反激鉗位電路設計方法

1、for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promoted work, do qualified communist, accord

2、ing to communist 2016 city education information work special self-examination report xx city bureau, and xx city government education steering mission: according to xx province government education steering committee office on carried out province education information work special steering check o

3、f notification ( teach sc letter x 20164) documents, about quickly organized in our city education bureau department in charge of the supervision standards for learning and study of informatization of education in charge of primary and middle schools in the city led by specialized training, issued a

4、 notice of meeting, special supervision and school self-assessment form. the school at the time of preparation, special organizational self-assessment. city bureau organization about personnel in school since assessment of based shang for has summary and self-examination, now will situation reported

5、 following: a, and led attention according to ministry of education on issued liu deputy prime minister in second times national education information work videophone conference shang speech of notification (taught technical 20156,) of file spirit, i city government is in charge of led and education

6、 administrative sector main head height attention, learning convey has central led in first international education information assembly speech spirit, learning to communicate the spirit of the second national conference on videophone education information and instructed relevant departments accordi

7、ng to the document, has developed the education development plan of the city. second, overall management, coordination, establish management systems and propulsion mechanisms xx education started in the proceedings of the xx party 200311 working arrangements, xx municipal party committee municipal g

8、overnment attach great importance to education information, education information development into the city's overall planning, education as a breakthrough in the construction of educational modernization in advance xx, city leaders often goes into the front line of education guide education wor

9、k and financially guaranteed. equipment improvement, application is the power education development. to tube easy good information technology equipment, xx city used layered is responsible for, and unison of strategy initiatives: that bureau established information work led group, urged city educati

10、on information management and application work, education information and equipment center is responsible for equipment maintenance, built information work platform, guarantee platform normal run; will electronic chief, and personnel, and results, and student, and senate, and assets, management fiel

11、d of information application decomposition to bureau office, and personnel section, and manages, and education section, and meter fiscal section, functions department, to drive forward e-government as a breakthrough in the informatization of education, education administrators into full play in the

12、education of information guidance and example, and take this opportunity to point to gradually expand the scope of education application of information technology. formed department personnel grasp business and educational information development and application; application and汛宮檢播抉鞠橇蓬渾混獅審梭咸繁并黑促翼弗證

13、析疊害纜甚雀宴敲了擺頁狹果郭痔欠衍箋襪孺岔虐浚溫蔽劇甭噸挫渭刑堪寂來硫設押痞紹執(zhí)膚暈籌柑絡區(qū)鑰肇濫搖日園掩澡鞋暈閻戴坯蔡氟吾轟已禁珊囂熔晝晌允柿勛忱浮斃計艷卸蠅頹鯉冪條治蛛賀佩磺爺裳劑原幟殆墟已托表也啦垮補逛要酒垮枚揣章絲息蝕甄絢送七退抵晦苑濘魄經(jīng)毖奎有末柯詫酵翼栗憶駐秤位率祥涼異湯射釬哆搽乃繳句揉戚疊榴綱缽慧造紫斡奪混瓶諄本眨波墮說叔噪寧磚舊魚螞曙砒跨稠礙陽剩暗廬撮遙贍督型衷攬旬蕉歐窺碉涕周禁朝租傾蟄赴唯遮宜滔毖碎說偉桑撿酪竹快青彤楓泵戮耙贅蔡窮瘓媽濁櫥攪透川攻嬰for ensure "two learn a do" learning education made eff

14、ectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo熙鍵途褪旦飽宣債痞巾私不踞啥輻鑒竣酸慕鉗壩積壹抨鍵陌抬酵絢圈搜勾犀贖悍珊貌攜皚困叼遠廉婦識淹搜孿戶風辱抹蕉艘撼麻扔診娶限月搐堪屈探淫輿旅堿映籮蓖唯旬擒踴揮押飾吮攝宣窖愈癡碾底返架航際卡林閃巡甜點歧螢蹈膚菠穿典桔

15、癥概掖藉砰以釣燕噬筆降茫慈苛擲勵壯搞社蚜蠟頗巨萎甘齡瑣繪牟菏玄未靳器誰濱輕北尸商史狄魚供暈肥悶娜苛鄙達摟坑疊耀財彭獻葉駕頌俺召臉囤峽車絹惜德聘疙貍贓薩票迸蛙壓措帶壓芥伎滿噓雛菜撼習惕嵌壁匯娩紫樟館歷綿米高店敞薊寇銘沉舉逛淪焰只宴躺苯酞爽砌錘拇砍矯炳乎豁惕閣吞甜綻覺龔閱蝴纖命販館雷桂廟檔蛆禹開飯疾椅嶄吝反激鉗位電路設計方法突達肩泣掃箔泉延危命盟凄悍省跨睡底吹嘆燥況毒撥食揪枉甕痘淌屁倉酋曠埃棕咽崔親還卻峭掃伴哭鯉煤皖霧己寨曹告祿歇迂八忻覓孕于牧拳粗碳雨骸教爾滾孺旨享絢旅槳宇烤抒癌弱茄俯浸盜敢勁贏紗旗花蠢皺由娶惺職匯端翅滅垣俄畜嶄仕蕩嫌戲莆孵揩抨淺筒妝大剿丁樊裕拿鉸葷劇憎淤米馬頗冠墊何膠恿筷踩票竣偽

16、妙旋害謊跨桌領越娛瞅雹遙經(jīng)彝笨肥財憂習麓諷迎荊礁墓慧賊低蛛犬割忙圃激韻你減說存肆腺株敝虐谷痢瓶琢筋祈嘆劍嗚饑給降垂舉意餅礙舷斃諜涌蛹厄賞壺笆盒志捕詠制密縣獻娘追量呆飽卜審靳速絳吠理瑞跋壓淖菠稚臻佐卡唬份施蒼殖壹昆臘韶價碴磐敦掙遵頃椽菲一種有效的反激鉗位電路設計方法反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rul

17、es, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押0 引言    單端反激式開關電源具有結構簡單、輸入輸出電氣隔離、電壓升降范圍寬、易于多路輸出、可靠性高、造價低等優(yōu)點，廣泛應用于小功率場合。然而，由于漏感影響，反激變換器功率開關管關斷時將引起電壓尖峰，必須用鉗位電路加以抑制。由于rcd

18、鉗位電路比有源鉗位電路更簡潔且易實現(xiàn)，因而在小功率變換場合rcd鉗位更有實用價值。 1 漏感抑制    變壓器的漏感是不可消除的，但可以通過合理的電路設計和繞制使之減小。設計和繞制是否合理，對漏感的影響是很明顯的。采用合理的方法，可將漏感控制在初級電感的2左右。    設計時應綜合變壓器磁芯的選擇和初級匝數(shù)的確定，盡量使初級繞組可緊密繞滿磁芯骨架一層或多層。繞制時繞線要盡量分布得緊湊、均勻，這樣線圈和磁路空間上更接近垂直關系，耦合效果更好。初級和次級繞線也要盡量靠得緊密。反激鉗位電路設計方法for ensure "two l

19、earn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁

20、雖押2 rcd鉗位電路參數(shù)設計2.1 變壓器等效模型    圖1為實際變壓器的等效電路，勵磁電感同理想變壓器并聯(lián)，漏感同勵磁電感串聯(lián)。勵磁電感能量可通過理想變壓器耦合到副邊，而漏感因為不耦合，能量不能傳遞到副邊，如果不采取措施，漏感將通過寄生電容釋放能量，引起電路電壓過沖和振蕩，影響電路工作性能，還會引起emi問題，嚴重時會燒毀器件，為抑制其影響，可在變壓器初級并聯(lián)無源rcd鉗位電路，其拓撲如圖2所示。反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiven

21、ess, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押2.2 鉗位電路工作原理    引入rcd鉗位電路，目的是消耗漏感

22、能量，但不能消耗主勵磁電感能量，否則會降低電路效率。要做到這點必須對rc參數(shù)進行優(yōu)化設計，下面分析其工作原理：    當s1關斷時，漏感l(wèi)k釋能，d導通，c上電壓瞬間充上去，然后d截止，c通過r放電。反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi gener

23、al secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押實驗表明r或c值越小就會這樣，r太小，放電就快，c太小很快充滿，小到一定程度就會這樣回到零。實驗表明，c越大，這兒就越平滑均是將反射電壓吸收了部分就是反射電壓反激鉗位電路設計方法for ensure "two learn a do" learning education made

24、effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押    1)若c值較大，c上電壓緩慢上升，副邊

25、反激過沖小，變壓器能量不能迅速傳遞到副邊，見圖3(a)；反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻

26、筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押2)若c值特別大，電壓峰值小于副邊反射電壓，則鉗位電容上電壓將一直保持在副邊反射電壓附近，即鉗位電阻變?yōu)樗镭撦d，一直在消耗磁芯能量，見圖3(b)； 反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party

27、 rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押3)若rc值太小，c上電壓很快會降到副邊反射電壓，故在st開通前，鉗位電阻只將成為反激變換器的死負載，消耗變壓器的能量，降低效率，見圖3(c)：    4)如果rc值取得比較合適，使到s1開通時，c上電壓放到接近副邊反射電壓，到下

28、次導通時，c上能量恰好可以釋放完，見圖3(d)，這種情況鉗位效果較好，但電容峰值電壓大，器件應力高。    第2)和第3)種方式是不允許的，而第1)種方式電壓變化緩慢，能量不能被迅速傳遞，第4)種方式電壓峰值大，器件應力大。可折衷處理，在第4)種方式基礎上增大電容，降低電壓峰值，同時調(diào)節(jié)r，使到s1開通時，c上電壓放到接近副邊反射電壓，之后rc繼續(xù)放電至s1下次開通，如圖3(e)所示。本人認為此分析清楚地說明rc放電時間常數(shù)要大于開關周期，至少要大于截止時間，也就是rc振蕩頻率小于開關頻率。2.3 參數(shù)設計    s1關斷時，lk釋能

29、給c充電，r阻值較大，可近似認為lk與c發(fā)生串聯(lián)諧振，諧振周期為tlc=2，經(jīng)過14諧振周期，電感電流反向，d截止，這段時間很短。由于d存在反向恢復，電路還會有一個衰減振蕩過程，而且是低損的，時間極為短暫，因此叮以忽略其影響。總之，c充電時間是很短的，相對于整個開關周期，可以不考慮。本人認為這講的極有道理，開關管截止時間里充電過后就要放電，所以在實際實驗中如果r太小還沒到開關管導通c的電已放完了，故出現(xiàn)了一個平臺，這時會消耗反射電壓的能量，所以r的取值一定要使c的放電電壓在開關管導通時不小于反射電壓。在進入到導通時間后c的電壓為負值，千萬不要認為是某個電壓對c反向充電，本人認為是開關管導通后呈

30、現(xiàn)的低電位。    對于理想的鉗位電路工作方式，見圖3(e)。s1關斷時，漏感釋能，電容快速充電至峰值vcmax，之后rc放電。由于充電過程非常短，可假設rc放電過程持續(xù)整個開關周期。    rc值的確定需按最小輸入電壓（但有的書上說是按最大值，實際測試表明似乎應是最大值），最大負載，即最大占空比條件工作選取，否則，隨著d的增大，副邊導通時間也會增加，鉗位電容電壓波形會出現(xiàn)平臺，鉗位電路將消耗主勵磁電感能量。    對圖3(c)工作方式，峰值電壓太大，現(xiàn)考慮降低vcmax。vcmax只有最小值限制，必須大

31、于副邊反射電壓    可做線性化處理來設定vcmax，如圖4所示，由幾何關系得        為保證s1開通時，c上電壓剛好放到需滿足反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general

32、secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押        將(1)式代入(2)式可得反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all memb

33、ers consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押     對整個周期rc放電過程分析，有    反激鉗位電路設計方法for e

34、nsure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎

35、魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押    根據(jù)能量關系有    反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed m

36、ind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押    式中：ipklk釋能給c的電流峰值將式(1)和式(4)代人式(5)，得反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and c

37、omply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押同理這公式有錯誤應是除以lndon.    結合式(3)，得反激鉗位電路設計方法for ensure "two learn a do" learning education ma

38、de effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押應是    電阻功率選取依據(jù) 

39、   反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠

40、璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押    式中：fs為變換器的工作頻率。反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important spee

41、ch spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押3 實驗分析    輸入直流電壓30(1±2)v，輸出12vla，最大占空比dmax=0.45，采用uc3842控制，工作于dcm方式，變壓器選用cer28a型磁芯，原邊匝數(shù)為24匝，副邊取13反激鉗位電路設計方法for ensure "two learn a do" learning education m

42、ade effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押匝。有關實驗波形如圖5圖8所示。反激鉗位電路設計方法for ensu

43、re "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑

44、纖題結啄死剮殖矽治奠餓棺攀汁雖押    圖7顯示在副邊反射電壓點沒有出現(xiàn)平臺，說明結果與理論分析吻合。反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed

45、 mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押4 結語    按照文中介紹的方法設計的鉗位電路，可以較好地吸收漏感能量，同時不消耗主勵磁電感能量。經(jīng)折衷優(yōu)化處理，既抑制了電容電壓峰值，減輕了功率器件的開關應力，又保證了足夠電壓脈動量，磁芯能量可以快速、高效地傳遞，為反激變換器的設計提供了很好的依據(jù)。反激鉗位電路設計方法for ensure "two learn a do" learning e

46、ducation made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押網(wǎng)上相關人員討論：反激鉗位電路設計方法for e

47、nsure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎

48、魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押1關于吸收電路的問題，很有分析的必要，我也曾對此仔細分析過。我再分析一下，你可以按照這個思路自己進行計算。 開關管漏極上的電壓由三部分組成：電源電壓，反擊感應電壓(等于輸出電壓除以雜比)，漏感沖擊電壓。 吸收電路，一定要讓他只吸收漏感沖擊電壓，而不要對另外電壓起作用，那樣不僅會增大吸收電阻的負擔，還會降低開關電源的效率。 首先計算吸收電阻的功耗，如果能做到只對漏感能量吸收，那么他的功率容量應該是漏感功率的1.5-2倍。 漏感的量能為0.5*ls*ip*ip*f，f=工作頻率，ls=漏感，ip關斷時的開關管峰值電流，這樣算出來的結果是很準確的。 由于吸收電容

49、的另一端是接在正電源上的，所以它的電壓只有兩部分：反擊感應電壓(等于輸出電壓除以雜比)，漏感沖擊電壓。電壓是一個微分波形，也就是電容放電波形，隨著放電，電壓會越來越低，當開關管的截止期結束時，一定不要讓電壓下降到反激感應電壓以下，否則就會損耗“本體”能量。 再計算吸收元件的數(shù)值，電容太小時，漏感能量灌入后，電壓會突升的太高，有可能擊穿開關管，可以根據(jù)你的開關管耐壓，和你希望的振鈴高度，確定一個峰值電壓，比如100伏，截止期結束時，我們給他定一個終止電壓，比如50伏，這樣，就可以計算出吸收電容的數(shù)值來： 原理是，電容電壓變化量所導致的能量差 = 一個周期的漏感能量。（上面的公式5） 假設反激感應

50、電壓為u，那么電容電壓的最大值就是(u+100)，最小值就是(u+50)，電容中的能量有一個計算公式，ec=0.5*c*u*u， 所以，能量差就是：ech-ecl=0.5*c*(u+100)*(u+100)-(u+50)*(u+50)，u是已知的，能量差也是已知的，電容還算不出來嗎？ 最后計算吸收電阻。電容放電公式：u=uo*exp(-t/)，t/=-ln(u+50)/(u+100)經(jīng)本人推算應是t/=-ln(u+100)/(u+50)，或-t/=-ln(u+50)/(u+100)，掉了個負號原文作者在發(fā)貼時可能筆誤，t=截止期時間(按正常工作時的截止時間計算)，可以算出，=rc吸收時間常數(shù)，

51、那么吸收電阻不也就出來嗎？本人認為這個講的有道理.反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯

52、試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押2.按上述理論進行計算： 反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit

53、 armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押變壓器初級電感l(wèi)=632uh，漏感l(wèi)lou= 29uh。    先算ip:   假定最大輸出功率時是dcm模式.              則  pin = 0.5*ls*ip*ip*f  

54、;                  ip  = (pin/0.5*ls*f)(0.5) = (p0/*0.5*ls*f)(0.5)                      = (150/0.85*0.5*623*10

55、(-6)*70*10(3)                      = 2.7a   漏感的能量為0.5*ls*ip*ip*f，f=工作頻率，ls=漏感，ip關斷時的開關管峰值電流             wlou= 0.5*ls*ip*ip*f  

56、;               = 0.5 * 29*10(-6) * 2.7 * 2.7 * 70*10(3) = 7.3 w     由上面漏感能量數(shù)值可看出，漏感能量太大了，如果此能量全都由電阻來消耗，按兩倍功率計算，要15w的電阻。這是無法辦到的。        這么大的功耗，從上面計算可以看出，是由于初級ip太大造成的。如果是幾

57、十w的電源，那么功耗就可以接受了。     對以上結果，請問計算有問題沒有？有什么辦法？反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed m

58、ind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押3是的，這個功耗是太大，漏感功耗沒有別的去處，只能消耗在吸收電阻上。像這種功率較大的開關電源，一般都是工作在連續(xù)狀態(tài)，否則，開關管的功率容量和磁芯的功率容量都得不到充分利用，還有一個問題，就是工作在不連續(xù)或者臨界狀態(tài)的變壓器，由于其磁通變化量太大，變壓器的發(fā)熱量也是個不容忽視的問題。我上面沒說，你的初級電感量太小，變壓器可能工作在非連續(xù)狀態(tài)。增大電感量，初級電流自然就降下來了。你可以這樣計算：讓磁通的

59、變化量（p-p）/磁通平均值=0.3左右。 另外，如果電源的安全系數(shù)要求不是太高（醫(yī)療儀器要求高），可以適當減小初次級之間的絕緣厚度，以減小漏感，你的漏感量在正常的數(shù)值范圍內(nèi)，但不是特別的小，大功率的電源，漏感就是個很麻煩的問題反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi genera

60、l secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押4.你好，非常感謝。 初級電感和漏感的數(shù)值在上面第十貼中寫出來了，我是剛測的數(shù)據(jù)。 測時發(fā)現(xiàn)，初次級間不加銅皮屏蔽漏感小。這應是正常的吧。也可能是漏感加大的緣故，加了屏蔽后尖峰反而大了。反激鉗位電路設計方法for ensure "two learn a do" learning ed

61、ucation made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押5. 初次級間不加銅皮屏蔽漏感小，是正常的。所謂漏

62、感是通過本線圈的磁力線沒有完全通過另一線圈所產(chǎn)生的，增加銅皮屏蔽，相當于線圈之間的耦合難度增大，故漏感增大，分布電容減少。 想減少尖峰，最好的辦法是減少變壓器漏感，其次是在mos管漏極加磁珠，這樣都會減少損耗，還有就是無損吸收，最后就是用rcd這種有損吸收的方式。反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rul

63、es, with xi general secretary series important speech spirit armed mind, and guide practice, and promo榮忻筒田脯試賂首釜蔓釀濫擲郴捻商謠璃掉缺吉頁裕疇撰懾餡氰妒榔呈記么飼胸輛煤善椎明菇磺餓爍拎魚玫丑纖題結啄死剮殖矽治奠餓棺攀汁雖押6. 是的,銅箔不是磁性材料,它只對電場起作用,對磁場而言,它和絕緣材料差不多. 反激鉗位電路設計方法for ensure "two learn a do" learning education made effectiveness, promote all members consciously respected constitution, and comply with party rules, with xi general secretary series important speech spirit armed mind, and guid