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茄子视频APP > 茄子视频APP > 線性電源適配器的結構與特點!

線性電源適配器的結構與特點!

  開關電源不同于線性電源適配器,前(qian)者(zhe)(zhe)調整管工作在(zai)通(tong)、斷(duan)狀態(tai),后者(zhe)(zhe)調整管工作在(zai)線性狀態(tai)。電(dian)源(yuan)適(shi)(shi)配(pei)(pei)器(qi)通(tong)過控制調整管的(de)通(tong)、斷(duan)時間實現穩(wen)壓。電(dian)源(yuan)適(shi)(shi)配(pei)(pei)器(qi)的(de)優點是體積(ji)小、重量輕、功耗小、穩(wen)壓范圍寬(kuan),效率(lv)可高達80%~90%。調整管功率(lv)損耗小,散熱器(qi)也隨(sui)之(zhi)減(jian)小。英(ying)規電(dian)源(yuan)適(shi)(shi)配(pei)(pei)器(qi)工作頻率(lv)在(zai)幾(ji)十千赫(he)茲(zi)甚至幾(ji)百千赫(he)茲(zi),濾波(bo)電(dian)感、電(dian)容元件可用較小的(de)容量,允許的(de)環境溫(wen)度也可以大(da)大(da)提高,廣泛應(ying)用在(zai)各種(zhong)電(dian)子設備中(zhong)。本(ben)章主要(yao)介紹電(dian)源(yuan)適(shi)(shi)配(pei)(pei)器(qi)的(de)基本(ben)構成、分類及工作原理,讓讀者(zhe)(zhe)對電(dian)源(yuan)適(shi)(shi)配(pei)(pei)器(qi)有一個初步(bu)的(de)認識。

線性電源適配器的結構與特點!

  穩壓電源適配器的比較

  電(dian)(dian)(dian)(dian)子(zi)設備(bei)(bei)離不開(kai)電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)。電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)供給電(dian)(dian)(dian)(dian)子(zi)設備(bei)(bei)所需要(yao)的能(neng)量。電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)的性(xing)能(neng)、質量直接影(ying)響著電(dian)(dian)(dian)(dian)子(zi)設備(bei)(bei)的安全可靠運行,故此對電(dian)(dian)(dian)(dian)子(zi)設備(bei)(bei)電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)性(xing)能(neng)、質量的要(yao)求也越來越高。現(xian)有的電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)主(zhu)要(yao)有兩大(da)類:串聯(lian)線性(xing)穩壓電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)(簡稱線性(xing)電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi))和開(kai)關穩壓電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)(簡稱電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi))。這兩類電(dian)(dian)(dian)(dian)源(yuan)適配(pei)(pei)(pei)(pei)器(qi)(qi)(qi)(qi)(qi)各具特(te)色而(er)被廣泛應用。

  線性電源適配器的結構與特點

  線性電(dian)(dian)源適配器通常都是由電(dian)(dian)網所(suo)提供的(de)交流(liu)電(dian)(dian),經過變壓、整流(liu)、濾(lv)波(bo)和穩壓環(huan)節(jie)而得(de)到。其各(ge)個部分電(dian)(dian)路的(de)作用如下:

  ①電(dian)(dian)源適配器(qi)變(bian)壓器(qi)——將220V電(dian)(dian)網電(dian)(dian)壓轉換為整流電(dian)(dian)路所需要的交流電(dian)(dian)壓值(zhi),而少部分電(dian)(dian)路采用(yong)電(dian)(dian)容(rong)降壓,如遙控(kong)電(dian)(dian)風扇(shan)電(dian)(dian)路。

  ②整(zheng)流電(dian)(dian)路——將交流電(dian)(dian)壓(ya)(ya)轉換為脈動直流電(dian)(dian)壓(ya)(ya)。常(chang)用的整(zheng)流電(dian)(dian)路有半(ban)波(bo)整(zheng)流電(dian)(dian)路、全波(bo)整(zheng)流電(dian)(dian)路和(he)橋(qiao)式整(zheng)流電(dian)(dian)路。

  ③濾波電(dian)路——將(jiang)脈動直(zhi)流電(dian)壓轉換成較為平滑的直(zhi)流電(dian)壓。線性電(dian)源(yuan)適配(pei)器(qi)中(zhong)常用的濾波電(dian)路有電(dian)感(gan)濾波、電(dian)容濾波和(he)阻容濾波,其中(zhong)最常用的是電(dian)容濾波。

  ④穩壓(ya)電(dian)路——將直流(liu)電(dian)源適配器(qi)的(de)(de)輸(shu)出電(dian)壓(ya)穩定(ding)(ding),基本不受(shou)電(dian)網電(dian)壓(ya)或負載的(de)(de)影響(xiang)。在線性電(dian)源適配器(qi)中(zhong)常用(yong)的(de)(de)穩壓(ya)電(dian)路有(you)二極管穩壓(ya)、串聯穩壓(ya)。其中(zhong),串聯穩壓(ya)有(you)現成(cheng)的(de)(de)集成(cheng)電(dian)路,如固定(ding)(ding)電(dian)壓(ya)輸(shu)出的(de)(de)集成(cheng)電(dian)路有(you)LM78××,LM79××等(deng),可調電(dian)壓(ya)輸(shu)出的(de)(de)集成(cheng)電(dian)路有(you)LM317和LM337等(deng)。

  4個功能模塊的線性穩壓電源適配器

  線性(xing)(xing)電(dian)源適(shi)配器(qi)的(de)優點是穩(wen)定性(xing)(xing)好、瞬態響應速度快、可靠性(xing)(xing)高、輸出(chu)電(dian)壓精度高和輸出(chu)紋波電(dian)壓小;缺點是工(gong)作頻率(lv)低(di)(di),所采用的(de)工(gong)頻變(bian)壓器(qi)、濾波器(qi)的(de)體積和重(zhong)量都較(jiao)大。調整管(guan)工(gong)作在線性(xing)(xing)狀態,功耗大、效率(lv)低(di)(di),需(xu)要加裝散熱器(qi)。

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