電源拓?fù)浣Y(jié)構(gòu)詳述-資料下載頁(yè)
2025-08-05 10:13本頁(yè)面
【正文】 在本例中， Vin = 5, Vout = 15, and D = 2/3. Vout = 15， D = 2/3. ti m ei 200i 1i30v 1i 1L o a d(R )Vo u t = 1 5 Vi3i 2v 1Vi n =5 VVi n = 5 VVo u t = 1 5 V0?????? ?? D1 1V inVo負(fù)載 時(shí)間 Transformer Operation 變壓器工作 Including Effect of Primary Inductance 包括初級(jí)電感的作用 Transformer is shown as an ideal transformer, with its primary (magizing) inductance as an inductor in parallel with the primary. 變壓器看作理想變壓器 ， 它的初級(jí)（磁化 ） 電感與初級(jí)并聯(lián) 。 L o a d (R )i1i2t u r n s r at io :1 : 2v 0ti m e0ii 0i10v s e c .i s e c . 00v s e c .i s e c .i2負(fù)載 匝數(shù)比： 時(shí)間 Flyback Transformer 反激變壓器 (Really a MultiWinding Inductor) （ 實(shí)際是多繞組電感 ） Here, the primary inductance is intentionally low, to determine the peak current and hence the stored energy. When the primary switch is turned off, the energy is delivered to the secondary. 此處初級(jí)電感很低 ， 用于確定峰值電流和存儲(chǔ)的能量 。 當(dāng)初級(jí)開(kāi)關(guān)斷開(kāi)時(shí)，能量傳送到次級(jí)。 t u r n s r at io :1 : 2v p r i . 0i p r i . 0v s e c .i s e c . 00v s e c .i s e c .L o a d (R )ti m eVi nv d r a i n0Vo u tVo u ti p r i .v p r i .負(fù)載 匝數(shù)比： 時(shí)間 Forward Converter Transformer 正激變換變壓器 i1i2t u r n s r a t io :1 : 2v p r i . 0i p r i . 00v s e c .i s e c . 00v s e c .i s e c .i2L o a d (R )ti m eVi nv d r a i n0Vo u tVo u tiR E S E T0i3i31i p r i .00iR E S E T0i1v n o d ePrimary inductance is high, as there is no need for energy storage. 初級(jí)電感很高，因?yàn)闊o(wú)需存儲(chǔ)能量 。 Magizing current (i1) flows in the “magizing inductance” and causes core reset (voltage reversal) after primary switch turns off. 磁化電流 (i1) 流入 “磁化電感 ”， 使磁芯在初級(jí)開(kāi)關(guān)斷開(kāi)后去磁 (電壓反向 )。 負(fù)載 匝數(shù)比： 時(shí)間 Summary 總結(jié) This has been a review of the most popular circuit topologies used in today’s switchedmode power conversion. 此處回顧了目前開(kāi)關(guān)式電源轉(zhuǎn)換中最常見(jiàn)的電路拓?fù)浣Y(jié)構(gòu) 。 There are many more topologies, but most are binations or variations of the ones presented here. 還有許多拓?fù)浣Y(jié)構(gòu)，但大多是此處所述拓?fù)涞慕M合或變形 。 Each topology contains a unique set of design tradeoffs: 每種拓?fù)浣Y(jié)構(gòu)包含獨(dú)特的設(shè)計(jì)權(quán)衡 ： – Voltage stress on the switches 施加在開(kāi)關(guān)上的電壓 – Chopped vs. smooth input and output currents 斬波和平滑輸入輸出電流 – Utilization of the transformer windings 繞組的利用率 Choosing the best topology requires a study of: 選擇最佳的拓?fù)浣Y(jié)構(gòu)需要研究 ： – Input and output voltage ranges 輸入和輸出電壓范圍 – Current ranges 電流范圍 – Cost vs. performance, size and weight 成本和性能、大小和重量之比
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