隨著電(dian)力電(dian)子(zi)技術的發展和創新(xin),使得(de)開關電(dian)源技術也(ye)在(zai)不斷地創新(xin)。目前,開關電(dian)源以小型、輕量和高功率的特色被廣泛應用簡直一切(qie)的電(dian)子(zi)設(she)備,是當今電(dian)子(zi)信息(xi)產業(ye)飛速發展不可(ke)短少的一種(zhong)電(dian)源方式。
現代開(kai)關電源(yuan)有(you)兩種:一種是直流開(kai)關電源(yuan);另一種是溝通開(kai)關電源(yuan)。
這兒(er)首要介紹(shao)的(de)僅(jin)僅(jin)直流(liu)開關電(dian)(dian)(dian)源(yuan),其功用是(shi)將電(dian)(dian)(dian)能質量(liang)較差的(de)原生(sheng)態電(dian)(dian)(dian)源(yuan)(粗電(dian)(dian)(dian)),如市(shi)電(dian)(dian)(dian)電(dian)(dian)(dian)源(yuan)或蓄(xu)電(dian)(dian)(dian)池電(dian)(dian)(dian)源(yuan),轉換(huan)成滿(man)足設(she)備要求的(de)質量(liang)較高的(de)直流(liu)電(dian)(dian)(dian)壓(ya)。直流(liu)開關電(dian)(dian)(dian)源(yuan)的(de)核心是(shi)DC/DC轉換(huan)器。
因(yin)而直流開(kai)關(guan)電(dian)(dian)源(yuan)(yuan)的(de)(de)分(fen)(fen)類是(shi)依靠DC/DC轉(zhuan)換器分(fen)(fen)類的(de)(de)。也便是(shi)說,直流開(kai)關(guan)電(dian)(dian)源(yuan)(yuan)的(de)(de)分(fen)(fen)類與DC/DC轉(zhuan)換器的(de)(de)分(fen)(fen)類是(shi)根本相同的(de)(de),DC/DC轉(zhuan)換器的(de)(de)分(fen)(fen)類根本上便是(shi)直 流開(kai)關(guan)電(dian)(dian)源(yuan)(yuan)的(de)(de)分(fen)(fen)類。
開關電(dian)(dian)源(yuan)大致由主電(dian)(dian)路、 操控電(dian)(dian)路、檢測電(dian)(dian)路、輔助電(dian)(dian)源(yuan)四大部份組(zu)成(cheng)。
1、主電路
沖(chong)擊電(dian)(dian)流(liu)限幅:限制接(jie)通(tong)電(dian)(dian)源(yuan)瞬間輸入側的沖(chong)擊電(dian)(dian)流(liu)。
輸入濾波(bo)器:其作用是過(guo)濾電(dian)網(wang)存在的雜波(bo)及阻(zu)止本機發生的雜波(bo)反應回電(dian)網(wang)。
整(zheng)(zheng)流與濾波:將(jiang)電(dian)(dian)(dian)網溝通電(dian)(dian)(dian)源直(zhi)接整(zheng)(zheng)流為較滑潤的(de)直(zhi)流電(dian)(dian)(dian)。
逆變(bian)(bian):將(jiang)整流后(hou)的直流電(dian)變(bian)(bian)為高頻溝通電(dian),這是高頻開(kai)關電(dian)源的核心(xin)部分。
輸出整(zheng)流與濾波(bo):依據負載需求,供(gong)給安穩牢靠(kao)的直流電源。
2、操控電路
一(yi)方(fang)面從(cong)輸(shu)出端取樣,與(yu)設(she)定值進行(xing)比(bi)較,然后(hou)去操控逆變器,改動其脈寬或脈頻,使輸(shu)出安(an)穩(wen),另一(yi)方(fang)面,依據測驗電(dian)(dian)路供(gong)給(gei)的數據,經維(wei)(wei)護(hu)電(dian)(dian)路鑒別,供(gong)給(gei)操控電(dian)(dian)路對電(dian)(dian)源進行(xing)各種維(wei)(wei)護(hu)措施。
3、檢測電路
供給維護(hu)電路(lu)中正在(zai)運轉中各種參數(shu)和各種儀(yi)表(biao)數(shu)據。
4、輔助電源
完成電源的軟(ruan)件(長途(tu))發動,為維護(hu)電路和操控電路(PWM等芯片)作業供(gong)電。
下(xia)面介紹一(yi)些關于開(kai)關電源一(yi)些規范的回答。
1、開關電(dian)源變壓器假如用(yong)銅帶(dai)替代漆包線,其(qi)答(da)應(ying)經(jing)過(guo)的(de)電(dian)流(liu)(liu)怎樣(yang)算?比如說(shuo)厚度為(wei)0.1mm的(de)銅帶(dai),答(da)應(ying)經(jing)過(guo)的(de)電(dian)流(liu)(liu)怎樣(yang)算?
回答(da):假如開關電(dian)(dian)(dian)源變壓器用銅帶(dai)(dai)替代漆包(bao)線,銅帶(dai)(dai)(漆包(bao)線)的渦流(liu)損(sun)耗(hao)能(neng)(neng)夠大大將小,作業(ye)頻(pin)率能(neng)(neng)夠相應(ying)進步,但(dan)直(zhi)流(liu)損(sun)耗(hao)簡直(zhi)不變,銅帶(dai)(dai)答(da)應(ying)經過的電(dian)(dian)(dian)流(liu)密度(du)一般(ban)仍(reng)是不要超過4.5A/平方(fang)毫米。電(dian)(dian)(dian)流(liu)密度(du)等(deng)(deng)于電(dian)(dian)(dian)流(liu)除與以導體的截(jie)面(mian)積,導體的截(jie)面(mian)積等(deng)(deng)于厚(hou)(0.1mm)乘(cheng)以寬(銅帶(dai)(dai)的寬度(du))。
2、電(dian)源開關溝(gou)通回路(lu)和(he)整(zheng)流器的(de)溝(gou)通回路(lu)是(shi)最容易發生(sheng)電(dian)磁攪(jiao)擾的(de)嗎?
回答:開(kai)關(guan)電(dian)源發(fa)生電(dian)磁攪擾(rao)最嚴(yan)峻的(de)(de)地方是(shi)開(kai)關(guan)變壓器(qi)的(de)(de)初(chu)、次級線圈組成的(de)(de)電(dian)路,但它(ta)的(de)(de)攪擾(rao)會經(jing)過感應對其它(ta)電(dian)路發(fa)生輻(fu)(fu)(fu)射(she)和傳導攪擾(rao),傳導攪擾(rao)和輻(fu)(fu)(fu)射(she)攪擾(rao)最嚴(yan)峻的(de)(de)地方是(shi)電(dian)源線,由于電(dian)源線很容(rong)易成為輻(fu)(fu)(fu)射(she)源的(de)(de)半波振子天(tian)線,別的(de)(de)它(ta)又與(yu)外線路進行銜接,很容(rong)易把(ba)攪擾(rao)信號(hao)傳輸給(gei)其它(ta)設備。所以在開(kai)關(guan)電(dian)源的(de)(de)輸入(ru)端(duan)必定要對電(dian)源線進行有用隔離(li)。
3、下降(jiang)變(bian)壓(ya)器的溫升有什(shen)么具體(ti)方法?
回答:下(xia)(xia)降(jiang)(jiang)變(bian)(bian)(bian)壓溫升的(de)(de)(de)(de)方(fang)(fang)法一(yi)個(ge)是下(xia)(xia)降(jiang)(jiang)變(bian)(bian)(bian)壓器(qi)磁(ci)芯(xin)(xin)的(de)(de)(de)(de)**磁(ci)通(tong)增量(Bm)的(de)(de)(de)(de)取值,由于變(bian)(bian)(bian)壓器(qi)磁(ci)芯(xin)(xin)的(de)(de)(de)(de)損(sun)(sun)耗(hao)(hao)(磁(ci)滯損(sun)(sun)耗(hao)(hao)和渦(wo)流損(sun)(sun)耗(hao)(hao))與磁(ci)通(tong)密(mi)度(du)(du)的(de)(de)(de)(de)平方(fang)(fang)成正比;另一(yi)個(ge)是下(xia)(xia)降(jiang)(jiang)開關電(dian)源的(de)(de)(de)(de)作業(ye)頻(pin)率,由于變(bian)(bian)(bian)壓器(qi)磁(ci)芯(xin)(xin)的(de)(de)(de)(de)損(sun)(sun)耗(hao)(hao)(磁(ci)滯損(sun)(sun)耗(hao)(hao)和渦(wo)流損(sun)(sun)耗(hao)(hao))與作業(ye)頻(pin)率成正比;再一(yi)個(ge)是下(xia)(xia)降(jiang)(jiang)線圈(quan)的(de)(de)(de)(de)損(sun)(sun)耗(hao)(hao),線圈(quan)的(de)(de)(de)(de)損(sun)(sun)耗(hao)(hao)(首(shou)要是渦(wo)流損(sun)(sun)耗(hao)(hao)),線圈(quan)的(de)(de)(de)(de)渦(wo)流損(sun)(sun)耗(hao)(hao)與集膚(fu)效(xiao)應損(sun)(sun)耗(hao)(hao)也與作業(ye)頻(pin)率成正比,下(xia)(xia)降(jiang)(jiang)線圈(quan)的(de)(de)(de)(de)直流損(sun)(sun)耗(hao)(hao)必須下(xia)(xia)降(jiang)(jiang)導線的(de)(de)(de)(de)電(dian)流密(mi)度(du)(du),一(yi)般漆包(bao)線的(de)(de)(de)(de)電(dian)流密(mi)度(du)(du)不能超過4.5A/平方(fang)(fang)毫米(mi)。
4、反激式開關電源的(de)占(zhan)空比是怎樣改變的(de)?
回答:反激式開關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)的占(zhan)(zhan)空(kong)比(bi)首要由(you)輸入電(dian)(dian)(dian)(dian)(dian)壓和開關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)管(guan)的耐壓來(lai)決(jue)議,當輸入電(dian)(dian)(dian)(dian)(dian)壓改變時(shi)占(zhan)(zhan)空(kong)比(bi)也要跟著改變。例如當輸入電(dian)(dian)(dian)(dian)(dian)壓為AC260V時(shi),假如電(dian)(dian)(dian)(dian)(dian)源(yuan)開關(guan)管(guan)的耐壓為650V,則占(zhan)(zhan)空(kong)比(bi)大為0.306;當輸入電(dian)(dian)(dian)(dian)(dian)壓為AC170V時(shi),占(zhan)(zhan)空(kong)比(bi)大約(yue)為0.5;當輸入電(dian)(dian)(dian)(dian)(dian)壓低(di)于AC170V時(shi),占(zhan)(zhan)空(kong)比(bi)大于0.5。但不管(guan)輸入電(dian)(dian)(dian)(dian)(dian)壓這(zhe)樣改變,開關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)都會(hui)經過改動占(zhan)(zhan)空(kong)比(bi)來(lai)大到安穩(或改動)輸出(chu)電(dian)(dian)(dian)(dian)(dian)壓的數(shu)值。
5、正激和反激的區別首(shou)要在哪?
回答:正激式開(kai)關(guan)電(dian)(dian)源(yuan)(yuan)是電(dian)(dian)源(yuan)(yuan)開(kai)關(guan)管導通的時分,電(dian)(dian)源(yuan)(yuan)向擔(dan)任(ren)供(gong)(gong)給(gei)功率輸(shu)(shu)出(chu)(chu),而關(guan)斷的時分沒有(you)功率輸(shu)(shu)出(chu)(chu)。反(fan)激式開(kai)關(guan)電(dian)(dian)源(yuan)(yuan)正好相反(fan),電(dian)(dian)源(yuan)(yuan)開(kai)關(guan)管導通時只(zhi)向變壓(ya)器存儲能量(liang),沒有(you)給(gei)負(fu)(fu)載供(gong)(gong)給(gei)功率輸(shu)(shu)出(chu)(chu),僅在電(dian)(dian)源(yuan)(yuan)開(kai)關(guan)管關(guan)斷時才向負(fu)(fu)載供(gong)(gong)給(gei)輸(shu)(shu)出(chu)(chu)。正激式開(kai)關(guan)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)出(chu)(chu)電(dian)(dian)壓(ya)是取(qu)(qu)整流(liu)(liu)輸(shu)(shu)出(chu)(chu)電(dian)(dian)壓(ya)的平(ping)均(jun)值(zhi)(zhi),反(fan)激式開(kai)關(guan)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)出(chu)(chu)電(dian)(dian)壓(ya)是取(qu)(qu)整流(liu)(liu)輸(shu)(shu)出(chu)(chu)電(dian)(dian)壓(ya)的半(ban)波(bo)平(ping)均(jun)值(zhi)(zhi),兩種電(dian)(dian)壓(ya)輸(shu)(shu)出(chu)(chu)的相位正好相反(fan)。
6、具體講(jiang)講(jiang)環路的設計(ji)
回(hui)答:反(fan)應環(huan)路(lu)(lu)(lu)的(de)增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi),既不(bu)(bu)是(shi)越(yue)大越(yue)好,也不(bu)(bu)是(shi)越(yue)小(xiao)越(yue)好。當反(fan)應環(huan)路(lu)(lu)(lu)的(de)增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)過高(gao)時(shi),輸(shu)(shu)(shu)出(chu)(chu)電(dian)壓(ya)(ya)(ya)會圍繞著平均值(zhi)來回(hui)盯梢,輸(shu)(shu)(shu)出(chu)(chu)電(dian)壓(ya)(ya)(ya)上下動(dong)搖很(hen)厲(li)害,增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)越(yue)高(gao),動(dong)搖的(de)起伏就越(yue)大,嚴峻時(shi)會呈現(xian)(xian)振動(dong);當反(fan)應環(huan)路(lu)(lu)(lu)的(de)增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)過低時(shi),輸(shu)(shu)(shu)出(chu)(chu)電(dian)壓(ya)(ya)(ya)又會不(bu)(bu)安穩(wen),由(you)于電(dian)壓(ya)(ya)(ya)盯梢不(bu)(bu)到位,會存在一個(ge)滯后差(cha)錯(cuo)。為了使(shi)輸(shu)(shu)(shu)出(chu)(chu)電(dian)壓(ya)(ya)(ya)安穩(wen),但又不(bu)(bu)發生振動(dong),一般都把反(fan)應環(huan)路(lu)(lu)(lu)分紅三(san)個(ge)回(hui)路(lu)(lu)(lu)來組成,一個(ge)回(hui)路(lu)(lu)(lu)用(yong)來決議(yi)微分增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)的(de)巨細(xi),另一個(ge)回(hui)路(lu)(lu)(lu)用(yong)來決議(yi)積(ji)分增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)的(de)巨細(xi),還有一個(ge)是(shi)決議(yi)直流增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)的(de)巨細(xi)。這樣(yang)做(zuo)的(de)目的(de)是(shi),在差(cha)錯(cuo)信號(hao)很(hen)小(xiao)的(de)時(shi)分,環(huan)路(lu)(lu)(lu)增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)很(hen)大,而在差(cha)錯(cuo)小(xiao)號(hao)很(hen)大的(de)時(shi)分環(huan)路(lu)(lu)(lu)增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)又會變小(xiao),即差(cha)錯(cuo)放(fang)大器(qi)的(de)增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi)是(shi)動(dong)態的(de)。細(xi)心調(diao)節(jie)這三(san)個(ge)反(fan)應環(huan)路(lu)(lu)(lu)的(de)增(zeng)(zeng)(zeng)(zeng)益(yi)(yi)(yi),就能夠完成開關電(dian)源既安穩(wen),又不(bu)(bu)呈現(xian)(xian)振動(dong)。
7、反激電源開關MOS怎(zen)樣降到**?特別(bie)是(shi)在硬(ying)開關條件下。
回答(da):下(xia)降占(zhan)空比,但占(zhan)空比太低,電源的(de)作業功率大大下(xia)降,電壓(ya)調整規模也會減小。
8、銅(tong)箔損耗占電源損耗比例約(yue)為多(duo)少?
回(hui)答(da):十(shi)分小,假(jia)如銅(tong)箔損耗大(da),銅(tong)箔的溫(wen)升會很高,假(jia)如超(chao)過80度,銅(tong)箔的油漆(qi)會發黃。但也只相當于一個1~3瓦左右的金屬膜電阻在(zai)相同溫(wen)升時的損耗。
9、驅(qu)動(dong)波(bo)形巨(ju)細波(bo)問題是什(shen)么原(yuan)因(yin)引起的(de)(de)??電(dian)源在低(di)壓(ya)AC85-120V的(de)(de)時分輸出驅(qu)動(dong)都很正常(chang),,當電(dian)壓(ya)變為(wei)120-150V的(de)(de)時分,驅(qu)動(dong)呈(cheng)現巨(ju)細波(bo),輸出電(dian)流明顯(xian)下降。當電(dian)壓(ya)再次提(ti)升到150V-265V的(de)(de)時分,驅(qu)動(dong)波(bo)形的(de)(de)頻率徹底不(bu)對頭了,輸出也不(bu)對了。
回答(da):假(jia)如(ru)驅動(dong)電(dian)路采用電(dian)容或變(bian)(bian)壓器輸出,會(hui)呈現這種情(qing)況(kuang),由于電(dian)容或變(bian)(bian)壓器傳輸波(bo)形(信號時),信號中不能含有直流重(zhong)(zhong)量,假(jia)如(ru)含有直流重(zhong)(zhong)量,輸出波(bo)形將呈現嚴峻失(shi)真,只要驅動(dong)電(dian)路的輸出波(bo)形,其占空比為(wei)0.5時,輸出波(bo)形才不會(hui)發生失(shi)真,而(er)占空比過大或過小,都會(hui)呈現失(shi)真。
10、關于整流(liu)(liu)橋的(de)(de)挑選,不同(tong)的(de)(de)功率選怎樣樣的(de)(de)整流(liu)(liu)橋?一(yi)款30W的(de)(de)電源,用了3A700V的(de)(de)整流(liu)(liu)橋,發現(xian)整流(liu)(liu)橋很燙,沒幾分鐘溫度就大(da)約有60多度了。這(zhe)個引起整流(liu)(liu)橋發燙的(de)(de)原因有哪些(xie)?
回(hui)答:整(zheng)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)二極(ji)管的(de)(de)(de)挑(tiao)選(xuan)首(shou)要(yao)是依據流(liu)(liu)(liu)(liu)(liu)(liu)(liu)過整(zheng)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)二極(ji)管的(de)(de)(de)電(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)巨細和耐壓還(huan)有作業頻率這(zhe)三個參數來(lai)決議,進行(xing)電(dian)路(lu)參數設(she)計(ji)時,流(liu)(liu)(liu)(liu)(liu)(liu)(liu)過整(zheng)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)二極(ji)管的(de)(de)(de)電(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)一(yi)般只能取標稱值(25℃時)的(de)(de)(de)三分之(zhi)一(yi),由于流(liu)(liu)(liu)(liu)(liu)(liu)(liu)過整(zheng)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)二極(ji)管的(de)(de)(de)作業溫度(du)或(huo)許會(hui)上升到80℃以(yi)上。假如整(zheng)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)二極(ji)管的(de)(de)(de)導(dao)通(tong)和關斷速度(du)很低,它在電(dian)壓反向的(de)(de)(de)情(qing)(qing)況下(xia)還(huan)會(hui)導(dao)通(tong)一(yi)段時刻,即反向電(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)十分大,這(zhe)樣整(zheng)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)二極(ji)管也會(hui)發熱。整(zheng)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)橋發熱或(huo)許屬于后一(yi)種情(qing)(qing)況。
11、反應(ying)環路(lu)設計以及(ji)補償怎樣入(ru)手?
回答:反(fan)應環路(lu)(lu)(lu)的(de)增(zeng)(zeng)益(yi)(yi)(yi),既不是(shi)越大越好(hao),也不是(shi)越小越好(hao)。當反(fan)應環路(lu)(lu)(lu)的(de)增(zeng)(zeng)益(yi)(yi)(yi)過(guo)(guo)高時(shi),輸出(chu)電(dian)壓(ya)會(hui)(hui)圍繞著平均值上下動搖,增(zeng)(zeng)益(yi)(yi)(yi)越高,動搖的(de)起伏就(jiu)越大,嚴峻時(shi)會(hui)(hui)呈(cheng)現(xian)振動;當反(fan)應環路(lu)(lu)(lu)的(de)增(zeng)(zeng)益(yi)(yi)(yi)過(guo)(guo)低時(shi),輸出(chu)電(dian)壓(ya)又會(hui)(hui)不安穩(wen)。為了使輸出(chu)電(dian)壓(ya)安穩(wen),但又不發生振動,一(yi)般都(dou)把(ba)反(fan)應環路(lu)(lu)(lu)分紅三個(ge)回路(lu)(lu)(lu)來(lai)(lai)組成,一(yi)個(ge)回路(lu)(lu)(lu)用來(lai)(lai)決議(yi)微分增(zeng)(zeng)益(yi)(yi)(yi)的(de)巨細(xi),另一(yi)個(ge)回路(lu)(lu)(lu)用來(lai)(lai)決議(yi)積分增(zeng)(zeng)益(yi)(yi)(yi)的(de)巨細(xi),還有一(yi)個(ge)是(shi)決議(yi)直流增(zeng)(zeng)益(yi)(yi)(yi)的(de)巨細(xi)。細(xi)心調節這(zhe)三個(ge)反(fan)應環路(lu)(lu)(lu)的(de)增(zeng)(zeng)益(yi)(yi)(yi),就(jiu)能夠(gou)完成開關電(dian)源既安穩(wen),又不呈(cheng)現(xian)振動。
12、DC TO DC功率(lv)有(you)點低,怎(zen)樣(yang)處理呢?
回(hui)答:把(ba)(ba)作業頻率下降(jiang),或把(ba)(ba)電(dian)源開關(guan)(guan)管換成一個高速開關(guan)(guan)管,別的還(huan)能夠(gou)把(ba)(ba)變(bian)壓器(qi)的體積加(jia)大,把(ba)(ba)**磁通(tong)密(mi)度(Bm)的取值下降(jiang),即(ji)把(ba)(ba)開關(guan)(guan)變(bian)壓器(qi)初級(ji)線圈的匝數添(tian)加(jia),由于開關(guan)(guan)變(bian)壓器(qi)的磁滯(zhi)損耗(hao)和(he)渦流損耗(hao)與(yu)(yu)作業頻率成正比(bi),與(yu)(yu)**磁通(tong)密(mi)度增量的平(ping)方成正比(bi)。
13、怎樣核算最小直(zhi)流電壓的?
回答:看“最(zui)小(xiao)(xiao)直流(liu)電(dian)(dian)(dian)(dian)壓(ya)(ya)”是(shi)指哪方(fang)面(mian)。假如(ru)(ru)是(shi)開關(guan)(guan)電(dian)(dian)(dian)(dian)源的(de)(de)(de)(de)最(zui)小(xiao)(xiao)輸入(ru)直流(liu)電(dian)(dian)(dian)(dian)壓(ya)(ya),一般可依據**輸入(ru)溝通(tong)電(dian)(dian)(dian)(dian)壓(ya)(ya)換算得(de)來,比如(ru)(ru),**輸入(ru)溝通(tong)電(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)AC100V(有用(yong)值(zhi)),則(ze)換算為(wei)**直流(liu)輸入(ru)電(dian)(dian)(dian)(dian)壓(ya)(ya)大約為(wei)120V(取(qu)平均(jun)值(zhi)),由于整流(liu)濾(lv)波后**值(zhi)為(wei)140V,**值(zhi)為(wei)100V,取(qu)平均(jun)值(zhi)便是(shi)120V。假如(ru)(ru)最(zui)小(xiao)(xiao)直流(liu)電(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)晶體管自激式開關(guan)(guan)電(dian)(dian)(dian)(dian)源的(de)(de)(de)(de)正反應(ying)電(dian)(dian)(dian)(dian)壓(ya)(ya),則(ze)此電(dian)(dian)(dian)(dian)壓(ya)(ya)**選為(wei)晶管導通(tong)時(shi)作(zuo)業(ye)(ye)電(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)(de)(de)2倍(bei)(bei),而留(liu)1倍(bei)(bei)作(zuo)為(wei)可調整的(de)(de)(de)(de)余量(liang)用(yong)。假如(ru)(ru)最(zui)小(xiao)(xiao)直流(liu)電(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)場效應(ying)管驅(qu)動電(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)最(zui)小(xiao)(xiao)作(zuo)業(ye)(ye)電(dian)(dian)(dian)(dian)壓(ya)(ya),則(ze)此作(zuo)業(ye)(ye)電(dian)(dian)(dian)(dian)壓(ya)(ya)**不能小(xiao)(xiao)于16V,由于,大功率場效應(ying)管深度(du)飽滿需(xu)求的(de)(de)(de)(de)驅(qu)動電(dian)(dian)(dian)(dian)壓(ya)(ya)都在(zai)12V以上(shang)(**為(wei)20V)。
14、反激式變(bian)壓器電源輸(shu)出側(ce)有毛刺(ci),且毛刺(ci)的頻(pin)率和原邊開(kai)關頻(pin)率相同,怎樣消除毛刺(ci)呢(ni)?
回(hui)答:在次級整(zheng)流(liu)與濾(lv)波電容之間串了一個(ge)小電感(gan),但(dan)電感(gan)流(liu)過直流(liu)時不能飽滿,這種(zhong)電感(gan)的磁回(hui)路不能用封(feng)閉(bi)式的,必需要留有很大的氣隙。
15、反激式電源開關頻(pin)率怎樣優化(hua)挑選?VOR反激電壓怎樣優化(hua)設置,在(zai)什么情況(kuang)下最合適?匝比怎樣**化(hua)核算?。
回答:反激(ji)式(shi)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)作(zuo)業(ye)(ye)頻(pin)(pin)率(lv)的(de)(de)(de)(de)挑選(xuan)首要與(yu)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)作(zuo)業(ye)(ye)功(gong)(gong)率(lv)和(he)(he)體積巨細有(you)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan),而開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)作(zuo)業(ye)(ye)功(gong)(gong)率(lv)又首要與(yu)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)管(guan)(guan)(guan)(guan)、開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)變(bian)壓器(qi)的(de)(de)(de)(de)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)(磁滯損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)和(he)(he)渦(wo)流(liu)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao))有(you)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan),這(zhe)兩者(zhe)的(de)(de)(de)(de)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)均與(yu)頻(pin)(pin)率(lv)成(cheng)(cheng)正比。開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)首要由開(kai)(kai)(kai)(kai)通(tong)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)(導(dao)通(tong)時(shi)(shi)(shi)刻損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao))和(he)(he)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)(關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)時(shi)(shi)(shi)刻損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao))組成(cheng)(cheng),開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)導(dao)通(tong)時(shi)(shi)(shi)刻和(he)(he)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)時(shi)(shi)(shi)刻越(yue)長,這(zhe)兩個損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)就越(yue)大(da)。一般大(da)功(gong)(gong)率(lv)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)導(dao)通(tong)時(shi)(shi)(shi)刻和(he)(he)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)時(shi)(shi)(shi)刻都(dou)比小功(gong)(gong)率(lv)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)導(dao)通(tong)時(shi)(shi)(shi)刻和(he)(he)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)時(shi)(shi)(shi)刻長許多(duo),所以大(da)功(gong)(gong)率(lv)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)作(zuo)業(ye)(ye)頻(pin)(pin)率(lv)一般都(dou)獲得比較低。在考慮開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)作(zuo)業(ye)(ye)功(gong)(gong)率(lv)時(shi)(shi)(shi),假(jia)如從(cong)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)體積和(he)(he)本錢等(deng)方面考慮,**選(xuan)作(zuo)業(ye)(ye)功(gong)(gong)率(lv)為80%左右較為合適(shi),此刻,開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)大(da)約占(zhan)總(zong)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)的(de)(de)(de)(de)50%,開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)變(bian)壓器(qi)的(de)(de)(de)(de)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)大(da)約占(zhan)總(zong)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)的(de)(de)(de)(de)30%,其(qi)他電(dian)(dian)(dian)路的(de)(de)(de)(de)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)大(da)約占(zhan)總(zong)損(sun)(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)的(de)(de)(de)(de)20%。開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)變(bian)壓器(qi)的(de)(de)(de)(de)匝數比與(yu)輸入輸出電(dian)(dian)(dian)壓的(de)(de)(de)(de)比值有(you)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan),與(yu)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)占(zhan)空比有(you)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。
16、初(chu)期峰值電流IP 和反激(ji)電壓VOR 以及**化的反激(ji)電源占空比(bi)怎樣設定(ding)。
回答:反激(ji)式開(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)初(chu)、次(ci)級線圈發生(sheng)的(de)(de)反激(ji)電(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)巨細(xi)均與開(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)占(zhan)空(kong)比有(you)關(guan)(guan)(guan),以及與輸入電(dian)(dian)(dian)(dian)(dian)壓(ya)有(you)關(guan)(guan)(guan),在挑(tiao)選開(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)占(zhan)空(kong)比時(shi),必須考慮,初(chu)、級線圈發生(sheng)的(de)(de)反激(ji)電(dian)(dian)(dian)(dian)(dian)壓(ya)峰值與作業電(dian)(dian)(dian)(dian)(dian)壓(ya)(輸入電(dian)(dian)(dian)(dian)(dian)壓(ya))之(zhi)和不能(neng)超(chao)過電(dian)(dian)(dian)(dian)(dian)源(yuan)開(kai)關(guan)(guan)(guan)管耐壓(ya)Bvmax的(de)(de)0.7倍,依據此(ci)條件(Bvmax)就能(neng)夠核算反激(ji)式開(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)在**輸入電(dian)(dian)(dian)(dian)(dian)壓(ya)時(shi)的(de)(de)**占(zhan)空(kong)比Dmax。例如(ru),Bvmax為(wei)650V的(de)(de)電(dian)(dian)(dian)(dian)(dian)源(yuan)開(kai)關(guan)(guan)(guan)管,在輸入電(dian)(dian)(dian)(dian)(dian)壓(ya)為(wei)AC260V時(shi),其占(zhan)空(kong)比只(zhi)能(neng)選為(wei)0.306左右(you)。
17、反激(ji)式電(dian)源開(kai)關頻率(lv)怎樣優(you)化挑選?VOR反激(ji)電(dian)壓怎樣優(you)化設置(zhi),在什么情況下最合適?匝(za)比怎樣**化核算?
回答:反激式開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)作(zuo)業(ye)(ye)(ye)(ye)頻(pin)(pin)率(lv)(lv)的(de)(de)挑選首要(yao)與(yu)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)的(de)(de)作(zuo)業(ye)(ye)(ye)(ye)功(gong)率(lv)(lv)有關(guan)(guan)(guan),而開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)的(de)(de)作(zuo)業(ye)(ye)(ye)(ye)功(gong)率(lv)(lv)又首要(yao)與(yu)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)管、開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)變(bian)壓(ya)(ya)(ya)器的(de)(de)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)(磁滯(zhi)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)和(he)渦流損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao))有關(guan)(guan)(guan),這兩者的(de)(de)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)均與(yu)頻(pin)(pin)率(lv)(lv)成正比。開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)管的(de)(de)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)首要(yao)由(you)開(kai)(kai)(kai)(kai)(kai)通(tong)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)(導通(tong)時(shi)(shi)刻(ke)(ke)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao))和(he)關(guan)(guan)(guan)斷(duan)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)(關(guan)(guan)(guan)斷(duan)時(shi)(shi)刻(ke)(ke)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao))組成,開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)管的(de)(de)導通(tong)時(shi)(shi)刻(ke)(ke)和(he)關(guan)(guan)(guan)斷(duan)時(shi)(shi)刻(ke)(ke)越(yue)長(chang)(chang),這兩個損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)就越(yue)大(da)。一般大(da)功(gong)率(lv)(lv)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)管的(de)(de)導通(tong)時(shi)(shi)刻(ke)(ke)和(he)關(guan)(guan)(guan)斷(duan)時(shi)(shi)刻(ke)(ke)都比小功(gong)率(lv)(lv)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)管的(de)(de)導通(tong)時(shi)(shi)刻(ke)(ke)和(he)關(guan)(guan)(guan)斷(duan)時(shi)(shi)刻(ke)(ke)長(chang)(chang)許多,所(suo)以大(da)功(gong)率(lv)(lv)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)的(de)(de)作(zuo)業(ye)(ye)(ye)(ye)頻(pin)(pin)率(lv)(lv)一般都獲得(de)比較低(di)。在考慮(lv)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)的(de)(de)作(zuo)業(ye)(ye)(ye)(ye)功(gong)率(lv)(lv)時(shi)(shi),假(jia)如從開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)的(de)(de)體積和(he)本(ben)錢等方面考慮(lv),**選作(zuo)業(ye)(ye)(ye)(ye)功(gong)率(lv)(lv)為(wei)80%左右較為(wei)合(he)適,此刻(ke)(ke),開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)管的(de)(de)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)大(da)約占(zhan)總(zong)(zong)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)的(de)(de)50%,開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)變(bian)壓(ya)(ya)(ya)器的(de)(de)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)大(da)約占(zhan)總(zong)(zong)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)的(de)(de)30%,其他電(dian)(dian)(dian)(dian)路的(de)(de)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)大(da)約占(zhan)總(zong)(zong)損(sun)(sun)(sun)(sun)耗(hao)(hao)(hao)的(de)(de)20%。開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)變(bian)壓(ya)(ya)(ya)器的(de)(de)匝數比與(yu)輸入輸出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)(de)比值有關(guan)(guan)(guan),與(yu)開(kai)(kai)(kai)(kai)(kai)關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)的(de)(de)占(zhan)空(kong)比有關(guan)(guan)(guan)。
18、反(fan)激式變壓器電源輸出側有毛(mao)(mao)刺,且毛(mao)(mao)刺的(de)頻(pin)率和原邊開關頻(pin)率相同(tong),怎樣消除毛(mao)(mao)刺呢?
回答:在次級整流(liu)與濾波電容之間串了(le)一個小(xiao)電感,但電感流(liu)過(guo)直流(liu)時不能飽滿,這種電感的磁回路不能用封閉(bi)式的,必需要留有很大的氣(qi)隙。