一、開關電源適配器是干什么用的
開(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)源適配器(qi)是(shi)(shi)電(dian)(dian)(dian)(dian)(dian)源適配器(qi)的(de)(de)一種,俗(su)稱電(dian)(dian)(dian)(dian)(dian)壓轉換器(qi),是(shi)(shi)一種使用現(xian)代的(de)(de)電(dian)(dian)(dian)(dian)(dian)子技術,及(ji)相應(ying)的(de)(de)控制開(kai)關(guan)管開(kai)通以及(ji)相應(ying)的(de)(de)關(guan)斷時間比率,將市(shi)電(dian)(dian)(dian)(dian)(dian)220V交流(liu)電(dian)(dian)(dian)(dian)(dian)轉換成電(dian)(dian)(dian)(dian)(dian)子設(she)備(bei)或電(dian)(dian)(dian)(dian)(dian)器(qi)用的(de)(de)十幾伏(fu)交流(liu)電(dian)(dian)(dian)(dian)(dian)的(de)(de)設(she)備(bei),通常由全波(bo)整流(liu)器(qi)、開(kai)關(guan)管、激勵信號(hao)、續(xu)流(liu)二極管、儲能電(dian)(dian)(dian)(dian)(dian)感、濾波(bo)電(dian)(dian)(dian)(dian)(dian)容等及(ji)部分構成。
開關電(dian)(dian)源適配(pei)器廣泛配(pei)套(tao)于電(dian)(dian)話子母機、游戲機、語言復讀機、隨身聽、筆(bi)記本計(ji)算(suan)機、蜂窩電(dian)(dian)話等(deng)設備中。
二、開關電源適配器好用嗎
開關電(dian)(dian)源(yuan)適配器作為一種(zhong)電(dian)(dian)源(yuan)供應(ying)器,主要用來(lai)給各種(zhong)電(dian)(dian)器設備提供恒壓直(zhi)流電(dian)(dian),它具有(you)一定的優缺點:
1、開關電源適配器的優點
(1)體積小、重量(liang)輕:開(kai)關電源適配器沒有采用笨重的工頻變(bian)壓器,并且(qie)由于(yu)開(kai)關MOS管(guan)上的耗散功率大幅(fu)度降(jiang)低(di),省去(qu)了較(jiao)大的散熱片(pian),因此一般比較(jiao)迷(mi)你。
(2)功(gong)耗小、效率高:開(kai)關(guan)電(dian)源適(shi)配(pei)器(qi)電(dian)路中,開(kai)關(guan)MOS管在激勵信號(hao)的(de)激勵下(xia),它交替地工作在導通(tong)--截(jie)止(zhi)和截(jie)止(zhi)--導通(tong)的(de)開(kai)關(guan)狀(zhuang)態,轉換速度很(hen)快(kuai),頻(pin)率一(yi)般為(wei)50kHz以上(shang);一(yi)些優(you)質開(kai)關(guan)電(dian)源適(shi)配(pei)器(qi)甚至可(ke)以做到幾百或者近兆Hz,這(zhe)使(shi)得開(kai)關(guan)MOS管的(de)功(gong)耗很(hen)小,電(dian)源的(de)效率可(ke)以大(da)幅度地提高,其(qi)效率可(ke)達(da)到90%。
2、開關電源適配器的缺點
開關電(dian)(dian)源適配器在使用(yong)過程(cheng)中(zhong)需要良好(hao)的(de)(de)屏蔽及接地(di),以免逆變(bian)電(dian)(dian)路產(chan)生(sheng)的(de)(de)高頻電(dian)(dian)壓對周圍(wei)設備造成干(gan)擾;尤其是(shi)功率調(diao)整開關晶體管在工作在開關狀態(tai)下(xia),它(ta)產(chan)生(sheng)的(de)(de)交(jiao)流(liu)電(dian)(dian)壓和(he)電(dian)(dian)流(liu)通(tong)過電(dian)(dian)路中(zhong)的(de)(de)其他元器件(jian)會產(chan)生(sheng)尖(jian)峰(feng)干(gan)擾和(he)諧(xie)振干(gan)擾,需要采取一定的(de)(de)措施進行抑制、消除(chu)和(he)屏蔽,以免影響整機的(de)(de)正常(chang)工作。
總的(de)來說,開關電(dian)(dian)(dian)源(yuan)適配器還(huan)是(shi)比較(jiao)好用的(de),它憑(ping)借小型(xing)、輕(qing)量(liang)和(he)高效率的(de)優點,廣泛應用于絕大部分電(dian)(dian)(dian)子設備,是(shi)電(dian)(dian)(dian)子信息(xi)產(chan)業飛速發展不可缺少的(de)一種電(dian)(dian)(dian)源(yuan)方式.