Forward and Flyback (Converters with isolation)

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Mavis Lawrence
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1 Prf.. Be-Yaakv, - verers [4- ] Frward ad Flyback (verers wih islai) 4. Trasfer f curre via rasfrmer 4. Frward 4.. lage rasfer fuci 4.. Mageizai iducace prblem 4..3 Trasfrmer rese 4..4 ese f frward 4.3 upled iducrs 4.4 Flyback 4.4. lage rasfer fuci 4.4. Flyback wih muliple upus haracerisics f Flyback Prf.. Be-Yaakv, - verers [4- ] Is rasfer f curre pssible? : I s s I i

.3 Trasfrmer rese 4..4 ese f frward 4.3 upled iducrs 4.4 Flyback 4.4. lage rasfer fuci 4.4. Flyback wih muliple upus 4.

2 Prf.. Be-Yaakv, - verers [4-3] eplacig by a ide : I Prf.. Be-Yaakv, - verers [4-4] Frward verer : I I I T Frward : T is a rasfrmer Oupu seci: Buck Buck derived

3 Prf.. Be-Yaakv, - verers [4-5] lage rasfer fuci : X I I ON ON A seady sae, ver e swichig cycle: = 0; ( + i ( ) ) ; ; I X T s + + = 0 = i Prf.. Be-Yaakv, - verers [4-6] Mageizai Iducace Prblem : m ideal m?

4 Prf.. Be-Yaakv, - verers [4-7] Trasfrmer ese m rese ) ( rese i i = ( rese i ) Prf.. Be-Yaakv, - verers [4-8] Applyig a ese Widig ON I OFF 3 rese m rese ese equiremes rese 3 i

5 Prf.. Be-Yaakv, - verers [4-9] Applyig same surce 3 rese i 3 > i 3 < Prf.. Be-Yaakv, - verers [4-0] Assigme 3 rese Give: 0.< <0.7 Wha will be he vlage sress?

6 Prf.. Be-Yaakv, - verers [4- ] ese f Frward 3 I I I 3 alculai f 3 alculai ca be de by lkig a ay f he widigs,, 3 Prf.. Be-Yaakv, - verers [4- ] Fudameal requireme: m 3 I m = i 3 v widig = Example: kig a I m

7 Prf.. Be-Yaakv, - verers [4-3] T I m = i 3 i 3 3 i I m 3 Prf.. Be-Yaakv, - verers [4-4] T lage swich whe s = i + 3 i s = i [+ max max ] i 3

8 Prf.. Be-Yaakv, - verers [4-5] I I ese widig I I 3 I wich urre 3 = primary curre is a refleci f I plus I m I I T I pk I pk Ipk Prf.. Be-Yaakv, - verers [4-6] Takig i accu m I I m 3 m I m I 3 I I +I m

9 Prf.. Be-Yaakv, - verers [4-7] 3 = ese urre rese = i 3 = i Quesi : Hw des I 3 lk? I 3 I pk? Quesi : If max =0.3 T. alculae / 3. Fid maximum vlage swich Prf.. Be-Yaakv, - verers [4-8] upled iducr =

10 Prf.. Be-Yaakv, - verers [4-9] urre i a Widig AN be Ierruped! : I I Prf.. Be-Yaakv, - verers [4-0] Eergy sred i cre ( i wires) : I I I I I pk I pk A rasii I pk N I = I pk pk = N I pk

11 Prf.. Be-Yaakv, - verers [4- ] upled widigs : I I Prblem: eakage iducace (will be discussed laer) I pk I pk = I Ipk = pk I I I pk I pk Prf.. Be-Yaakv, - verers [4- ] ide replace a swich : = = (egaive vlage) : 0 :

12 Prf.. Be-Yaakv, - verers [4-3] Buck Bs Plariy eversal i + = 0 i = Prf.. Be-Yaakv, - verers [4-4] Flyback Buck Bs Islaed Back-Bs Flyback

13 Prf.. Be-Yaakv, - verers [4-5] Flyback cverer : : : I Prf.. Be-Yaakv, - verers [4-6] lage rasfer fuci The average vlage mehd : lage acrss primary - i i = = T s = i

14 Prf.. Be-Yaakv, - verers [4-7] lage rasfer fuci The I mehd I I T s i I = I = ; I I I I i = = i = = i Prf.. Be-Yaakv, - verers [4-8] Flyback wih muliple upus

15 Prf.. Be-Yaakv, - verers [4-9] Flyback = Prf.. Be-Yaakv, - verers [4-30] haracerisics f Flyback Islai ep-up r ep-dw isciuus curre a ipu ad upu (Buck-Bs erived) Muliple upus (ecmical)

16 Prf.. Be-Yaakv, - verers [4-3] Exercise 0meg 4 u break {i} {} drai {*(*)} u_gd 0u I = 6 {ad} = 0 = 5 T = 0 T = 0.0u TF = 0.0u PW = 0u PE = 0u 0 gae break 0 K K K_iear OUPING = = l = l PAAMETE: = 0.5 i = = 300u ad = 0 Fid by simulai lkg ad m f he mageic bdy if k=.9 alculae Ap f mageic eleme

0u PW = 0u PE = 0u 0 gae 0 + - + - break 0 K K K_iear OUPING = = l = l

Diode Circuits or Uncontrolled Rectifier

Diode Circuits or Uncontrolled Rectifier EE 45- Elecric Drives Chaper Dr. Ali M. Elaaly Dide Circuis r Ucrlled ecifier. rduci Because f heir abiliy cduc curre i e direci, dides are used i recifier circuis. The defiii f recificai prcess is he