ActCl.pdf part of СХЕМИ_НА_КОМПЮТЪРНИ_ЗАХРАНВАНИЯ.part1.rar, SHEMI NA KOMPUTARNI ZAXRANVANIYA PSU text manual preview

Text preview for : ActCl.pdf part of SHEMI NA KOMPUTARNI ZAXRANVANIYA PSU

Back to : СХЕМИ_НА_КОМПЮТЪРНИ_ЗАХРА | Home

DC-DC

1.
1978., 90- . . -, , SMD- , , . -, MOSFET-. , - 500 , 90- , . , , . , (forward ), (Flyback). , , , . 1 2 .

. 1

. 2

. , . C3. . Q1 Q2 . , Vcl: :

Vcl = Vin

D (1) (1 - D)

:

Vcl = Vin

V *D 1 = in + Vin (1b) (1 - D) (1 - D)

D - ton/T.

" DC-DC "

. 1 13

C3 1 , , Vin - "" - .

:

· · · · · · · · ·

, .. - . , , - - , , , , - , . , ""

, , . , , , . , / - , , . , (, ). , , . . . - . , "" , . , . . 36-75VDC P-channel , . , PWM . . , SMPS , . - , . , ( ). , 1-2-3 , . - , . , , ZVS, , . , , , . , .

" DC-DC "

. 2 13

. DC 0.5 (RC) C

0.5

>0.5

>0.5

, . , Vin. . (, ) , . , , , P-channel , ( -200) . , , , . DC-DC , .

" DC-DC "

. 3 13

TI SEM1100 (1996.) Design
Technique Considerations for Active Clamp and Reset

. 3 . . Lm Li, , . , " " Li. D1 D2 , Q1 Q2. Q1 Q2, , , .

Vin
i cl

i1

LI
im

ip

C cl D2 + C in Q2 Q1

Lm

N

A D1 CA

. 3 . . 4 .

VgsQ1

VgsQ2 VIN +VCR VdsQ1

i1
-IR IM

im
-IR IM

i cl
-IR t0 t1 t2 t3 t4 t5 t6 t7 t8

. 4 " DC-DC " . 4 13

1: [t0-t1] (Q1) . ( Vcl) (Q2/D2). , . , . 2: [t1-t3] , , (Iop) (Im). , , , Vin. :

t 2 -1 =

CA * Vin ( I op + I m )

(2)

. , (Lm+Li) . Vin+Vcl, D2. :

V sin -1 cl I Z m c t 3- 2 = (L m + Li ) CA 1 ( L m + L i ) * CA

(3)

Zc = =

(4)

(5)

Vcl Vin ( 1), . t2-1 t3-2 td1(min), Q1 D2. D2, Q2 . , Q2 Q1 Q2 (t2-1+t3-2) . D2 , , Q2 Ccl. , Q1 Q2. , , td1(max) = T*(1-Dmax)/2. , td1(min) td1(max), . 3: [t3-t5] (D2/Q2/Ccl) , . D2 , . . , Q2 . , Q2 , / , . , , , , .

" DC-DC "

. 5 13

, Ccl , . , 1(), Vcl , Ccl, . , Vcl . , Vcl , (Vin+Vcl) , . , , Vcl . , Lm Ccl. Lm :

I m( rev ) =
:

Vcl Z ca cos()

(6)

Z ca =

Lm C cl

(7)

Z I = tan -1 - ca m Vcl

(8)

Im - . ( ) :

Vrip =

Vcl - Vcl cos()

(9)

Ccl Im(rev), Vrip. , , Ccl , 10-15% Vin max. , , 10nF 100-150. 4: [t5-t8] Q2 , (-Im) VCA=Vin+Vcl. Q2 , .5.

Im(0) = Im VCA(0) = Vin+Vcl

. 5 " DC-DC " . 6 13

, VCA Vin. :

VCA = Vin + Vcl i m = Vcl
:

cos( + t ) cos()

(10)

sin( + t ) Z c cos()

(11)

Z I = tan -1 c m V cl - 2

(12)

VCA Vin t:

t 6-5 =

(13)

:

I MA =

Vcl Z c cos

(14)

Vin, . . . , IMA , Vin. ( ) . , , . , . , . , . Vin , . , , . , . , , . ZVS, , . , ZVS, . . , ZVS, . t6 Li il=IMA VCA=Vin. , :

VCA = Vin - I MA Z c2 sin( 2 t ) i l = - I MA cos(2 t )

(15) (16)

" DC-DC "

. 7 13

Z c2 = 2 =

Ll CA I L l * CA

(17)

(18)

, VCA , IMA*Zc2 , Vin. Vin , . , , :

t 7- 6 =

Vin 1 sin -1 I 2 MA Z c2

(19)

, , , . , ( ), , . , , ZVS Ll. , . , , Vin, :

E dis =

2 C x Vx Vin1,5 3

(20)

Cx Vx Vin - . 25V. , , t6, , Edis , . , Ll, :

E leak =

1 L l I MA 2 2

(21)

15-18 , ZVS , 20% . 20 21, ZVS 5% . , ZVS. :

1 2 C eq Vin 2 = E dis = C x Vx Vin1,5 (22) 2 3
Ceq 17-18. 19 t6-7, Ceq Vin .

" DC-DC "

. 8 13

, . , , . 1a 1b, , . ( Vcl ) ( Vin) . . . 6 , .

. 6 , ( Q1) - Q3 Vin/K. L1 "" , - Q4 , .. Vcl/K. , Q3 :
Vmin = Vin(min)/K Vmax = Vin(max)/K

(23a) (23b)

- Q4:

Vmin Vmax

=

Vin(max) · Dmin /K 1- Dmin Vin(min) · Dmax /K 1- Dmax

(24a)

=

(24b)

Vin(max)/Vin(min) Kv, (23a) (24a) (23b) (24b) , D, - :
Dmin = Dmax = 1 1 + Kv Kv 1 + Kv

(25a)

(25b)

" DC-DC "

. 9 13

, : Vpri(max) = Vin(min)*(1+Kv) (26)

. (24b) (26), (, D). D. , (UVLO). , . . , , . , , , UVLO, Vcl . . 36-75VDC. Kv = 2 ( , ), 108V 36 72 . 150- . 32 128, , 30 - 150. , , 150 120 , . , D, . ( , ), :

N=

D max · ( Vout + Vr ) Vin (min)

(27)

Vr - . N , Dmax , , . ( ) N . (23) (24), . 5 Kv = 2 , (, Kv = 2 UVLO) - Q4 . , . . 7. D1 ( 10), - Q1 R1R2 (R2>>R1), . , 5...25 .

. 7 , - .

" DC-DC "

. 10 13

. Texas Instruments UCC3580, . , ( TI $2.1 ), "" , , Dmax 0.66, . -channel , N- , . , UCC3580 . 1. . , . , SMD . , PE-68386 Pulse Eng. 8.6*6.7*2.5 $1 1000. . 8

. 8 U1 ( RCD ) . 4 D3 D . D3 , D (, ) Q2. UCC3580 , (. Data Sheet UCC3580). 2. ( , ), , International Rectifier. , . IR2113, . . 9 "" .

" DC-DC "

. 11 13

. 9 , Q1. 3 D3 (Vcc) Q1 ( ). , , , PWM D , . Q1 , Vcc 3 . 3 . , , , Q1. , , , . , , . 3. P-channel , . 2 - . , , , -channel MOSFET , 400. DC-DC . , 36-75VDC International Rectifier 150- -channel SO-8 (, IRF6216). UCC3580 channel .

" DC-DC "

. 12 13

-channel . 10.

. 10 , RCD . 3 D3 . , . , , , . , ( , - ). . , 20-60% . "" . ( DC-DC ) , . , ZVS, , - , . 100-130 . , , . , , .

. . , , . - , .

" DC-DC "

. 13 13