一、led驅動電源種類有哪些
1、按驅動方式分為恒流式和恒壓式
(1)恒流(liu)式:恒流(liu)式電(dian)(dian)路(lu)(lu)特(te)點是(shi)輸出電(dian)(dian)流(liu)恒定,輸出電(dian)(dian)壓(ya)隨(sui)著負載電(dian)(dian)阻大小變(bian)(bian)化(hua)而變(bian)(bian)化(hua),恒流(liu)式電(dian)(dian)源驅動(dong)LED是(shi)較為理(li)想的方案并且不怕負載短路(lu)(lu),LED亮度一致性(xing)較好。缺點:成本昂貴、禁止負載完全開路(lu)(lu)、LED數量不宜過(guo)多(duo),因為電(dian)(dian)源都有(you)最大承受(shou)電(dian)(dian)流(liu)以及電(dian)(dian)壓(ya)。
(2)恒壓(ya)式:恒壓(ya)式驅(qu)動(dong)電(dian)路特點是輸出電(dian)壓(ya)恒定,輸出電(dian)流隨著(zhu)負載電(dian)阻大小變化而變化,電(dian)壓(ya)不會很高(gao)。缺點:禁止負載完(wan)全短(duan)路、電(dian)壓(ya)波動(dong)會影響(xiang)LED亮度(du)。
2、按電路結構分為電容降壓、變壓器降壓、電阻降壓、RCC降壓、PWM控制式
(1)電(dian)(dian)(dian)(dian)容(rong)(rong)降壓(ya):采用電(dian)(dian)(dian)(dian)容(rong)(rong)降壓(ya)方式的LED電(dian)(dian)(dian)(dian)源容(rong)(rong)易容(rong)(rong)易受電(dian)(dian)(dian)(dian)網電(dian)(dian)(dian)(dian)壓(ya)波(bo)動的影(ying)響,沖擊(ji)電(dian)(dian)(dian)(dian)流(liu)過大(da),電(dian)(dian)(dian)(dian)源效(xiao)率低,但(dan)是結構簡單。
(2)變壓器(qi)降(jiang)壓:這種方(fang)式轉換效率(lv)低下(xia),可靠性不高(gao),變壓器(qi)笨重(zhong)。
(3)電(dian)(dian)阻降(jiang)壓:這種方(fang)式與電(dian)(dian)容降(jiang)壓方(fang)式差不多,只不過(guo)電(dian)(dian)阻需要消耗更大(da)的(de)電(dian)(dian)能,因此(ci)電(dian)(dian)源(yuan)效(xiao)率也(ye)是比較低下(xia)。
(4)RCC降壓式:這種方式應用的(de)就(jiu)多一(yi)點,不僅因(yin)為它(ta)的(de)穩壓范圍(wei)寬,同時它(ta)的(de)電(dian)源利用效(xiao)率(lv)也能達到70%多,但是它(ta)的(de)負載電(dian)壓紋波較大(da)。
(5)PWM控(kong)制式(shi):采(cai)用PWM這種(zhong)方式(shi)就(jiu)不(bu)得(de)不(bu)提一下了(le),因為就(jiu)現在而言PWM控(kong)制方式(shi)設計的(de)LED電(dian)(dian)源(yuan)(yuan)(yuan)是比(bi)較(jiao)理想(xiang)的(de),這種(zhong)LED驅動電(dian)(dian)源(yuan)(yuan)(yuan)輸出電(dian)(dian)壓或(huo)電(dian)(dian)流都(dou)很穩定(ding),電(dian)(dian)源(yuan)(yuan)(yuan)轉(zhuan)換效(xiao)率也能達到80%,甚至90%以上,值得(de)注意的(de)是,這種(zhong)電(dian)(dian)源(yuan)(yuan)(yuan)還可以附加多重保護電(dian)(dian)路。
3、按輸入輸出是否隔離可分為隔離式和非隔離式
(1)隔(ge)(ge)離(li)式(shi)(shi)(shi)(shi)(shi):隔(ge)(ge)離(li)是為了安全起見,通過變壓器將(jiang)輸入輸出進行(xing)隔(ge)(ge)離(li)。常(chang)見拓(tuo)(tuo)撲(pu)類(lei)型有正(zheng)激(ji)式(shi)(shi)(shi)(shi)(shi)、反(fan)激(ji)式(shi)(shi)(shi)(shi)(shi)、半橋式(shi)(shi)(shi)(shi)(shi)、全橋式(shi)(shi)(shi)(shi)(shi)和推挽式(shi)(shi)(shi)(shi)(shi)等。正(zheng)激(ji)式(shi)(shi)(shi)(shi)(shi)和反(fan)激(ji)式(shi)(shi)(shi)(shi)(shi)拓(tuo)(tuo)撲(pu)多用于小功率(lv)場合,器件少而簡(jian)單易行(xing),其中反(fan)激(ji)式(shi)(shi)(shi)(shi)(shi)的(de)輸入電壓范圍寬,常(chang)與PFC結合在(zai)一起,其應用更加廣泛是反(fan)激(ji)式(shi)(shi)(shi)(shi)(shi)隔(ge)(ge)離(li)驅動。
(2)非隔(ge)離式:隔(ge)離型驅動器一般由(you)電池、蓄電池、穩壓電源供(gong)電,主要用于便攜式電子(zi)產品、礦燈、汽車等(deng)用電設備。
二、led驅動電源型號及參數
驅動器電源型號及參數:(多路輸出):lc14/12/24/30/60/100w;(單(dan)路輸入):lcd-14a/14b/16a/16b/20a(20b)/30a(30b)。
功(gong)率:150-240w。
輸入電壓(ya)范(fan)圍:12-30vdc。
輸出電壓范圍(wei):14-24vdc。
工(gong)作(zuo)頻率:50hz-60hz。
功率因數:0.99-0.995。
電流負載(zai)特性:正弦波(bo)、半橋(qiao)、全(quan)橋(qiao)。
恒(heng)(heng)流(liu)恒(heng)(heng)壓或恒(heng)(heng)壓浮(fu)充恒(heng)(heng)流(liu)模式:電(dian)流(liu)連(lian)續(xu)可(ke)調(diao);電(dian)壓連(lian)續(xu)可(ke)調(diao)。
過(guo)載保護功能(neng)過(guo)溫保護功能(neng)電(dian)源效率(lv):100%。
滿載(zai)效(xiao)率98%以上適用溫度:-5-55°C;尺寸(cun):420×350×150mm。
重量(liang):10kg。