(dian)源(yuan)(yuan)適配(pei)器一些(xie)(xie)冷門的(de)(de)知(zhi)識(shi)，借(jie)以加強大(da)(da)(da)家對電(dian)源(yuan)(yuan)適配(pei)器全方位的(de)(de)了解，那(nei)么我們一起來(lai)看(kan)看(kan)其都有哪些(xie)(xie)鮮為人(ren)知(zhi)的(de)(de)秘密：

　　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)源(yuan)(yuan)輸(shu)(shu)(shu)入(ru)(ru)隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)，這個(ge)(ge)名詞(ci)看(kan)上去似乎非(fei)常(chang)的(de)(de)(de)高(gao)大上，也常(chang)常(chang)讓一(yi)(yi)些剛(gang)開始(shi)接觸電(dian)(dian)子工程技術學習的(de)(de)(de)新人工程師(shi)們感(gan)到(dao)無從(cong)下手。實際上這個(ge)(ge)名詞(ci)背(bei)后的(de)(de)(de)含義，指的(de)(de)(de)是在(zai)電(dian)(dian)源(yuan)(yuan)的(de)(de)(de)輸(shu)(shu)(shu)出端接入(ru)(ru)一(yi)(yi)個(ge)(ge)隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)，歸(gui)根結底這一(yi)(yi)定義主(zhu)要還是對隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)的(de)(de)(de)拓(tuo)展理解。在(zai)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)(shu)入(ru)(ru)端接入(ru)(ru)一(yi)(yi)個(ge)(ge)隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)后，隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)初次(ci)級(ji)線圈隔(ge)(ge)(ge)(ge)離(li)(li)(li)，從(cong)而能(neng)(neng)夠(gou)保(bao)障(zhang)電(dian)(dian)源(yuan)(yuan)系統安全運(yun)行。這也是電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)(shu)入(ru)(ru)隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)的(de)(de)(de)主(zhu)要作用(yong)。通常(chang)來看(kan)，隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)大多適(shi)用(yong)于輸(shu)(shu)(shu)電(dian)(dian)范圍小，線路短的(de)(de)(de)供電(dian)(dian)范圍。而目前不少電(dian)(dian)器(qi)(qi)(qi)(qi)都是直接接入(ru)(ru)220V市電(dian)(dian)電(dian)(dian)網，用(yong)電(dian)(dian)器(qi)(qi)(qi)(qi)使用(yong)的(de)(de)(de)是低電(dian)(dian)壓(ya)(ya)(ya)，故需要通過電(dian)(dian)源(yuan)(yuan)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)進行降壓(ya)(ya)(ya)。如果不使用(yong)隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)可能(neng)(neng)就存在(zai)觸電(dian)(dian)的(de)(de)(de)危險，因此在(zai)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)(shu)入(ru)(ru)端接入(ru)(ru)一(yi)(yi)個(ge)(ge)隔(ge)(ge)(ge)(ge)離(li)(li)(li)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)(qi)，能(neng)(neng)夠(gou)有效保(bao)障(zhang)電(dian)(dian)器(qi)(qi)(qi)(qi)的(de)(de)(de)安全運(yun)行。

　　二、低頻變壓器與高頻變壓器的測試方式是不一樣的

　　在電(dian)(dian)(dian)源變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)的(de)應用過程(cheng)中，按(an)照不同的(de)工(gong)作頻(pin)(pin)率來對變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)產品(pin)進行劃分(fen)，通常可以(yi)分(fen)成低頻(pin)(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)和(he)高(gao)(gao)頻(pin)(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)兩種(zhong)。盡管二者的(de)工(gong)作原理是(shi)(shi)一(yi)樣(yang)(yang)的(de)，但是(shi)(shi)實際上低頻(pin)(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)和(he)高(gao)(gao)頻(pin)(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)的(de)測試(shi)原理不一(yi)樣(yang)(yang)的(de)。在進行測試(shi)的(de)過程(cheng)中，低頻(pin)(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)可以(yi)直接對交流電(dian)(dian)(dian)進行變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)，它(ta)測試(shi)的(de)項目主(zhu)要(yao)是(shi)(shi)輸出(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)以(yi)及相關的(de)參(can)數。包(bao)括空載(zai)(zai)(zai)輸入電(dian)(dian)(dian)流、空載(zai)(zai)(zai)輸出(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)、帶載(zai)(zai)(zai)輸入電(dian)(dian)(dian)流、帶載(zai)(zai)(zai)輸出(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)、效(xiao)率和(he)耐壓(ya)(ya)(ya)(ya)程(cheng)度(du)等。而高(gao)(gao)頻(pin)(pin)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)需要(yao)配合(he)電(dian)(dian)(dian)路才能工(gong)作，所(suo)以(yi)它(ta)的(de)測試(shi)項目主(zhu)要(yao)是(shi)(shi)與此相關的(de)性能測試(shi)，其測試(shi)的(de)主(zhu)要(yao)內(nei)容包(bao)括電(dian)(dian)(dian)感(gan)量(liang)、漏感(gan)、匝數比和(he)耐壓(ya)(ya)(ya)(ya)程(cheng)度(du)。

　　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

　　音響電源(yuan)(yuan)變(bian)(bian)壓器與普(pu)通的(de)電源(yuan)(yuan)變(bian)(bian)壓器可(ke)以(yi)(yi)互(hu)相替換使用嗎?答(da)案當然(ran)是(shi)：不能。目前(qian)市面(mian)上(shang)(shang)(shang)常(chang)見(jian)的(de)印(yin)象(xiang)電源(yuan)(yuan)變(bian)(bian)壓器，其實用的(de)大多(duo)都是(shi)環型變(bian)(bian)壓器。在實際應(ying)用中環形(xing)變(bian)(bian)壓器又常(chang)常(chang)被叫做(zuo)“環牛”，這種形(xing)式(shi)的(de)變(bian)(bian)壓器安裝(zhuang)方便，轉換效(xiao)率也很高，同時還具有(you)漏磁小的(de)特性(xing)。在重(zhong)量上(shang)(shang)(shang)環形(xing)變(bian)(bian)壓器比層疊(die)式(shi)變(bian)(bian)壓器重(zhong)量可(ke)以(yi)(yi)減輕一半(ban)，也比普(pu)通的(de)方型變(bian)(bian)壓器的(de)成本(ben)低，在制作工藝上(shang)(shang)(shang)其繞組均勻緊(jin)緊(jin)包住環形(xing)鐵心，有(you)效(xiao)地減小磁致(zhi)伸(shen)縮引起的(de)噪音，還有(you)利于散熱(re)。而之所(suo)以(yi)(yi)開關電源(yuan)(yuan)變(bian)(bian)壓器無(wu)法應(ying)用在音響電源(yuan)(yuan)上(shang)(shang)(shang)，是(shi)因(yin)為開關電源(yuan)(yuan)的(de)高頻干擾實在太嚴重(zhong)，會大大影響音響的(de)音質。